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various screws updates

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Adrian Mariano 2022-08-25 21:12:57 -04:00
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screws.scad
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@ -3,7 +3,7 @@
// Functions and modules for creating metric (ISO) and English (UTS) standard screws and nuts. // Functions and modules for creating metric (ISO) and English (UTS) standard screws and nuts.
// Included is a function for calculating the standard dimensions of screws including the // Included is a function for calculating the standard dimensions of screws including the
// tolerance values that are required to make screws mate properly when they are formed // tolerance values that are required to make screws mate properly when they are formed
// precisely, so if you can fabricate objects accurately then your screws will mate // precisely. If you can fabricate objects accurately then the modeled screws will mate
// with standard hardware without the need to introduce extra gaps for clearance. // with standard hardware without the need to introduce extra gaps for clearance.
// Includes: // Includes:
// include <BOSL2/std.scad> // include <BOSL2/std.scad>
@ -12,10 +12,9 @@
// FileSummary: ISO (metric) and UTS screws and nuts. // FileSummary: ISO (metric) and UTS screws and nuts.
////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////
include <structs.scad> include <BOSL2/structs.scad>
include <threading.scad> include <BOSL2/threading.scad>
include <screw_drive.scad> include <BOSL2/screw_drive.scad>
// Section: Screw Parameters // Section: Screw Parameters
// This modules in this file create standard ISO (metric) and UTS (English) threaded screws. // This modules in this file create standard ISO (metric) and UTS (English) threaded screws.
@ -25,18 +24,18 @@ include <screw_drive.scad>
// various head types and drive types that should match standard hardware. // various head types and drive types that should match standard hardware.
// Subsection: Screw Naming // Subsection: Screw Naming
// You can specify screws using a string that names the screw. // You can specify screws using a string that names the screw.
// For ISO (metric) screws the name has the form: `"M<size>x<pitch>,<length>"`, // For ISO (metric) screws the name has the form: "M`<size>`x`<pitch>`,`<length>`,
// so `"M6x1,10"` specifies a 6mm diameter screw with a thread pitch of 1mm and length of 10mm. // so "M6x1,10" specifies a 6mm diameter screw with a thread pitch of 1mm and length of 10mm.
// You can omit the pitch or length, e.g. `"M6x1"`, or `"M6,10"`, or just `"M6"`. // You can omit the pitch or length, e.g. "M6x1", or "M6,10", or just "M6".
// . // .
// For UTS (English) screws the name has the form `"<size>-<threadcount>,<length>"`, e.g. // For UTS (English) screws the name has the form `<size>`-`<threadcount>`,`<length>`, e.g.
// `"#8-32,1/2"`, or `"1/4-20,1"`. The units are in inches, including the length. Size can be a // "#8-32,1/2", or "1/4-20,1". The units are in inches, including the length. Size can be a
// number from 0 to 12 with or without a leading `#` to specify a screw gauge size, or any other // number from 0 to 12 with or without a leading # to specify a screw gauge size, or any other
// value to specify a diameter in inches, either as a float or a fraction, so `"0.5-13"` and // value to specify a diameter in inches, either as a float or a fraction, so "0.5-13" and
// `"1/2-13"` are equivalent. To force interpretation of the value as inches add `''` (two // "1/2-13" are equivalent. To force interpretation of the value as inches add '' (two
// single-quotes) to the end, e.g. `"1''-4"` is a one inch screw and `"1-80"` is a very small // single-quotes) to the end, e.g. "1''-4" is a one inch screw and "1-80" is a very small
// 1-gauge screw. The pitch is specified using a thread count, the number of threads per inch. // 1-gauge screw. The pitch is specified using a thread count, the number of threads per inch.
// As with the ISO screws, you can omit the pitch or length and specify `"#6-32"`, `"#6,3/4"`, or simply `#6`. // As with the ISO screws, you can omit the pitch or length and specify "#6-32", "#6,3/4", or simply #6.
// Subsection: Standard Screw Pitch // Subsection: Standard Screw Pitch
// If you omit the pitch when specifying a screw or nut then the library supplies a standard screw pitch based // If you omit the pitch when specifying a screw or nut then the library supplies a standard screw pitch based
// on the screw diameter. For each screw diameter, multiple standard pitches are possible. // on the screw diameter. For each screw diameter, multiple standard pitches are possible.
@ -85,23 +84,24 @@ include <screw_drive.scad>
// | |X|"flat small" | slot, phillips| // | |X|"flat small" | slot, phillips|
// | |X|"flat large" | hex, torx | // | |X|"flat large" | hex, torx |
// | |X|"flat undercut" | slot, phillips | // | |X|"flat undercut" | slot, phillips |
// |X| |"pan" | slot, phillips | // |X|X|"pan" | slot, phillips, torx (ISO only) |
// |X| |"cheese" | slot, phillips | // |X| |"cheese" | slot, phillips, torx |
// . // .
// The drive size is specified appropriately to the drive type: drive number for phillips or torx, // The drive size is specified appropriately for the drive type: drive number for phillips or torx,
// and allen width in mm or inches (as appropriate) for hex. Drive size is determined automatically // and recess width in mm or inches (as appropriate) for hex. Drive size is determined automatically
// from the screw size, but by passing the `drive_size=` argument you can override the default, or // from the screw size, but by passing the `drive_size=` argument you can override the default, or
// in cases where no default exists you can specify it. // in cases where no default exists you can specify it.
// Subsection: Tolerance // Subsection: Tolerance
// Without tolerance requirements, screws would not fit together. The screw standards specify a // Without tolerance requirements, screws would not fit together. The screw standards specify a
// nominal size, but the tolerance determines a range of allowed sizes based on that nominal size. // nominal size, but the tolerance determines a range of allowed sizes based on that nominal size.
// So for example, an M10 screw with the default tolerance has an outside (major) diameter between 9.74 mm and 9.97 mm. // So for example, an M10 screw with the default tolerance has an outside (major) diameter between 9.74 mm and 9.97 mm.
// The librasry will use the center point in the allowed range and create a screw with a diameter of 9.86 mm. // The library will use the center point in the allowed range and create a screw with a diameter of 9.86 mm.
// A M10 nut at the default tolerance has a major diameter (which is the inside diameter) between 10 mm and 10.4 mm. // A M10 nut at the default tolerance has a major diameter (which is the inside diameter) between 10 mm and 10.4 mm.
// Shrinking the major diameter of a screw makes the screw loose. Shrinking the major diameter of a nut, on the other hand, // Shrinking the major diameter of a screw makes the screw loose. Shrinking the major diameter of a nut, on the other hand,
// makes the hole smaller and hence makes the nut tighter. For this reason, we need a difference tolerance // makes the hole smaller and hence makes the nut tighter. For this reason, we need a difference tolerance
// for a screw than for a nut. Screw tolerances Screws modeled by this method will have dimensions consistent with the // for a screw than for a nut. Screw tolerances shrink the diameter to make the screw looser whereas nut tolerances
// standards they are based on, so that they would interface properly if fabricated by an accurate method. The ISO and UTS // increase the diameter to make the nut looser. Screws modeled using this library will have dimensions consistent with the
// standards they are based on, so that they will interface properly if fabricated by an accurate method. The ISO and UTS
// systems use different tolerance designations. // systems use different tolerance designations.
// . // .
// For UTS screw threads the tolerance is one of "1A", "2A" or "3A", in // For UTS screw threads the tolerance is one of "1A", "2A" or "3A", in
@ -112,22 +112,18 @@ include <screw_drive.scad>
// order of increasing tightness. The default tolerance is "2B", which // order of increasing tightness. The default tolerance is "2B", which
// is the general standard for manufactured nuts. // is the general standard for manufactured nuts.
// . // .
// For ISO the tolerance // The ISO tolerances are more complicated. For both screws and nuts the ISO tolerance has the form of a number
// has the form of a number and letter. The letter specifies the "fundamental deviation", // and letter. The letter specifies the "fundamental deviation", also called the "tolerance position", the gap
// also called the "tolerance position", the gap // from the nominal size. The number specifies the allowed range (variability) of the thread heights. For
// from the nominal size, and must be "e", "f", "g", or "h", where "e" is // screws, the letter must be "e", "f", "g", or "h", where "e" is the loosest and "h" means no gap. The number
// the loosest and "h" means no gap. The number specifies the allowed // for a screw tolerance must be a value from 3-9 for crest diameter and one of 4, 6, or 8 for pitch diameter.
// range (variability) of the thread heights. It must be a value from // A tolerance "6g" specifies both pitch and crest diameter to be the same, but they can be different, with a
// 3-9 for crest diameter and one of 4, 6, or 8 for pitch diameter. A // tolerance like "5g6g" specifies a pitch diameter tolerance of "5g" and a crest diameter tolerance of "6g".
// tolerance "6g" specifies both pitch and crest diameter to be the same, // Smaller numbers give a tighter tolerance. The default ISO screw tolerance is "6g".
// but they can be different, with a tolerance like "5g6g" specifies a pitch diameter
// tolerance of "5g" and a crest diameter tolerance of "6g".
// Smaller numbers give a tighter tolerance. The default ISO tolerance is "6g".
// . // .
// For ISO nuts the form is the same, but the number specifying the variability must range from 4-8, // For ISO nuts the letters specifying the fundamental deviation are upper case and must be "G" or "H" where "G"
// and the fundamental deviation letter must be "G" or "H" where "G" is loose and "H" means // is loose and "H" means no gap. The number specifying the variability must range from 4-8. An allowed (loose)
// no gap. An allowed (loose) nut tolerance is "7G". The default ISO tolerance is "6H". // nut tolerance is "7G". The default ISO tolerance is "6H".
// Section: Making Screws // Section: Making Screws
@ -154,10 +150,12 @@ Torx values: https://www.stanleyengineeredfastening.com/-/media/web/sef/resourc
// Create a screw. See [screw parameters](#section-screw-parameters) for details on the parameters that define a screw. // Create a screw. See [screw parameters](#section-screw-parameters) for details on the parameters that define a screw.
// The tolerance determines the dimensions of the screw // The tolerance determines the dimensions of the screw
// based on ISO and ASME standards. Screws fabricated at those dimensions will mate properly with standard hardware. // based on ISO and ASME standards. Screws fabricated at those dimensions will mate properly with standard hardware.
// The $slop argument creates // The $slop argument creates an extra gap to account for printing overextrusion. It defaults to 0.
// an extra gap to account for printing overextrusion. It defaults to 0.
// . // .
// You can generate a screw specification from {{screw_info()}}, possibly modify it, and pass that in rather than giving the parameters. // You can generate a screw specification from {{screw_info()}}, possibly create a modified version, and pass that in rather than giving the parameters.
// .
// If you specify `internal=true` then you are creating a mask to make a threaded hole. Such threading masks follow
// the **nut** tolerance.
// Arguments: // Arguments:
// name = screw specification, e.g. "M5x1" or "#8-32". See [screw naming](#subsection-screw-naming). // name = screw specification, e.g. "M5x1" or "#8-32". See [screw naming](#subsection-screw-naming).
// head = head type. See [screw heads](#subsection-screw-heads) Default: none // head = head type. See [screw heads](#subsection-screw-heads) Default: none
@ -169,8 +167,10 @@ Torx values: https://www.stanleyengineeredfastening.com/-/media/web/sef/resourc
// spec = screw specification from `screw_info()`. If you specify this you can omit all the preceeding parameters. // spec = screw specification from `screw_info()`. If you specify this you can omit all the preceeding parameters.
// length = length of screw (in mm) // length = length of screw (in mm)
// shank = length of unthreaded portion of screw (in mm). Default: 0 // shank = length of unthreaded portion of screw (in mm). Default: 0
// internal = set to true to create a screw mask for clearance holes (with no threads) or for threaded holes. If true, the driver recess will not be created on headed screws. Default: false
// counterbore = set to length of counterbore, or true to make a counterbore equal to head height. Default: no counterbore
// details = toggle some details in rendering. Default: false // details = toggle some details in rendering. Default: false
// tolerance = screw tolerance. Determines actual screw thread geometry based on nominal sizing. See [tolerance](#subsection-tolerance). Default is "2A" for UTS and "6g" for ISO. // tolerance = screw tolerance. Determines actual screw thread geometry based on nominal sizing. See [tolerance](#subsection-tolerance). Default is "2A" for UTS and "6g" for ISO. If `internal=true` then default is "2B" for UTS and 6H for ISO.
// $slop = add extra gap to account for printer overextrusion. Default: 0 // $slop = add extra gap to account for printer overextrusion. Default: 0
// anchor = Translate so anchor point on the shaft is at origin (0,0,0). See [anchor](attachments.scad#subsection-anchor). Default: `BOTTOM` // anchor = Translate so anchor point on the shaft is at origin (0,0,0). See [anchor](attachments.scad#subsection-anchor). Default: `BOTTOM`
// anchor_head = Translate so anchor point on the head is at origin (0,0,0). See [anchor](attachments.scad#subsection-anchor). // anchor_head = Translate so anchor point on the head is at origin (0,0,0). See [anchor](attachments.scad#subsection-anchor).
@ -223,6 +223,11 @@ Torx values: https://www.stanleyengineeredfastening.com/-/media/web/sef/resourc
// screw("1/4", thread=0,length=8, anchor=TOP, head="round", drive="slot"); // screw("1/4", thread=0,length=8, anchor=TOP, head="round", drive="slot");
// screw("1/4", thread=0,length=8, anchor=TOP, head="round", drive="phillips"); // screw("1/4", thread=0,length=8, anchor=TOP, head="round", drive="phillips");
// screw("1/4", thread=0,length=8, anchor=TOP, head="round"); // screw("1/4", thread=0,length=8, anchor=TOP, head="round");
// }
// ydistribute(spacing=15){
// screw("1/4", thread=0,length=8, anchor=TOP, head="pan", drive="slot");
// screw("1/4", thread=0,length=8, anchor=TOP, head="pan", drive="phillips");
// screw("1/4", thread=0,length=8, anchor=TOP, head="pan");
// } // }
// ydistribute(spacing=15){ // ydistribute(spacing=15){
// screw("1/4", thread=0,length=8, anchor=TOP, head="fillister", drive="slot"); // screw("1/4", thread=0,length=8, anchor=TOP, head="fillister", drive="slot");
@ -259,6 +264,7 @@ Torx values: https://www.stanleyengineeredfastening.com/-/media/web/sef/resourc
// ydistribute(spacing=15){ // ydistribute(spacing=15){
// screw("M6x0", length=8, anchor=TOP, head="pan", drive="slot"); // screw("M6x0", length=8, anchor=TOP, head="pan", drive="slot");
// screw("M6x0", length=8, anchor=TOP, head="pan", drive="phillips"); // screw("M6x0", length=8, anchor=TOP, head="pan", drive="phillips");
// screw("M6x0", length=8, anchor=TOP, head="pan", drive="torx");
// screw("M6x0", length=8, anchor=TOP, head="pan"); // screw("M6x0", length=8, anchor=TOP, head="pan");
// screw("M6x0", length=8, anchor=TOP, head="pan flat"); // screw("M6x0", length=8, anchor=TOP, head="pan flat");
// } // }
@ -270,6 +276,7 @@ Torx values: https://www.stanleyengineeredfastening.com/-/media/web/sef/resourc
// ydistribute(spacing=15){ // ydistribute(spacing=15){
// screw("M6x0", length=8, anchor=TOP, head="cheese", drive="slot"); // screw("M6x0", length=8, anchor=TOP, head="cheese", drive="slot");
// screw("M6x0", length=8, anchor=TOP, head="cheese", drive="phillips"); // screw("M6x0", length=8, anchor=TOP, head="cheese", drive="phillips");
// screw("M6x0", length=8, anchor=TOP, head="cheese", drive="torx");
// screw("M6x0", length=8, anchor=TOP, head="cheese"); // screw("M6x0", length=8, anchor=TOP, head="cheese");
// } // }
// ydistribute(spacing=15){ // ydistribute(spacing=15){
@ -305,61 +312,70 @@ Torx values: https://www.stanleyengineeredfastening.com/-/media/web/sef/resourc
function screw(name, head="none", drive, thread="coarse", drive_size, oversize=0, spec, length, l, shank=0, tolerance=undef, details=true, anchor=undef,anchor_head=undef,spin=0, orient=UP) = no_function("screw"); function screw(name, head="none", drive, thread="coarse", drive_size, oversize=0, spec, length, l, shank=0, tolerance=undef, details=true, anchor=undef,anchor_head=undef,spin=0, orient=UP) = no_function("screw");
module screw(name, head="none", drive, thread="coarse", drive_size, oversize=0, spec, length, l, shank=0, tolerance=undef, details=true, anchor=undef,anchor_head=undef,spin=0, orient=UP) module screw(name, head="none", drive, thread="coarse", drive_size, oversize=0, internal=false,
spec, length, l, shank=0, tolerance=undef, details=true, shank_diam, counterbore=0,
atype="shaft",anchor=BOTTOM,spin=0, orient=UP)
{ {
a=echo(ssthread=thread);
spec = _validate_screw_spec( spec = _validate_screw_spec(
is_def(spec) ? spec : screw_info(name, head, drive, thread=thread, drive_size=drive_size, oversize=oversize) ); is_def(spec) ? spec
echo(sthread=thread); : screw_info(name, head, drive, thread=thread, drive_size=drive_size, oversize=oversize) );
echo_struct(spec,"spec"); echo_struct(spec,"spec");
head = struct_val(spec,"head"); head = struct_val(spec,"head");
pitch = struct_val(spec, "pitch"); pitch = struct_val(spec, "pitch");
diameter = struct_val(spec, "diameter"); nominal_diam = struct_val(spec, "diameter");
threadspec = pitch==0 ? undef : thread_specification(spec, internal=internal, tolerance=tolerance);
d_major = pitch==0 ? nominal_diam : mean(struct_val(threadspec, "d_major"));
shank_diam = first_defined([u_add(shank_diam,oversize),d_major]);
headless = head=="none"; headless = head=="none";
dummy1 = assert(in_list(atype,["shaft","head"]));
dummy2 = assert(atype=="shaft" || !headless, "You cannot anchor headless screws with atype=\"head\"");
eps = headless ? 0 eps = headless ? 0
: starts_with(head,"flat") ? -0.01 : starts_with(head,"flat") ? -0.01
: 0.01; : 0.01;
screwlen = one_defined([l,length],"l,length",dflt=undef); screwlen = one_defined([l,length],"l,length",dflt=undef);
length = u_add(first_defined([screwlen,struct_val(spec,"length")]) , eps); length = u_add(first_defined([screwlen,struct_val(spec,"length")]) , eps);
assert(all_positive(length), "Must specify positive length"); dummy3 = assert(all_positive(length), "Must specify positive length");
sides = max(12, segs(diameter/2)); sides = max(12, segs(nominal_diam/2));
unthreaded = is_undef(pitch) || pitch==0 ? length : shank; unthreaded = is_undef(pitch) || pitch==0 ? length : shank;
threaded = u_add(length,-unthreaded); threaded = u_add(length,-unthreaded);
//dd=assert(threaded==0 || oversize==0, "Only unthreaded screws can be made with nonzero oversize");
echo(t=threaded,length,unthreaded); echo(t=threaded,length,unthreaded);
head_height = headless || starts_with(head, "flat") ? 0 : struct_val(spec, "head_height"); head_height = headless || starts_with(head, "flat") ? 0 : struct_val(spec, "head_height");
head_diam = struct_val(spec, "head_size"); head_diam = struct_val(spec, "head_size");
head_size = headless ? [diameter, diameter, head_height] : attach_size = atype=="head" && head=="hex" ? [head_diam, head_diam*2/sqrt(3), head_height] : undef;
head == "hex" ? [head_diam, head_diam*2/sqrt(3), head_height] : attach_d = atype=="shaft" ? d_major
[head_diam, head_diam, head_height]; : head=="hex" ? undef
assert(num_defined([anchor,anchor_head])<=1, "Cannot define both `anchor` and `anchor_head`"); : head_diam;
head_anchor = is_def(anchor_head); attach_l = atype=="shaft" ? length
: head=="hex" ? undef
: head_height;
attachable( attachable(
d = head_anchor ? head_size[0] : diameter, // This code should be tweaked to pass diameter and length more cleanly size = attach_size,
l = head_anchor ? head_size[2] : length, d = attach_d,
orient = orient, l = attach_l,
anchor = first_defined([anchor, anchor_head, BOTTOM]), orient = orient,
//offset = head_anchor ? [0,0,head_height/2] : [0,0,-length/2], anchor = anchor,
spin = spin spin = spin)
)
{ {
up(head_anchor ? -head_height/2 : length/2) up(atype=="head" ? -head_height/2 : length/2)
difference(){ difference(){
union(){ union(){
screw_head(spec,details); screw_head(spec,details,counterbore=counterbore);
up(eps){ up(eps){
if (unthreaded>0){ if (unthreaded>0)
cyl(d=diameter, h=unthreaded+eps+(threaded>0?0.01:0), anchor=TOP, $fn=sides); cyl(d=shank_diam, h=unthreaded+eps+(threaded>0?0.01:0), anchor=TOP, $fn=sides);
} if (threaded>0){
if (threaded>0) down(unthreaded)
intersection(){ threaded_rod([mean(struct_val(threadspec, "d_minor")),
down(unthreaded) mean(struct_val(threadspec, "d_pitch")),
_rod(spec, length=threaded+eps, tolerance=tolerance, $fn=sides, anchor=TOP ); d_major],
if (details) pitch = struct_val(threadspec, "pitch"),
up(.01)cyl(d=diameter, l=length+.02+eps, chamfer1 = pitch/2, chamfer2 = headless ? pitch/2 : -pitch/2, anchor=TOP, $fn=sides); l=threaded+eps, left_handed=false, internal=internal,
} bevel1=details, $fn=sides, anchor=TOP);
}
} }
} }
_driver(spec); if (!internal) _driver(spec);
} }
children(); children();
} }
@ -369,7 +385,6 @@ module screw(name, head="none", drive, thread="coarse", drive_size, oversize=0,
module _driver(spec) module _driver(spec)
{ {
drive = struct_val(spec,"drive"); drive = struct_val(spec,"drive");
echo(drive=drive);
if (is_def(drive) && drive!="none") { if (is_def(drive) && drive!="none") {
echo(inside_drive=drive); echo(inside_drive=drive);
head = struct_val(spec,"head"); head = struct_val(spec,"head");
@ -380,7 +395,6 @@ module _driver(spec)
drive_depth = first_defined([struct_val(spec, "drive_depth"), .7*diameter]); // Note hack for unspecified depth drive_depth = first_defined([struct_val(spec, "drive_depth"), .7*diameter]); // Note hack for unspecified depth
head_top = starts_with(head,"flat") || head=="none" ? 0 : head_top = starts_with(head,"flat") || head=="none" ? 0 :
struct_val(spec,"head_height"); struct_val(spec,"head_height");
echo(drive_size=drive_size);
up(head_top-drive_depth){ up(head_top-drive_depth){
// recess should be positioned with its bottom center at (0,0) and the correct recess depth given above // recess should be positioned with its bottom center at (0,0) and the correct recess depth given above
if (drive=="phillips") phillips_mask(drive_size,anchor=BOTTOM); if (drive=="phillips") phillips_mask(drive_size,anchor=BOTTOM);
@ -561,18 +575,6 @@ function _exact_thread_tolerance(d,P) =
module _rod(spec, length, tolerance, orient=UP, spin=0, anchor=CENTER)
{
threadspec = thread_specification(spec, internal=false, tolerance=tolerance);
echo(d_major_mean = mean(struct_val(threadspec, "d_major")));
threaded_rod([mean(struct_val(threadspec, "d_minor")),
mean(struct_val(threadspec, "d_pitch")),
mean(struct_val(threadspec, "d_major"))],
pitch = struct_val(threadspec, "pitch"),
l=length, left_handed=false,
bevel=false, orient=orient, anchor=anchor, spin=spin);
}
// Module: nut() // Module: nut()
@ -618,10 +620,10 @@ module _rod(spec, length, tolerance, orient=UP, spin=0, anchor=CENTER)
// mark(3) nut("1/4-20", thickness=8, diameter=0.5*INCH,tolerance="3B"); // mark(3) nut("1/4-20", thickness=8, diameter=0.5*INCH,tolerance="3B");
// } // }
function nut(name, diameter, thickness, thread="coarse", oversize=0, spec, tolerance=undef, function nut(name, diameter, thickness, thread="coarse", spec, tolerance=undef,
bevel=false, anchor=BOTTOM,spin=0, orient=UP) = no_function("nut"); bevel=false, anchor=BOTTOM,spin=0, orient=UP) = no_function("nut");
module nut(name, diameter, thickness, thread="coarse", oversize=0, spec, tolerance=undef, module nut(name, diameter, thickness, thread="coarse", spec, tolerance=undef,
bevel=false, anchor=BOTTOM,spin=0, orient=UP) bevel=false, anchor=BOTTOM,spin=0, orient=UP)
{ {
assert(is_num(diameter) && diameter>0); assert(is_num(diameter) && diameter>0);
@ -643,6 +645,7 @@ module nut(name, diameter, thickness, thread="coarse", oversize=0, spec, toleran
function _parse_screw_name(name) = function _parse_screw_name(name) =
let( commasplit = str_split(name,","), let( commasplit = str_split(name,","),
length = parse_num(commasplit[1]), length = parse_num(commasplit[1]),
@ -663,13 +666,13 @@ function _parse_screw_name(name) =
// drive can be "hex", "phillips", "slot", "torx", or "none" // drive can be "hex", "phillips", "slot", "torx", or "none"
// or you can specify "ph0" up to "ph4" for phillips and "t20" for torx 20 // or you can specify "ph0" up to "ph4" for phillips and "t20" for torx 20
function _parse_drive(drive=undef, drive_size=undef) = function _parse_drive(drive=undef, drive_size=undef) =
let(f=echo(drive_size=drive_size)) is_undef(drive) ? ["none",undef]
is_undef(drive) ? ["none",undef] : : assert(is_string(drive))
let(drive = downcase(drive)) let(drive = downcase(drive))
in_list(drive,["hex","phillips", "slot", "torx", "phillips", "none"]) ? [drive, drive_size] : in_list(drive,["hex","phillips", "slot", "torx", "phillips", "none"]) ? [drive, drive_size]
drive[0]=="t" ? let(size = parse_int(substr(drive,1))) ["torx",size,torx_depth(size) ] : : drive[0]=="t" ? let(size = parse_int(substr(drive,1))) ["torx",size,torx_depth(size) ]
substr(drive,0,2)=="ph" ? ["phillips", parse_int(substr(drive,2))] : : starts_with(drive,"ph") && search(drive[2], "01234")!=[] ? ["phillips", ord(drive[2])-ord("0")]
assert(str("Unknown screw drive type ",drive)); : assert(false,str("Unknown screw drive type ",drive));
// Module: screw_head() // Module: screw_head()
@ -685,43 +688,58 @@ function _parse_drive(drive=undef, drive_size=undef) =
// screw_info = structure produced by {{screw_info()}} // screw_info = structure produced by {{screw_info()}}
// details = true for more detailed model. Default: false // details = true for more detailed model. Default: false
function screw_head(screw_info,details=false) = no_function("screw_head"); function screw_head(screw_info,details=false) = no_function("screw_head");
module screw_head(screw_info,details=false) { module screw_head(screw_info,details=false, counterbore=0) {
no_children($children); no_children($children);
head = struct_val(screw_info, "head"); head = struct_val(screw_info, "head");
head_size = struct_val(screw_info, "head_size"); head_size = struct_val(screw_info, "head_size");
head_height = struct_val(screw_info, "head_height"); head_height = struct_val(screw_info, "head_height");
if (head=="flat") { dum0=assert(is_def(head_height) || in_list(head,["flat","none"]), "Undefined head height only allowed with flat head or headless screws");
heightok = (is_undef(head_height) && in_list(head,["flat","none"])) || all_positive(head_height);
dum1=assert(heightok, "Head hight must be a postive number");
dum2=assert(counterbore==0 || counterbore==false || head!="none", "Cannot counterbore a headless screw");
counterbore = counterbore==false? 0
: head!="flat" && counterbore==true ? head_height
: counterbore;
assert(all_nonnegative(counterbore), str(counterbore==true? "Must specify numerical counterbore height with flat head screw"
: "Counterbore must be a nonnegative number"));
if (head!="flat" && counterbore>0)
cyl(d=head=="hex"? 2*head_size/sqrt(3) : head_size, l=counterbore, anchor=BOTTOM);
if (head=="flat") { // For flat head, counterbore is integrated
angle = struct_val(screw_info, "head_angle")/2; angle = struct_val(screw_info, "head_angle")/2;
full_height = head_size/2/tan(angle); full_height = head_size/2/tan(angle);
height = is_def(head_height) ? head_height : full_height; // if head_height is set we are making an undercut flat head
d2 = head_size*(1-height/full_height); height = first_defined([head_height, full_height]);
zflip() r1 = head_size/2;
cyl(d1=head_size, d2=d2, l=height, anchor=BOTTOM); r2 = r1*(1-height/full_height); // r2 is zero unless the head is undercut
rotate_extrude()
polygon([[0,-height],[r2,-height],[r1,0],if (counterbore>0) [r1,counterbore], [0,counterbore]]);
} }
if (in_list(head,["round","pan round","button","fillister","cheese"])) { if (head!="flat" && first_defined([head_height,0])>counterbore){
base = head=="fillister" ? 0.75*head_height : if (in_list(head,["round","pan round","button","fillister","cheese"])) {
head=="pan round" ? .6 * head_height : base = head=="fillister" ? 0.75*head_height :
head=="cheese" ? .7 * head_height : head=="pan round" ? .6 * head_height :
0.1 * head_height; // round and button head=="cheese" ? .7 * head_height :
head_size2 = head=="cheese" ? head_size-2*tan(5)*head_height : head_size; // 5 deg slope on cheese head 0.1 * head_height; // round and button
cyl(l=base, d1=head_size, d2=head_size2,anchor=BOTTOM, $fn=32) head_size2 = head=="cheese" ? head_size-2*tan(5)*head_height : head_size; // 5 deg slope on cheese head
attach(TOP) cyl(l=base, d1=head_size, d2=head_size2,anchor=BOTTOM)
rotate_extrude($fn=32) attach(TOP)
intersection(){ rotate_extrude()
arc(points=[[-head_size2/2,0], [0,-base+head_height * (head=="button"?4/3:1)], [head_size2/2,0]]); intersection(){
square([head_size2, head_height-base]); arc(points=[[-head_size2/2,0], [0,-base+head_height * (head=="button"?4/3:1)], [head_size2/2,0]]);
} square([head_size2, head_height-base]);
} }
if (head=="pan flat")
cyl(l=head_height, d=head_size, rounding2=0.2*head_size, anchor=BOTTOM);
if (head=="socket")
cyl(l=head_height, d=head_size, anchor=BOTTOM);
if (head=="hex")
intersection(){
linear_extrude(height=head_height) hexagon(id=head_size);
if (details)
down(.01)cyl(l=head_height+.02,d=2*head_size/sqrt(3), chamfer=head_size*(1/sqrt(3)-1/2), anchor=BOTTOM);
} }
if (head=="pan flat")
cyl(l=head_height, d=head_size, rounding2=0.2*head_size, anchor=BOTTOM);
if (head=="socket")
cyl(l=head_height, d=head_size, anchor=BOTTOM, chamfer2=details?struct_val(screw_info,"diameter")/10:undef);
if (head=="hex")
intersection(){
linear_extrude(height=head_height) hexagon(id=head_size);
if (details)
down(.01)cyl(l=head_height+.02,d=2*head_size/sqrt(3), chamfer=head_size*(1/sqrt(3)-1/2), anchor=BOTTOM);
}
}
} }
@ -768,17 +786,18 @@ function screw_info(name, head="none", drive, thread="coarse", drive_size=undef,
let(type=_parse_screw_name(name), let(type=_parse_screw_name(name),
drive_info = _parse_drive(drive, drive_size), drive_info = _parse_drive(drive, drive_size),
drive=drive_info[0], drive=drive_info[0],
screwdata = screwdata =
type[0] == "english" ? _screw_info_english(type[1],type[2], head, thread, drive) : type[0] == "english" ? _screw_info_english(type[1],type[2], head, thread, drive)
type[0] == "metric" ? _screw_info_metric(type[1], type[2], head, thread, drive) : : type[0] == "metric" ? _screw_info_metric(type[1], type[2], head, thread, drive)
[], : [],
over_ride = concat( over_ride = concat(
len(drive_info)>=3 ? ["drive_depth", drive_info[2]] : [], len(drive_info)>=3 ? ["drive_depth", drive_info[2]] : [],
is_def(type[3]) ? ["length",type[3]] : [], is_def(type[3]) ? ["length",type[3]] : [],
is_def(drive_info[1]) ? ["drive_size", drive_info[1]] : [], is_def(drive_info[1]) ? ["drive_size", drive_info[1]] : [],
["diameter", oversize+struct_val(screwdata,"diameter"), ["diameter", oversize+struct_val(screwdata,"diameter"),
"head_size", u_add(oversize,struct_val(screwdata,"head_size"))] "head_size", u_add(oversize,struct_val(screwdata,"head_size"))]
) ),
dfe=echo(over_ride=over_ride)
) )
struct_set(screwdata, over_ride); struct_set(screwdata, over_ride);
@ -889,33 +908,33 @@ function _screw_info_english(diam, threadcount, head, thread, drive) =
[["head", "hex"], ["head_size", INCH*entry[0]], ["head_height", INCH*entry[1]]] : [["head", "hex"], ["head_size", INCH*entry[0]], ["head_height", INCH*entry[1]]] :
head=="socket" ? let( head=="socket" ? let(
UTS_socket = [ // height = screw diameter UTS_socket = [ // height = screw diameter
//diam, hex, torx size, philips depth, torx depth //diam, hex, torx size, hex depth, torx depth
["#0", [ 0.096, 0.05, 6, 0.025, 0.027]], ["#0", [ 0.096, 0.05, 6, 0.025, 0.027]],
["#1", [ 0.118, 1/16, 7, 0.031, 0.036]], ["#1", [ 0.118, 1/16, 7, 0.031, 0.036]],
["#2", [ 9/64, 5/64, 8, 0.038, 0.037]], ["#2", [ 9/64, 5/64, 8, 0.038, 0.037]],
["#3", [ 0.161, 5/64, 8, 0.044, 0.041]], // For larger sizes, recess depth is ["#3", [ 0.161, 5/64, 8, 0.044, 0.041]], // For larger sizes, hex recess depth is
["#4", [ 0.183, 3/32, 10, 0.051, 0.049]], // half the diameter ["#4", [ 0.183, 3/32, 10, 0.051, 0.049]], // half the diameter
["#5", [ 0.205, 3/32, 10, 0.057, 0.049]], ["#5", [ 0.205, 3/32, 10, 0.057, 0.049]],
["#6", [ 0.226, 7/64, 15, 0.064, 0.058]], ["#6", [ 0.226, 7/64, 15, 0.064, 0.058]],
["#8", [ 0.270, 9/64, 25, 0.077, 0.078]], ["#8", [ 0.270, 9/64, 25, 0.077, 0.078]],
["#10",[ 5/16, 5/32, 27, undef, 0.088]], ["#10",[ 5/16, 5/32, 27, undef, 0.088]],
["#12",[ 0.324, 5/32, undef, undef, undef]], ["#12",[ 0.324, 5/32, undef, undef, undef]],
[1/4, [ 3/8, 3/16, 30, undef, 0.097]], [1/4, [ 3/8, 3/16, 30, undef, 0.097]],
[5/16, [ 15/32, 1/4, 45, undef, 0.137]], [5/16, [ 15/32, 1/4, 45, undef, 0.137]],
[3/8, [ 9/16, 5/16, 50, undef, 0.155]], [3/8, [ 9/16, 5/16, 50, undef, 0.155]],
[7/16, [ 21/32, 3/8, 55, undef, 0.202]], [7/16, [ 21/32, 3/8, 55, undef, 0.202]],
[1/2, [ 3/4, 3/8, 55, undef, 0.202]], [1/2, [ 3/4, 3/8, 55, undef, 0.202]],
[9/16, [ 27/32, 7/16, undef, undef, undef]], [9/16, [ 27/32, 7/16, undef, undef, undef]],
[5/8, [ 15/16, 1/2, 70, undef, 0.291]], [5/8, [ 15/16, 1/2, 70, undef, 0.291]],
[3/4, [ 1.125, 5/8, 80, undef, 0.332]], [3/4, [ 1.125, 5/8, 80, undef, 0.332]],
[7/8, [ 1+5/16, 3/4, 100, undef, 0.425]], [7/8, [ 1+5/16, 3/4, 100, undef, 0.425]],
[1, [ 1.5, 3/4, 100, undef, 0.425]], [1, [ 1.5, 3/4, 100, undef, 0.425]],
[1.125,[1+11/16, 7/8, undef, undef, undef]], [1.125,[1+11/16, 7/8, undef, undef, undef]],
[1.25, [ 1+7/8, 7/8, undef, undef, undef]], [1.25, [ 1+7/8, 7/8, undef, undef, undef]],
[1.375,[ 2+1/16, 1, undef, undef, undef]], [1.375,[ 2+1/16, 1, undef, undef, undef]],
[1.5, [ 2.25, 1, undef, undef, undef]], [1.5, [ 2.25, 1, undef, undef, undef]],
[1.75, [ 2+5/8, 1.25, undef, undef, undef]], [1.75, [ 2+5/8, 1.25, undef, undef, undef]],
[2, [ 3, 1.5, undef, undef, undef]], [2, [ 3, 1.5, undef, undef, undef]],
], ],
entry = struct_val(UTS_socket, diam), entry = struct_val(UTS_socket, diam),
hexdepth = is_def(entry[3]) ? entry[3] hexdepth = is_def(entry[3]) ? entry[3]
@ -927,26 +946,27 @@ function _screw_info_english(diam, threadcount, head, thread, drive) =
concat([["head","socket"],["head_size",INCH*entry[0]], ["head_height", INCH*diameter]],drive_size) : concat([["head","socket"],["head_size",INCH*entry[0]], ["head_height", INCH*diameter]],drive_size) :
head=="pan" ? let ( head=="pan" ? let (
UTS_pan = [ // pan head for phillips or slotted UTS_pan = [ // pan head for phillips or slotted
// diam, head ht slotted, head height phillips, phillips drive, phillips diam, phillips width, phillips depth, slot width, slot depth // head height
["#0", [0.116, 0.039, 0.044, 0, 0.067, 0.013, 0.039, 0.023, 0.022]], // diam, slotted phillips phillips drive, phillips diam, phillips width, phillips depth, slot width, slot depth torx size
["#1", [0.142, 0.046, 0.053, 0, 0.085, 0.015, 0.049, 0.027, 0.027]], ["#0", [0.116, 0.039, 0.044, 0, 0.067, 0.013, 0.039, 0.023, 0.022]],
["#2", [0.167, 0.053, 0.063, 1, 0.104, 0.017, 0.059, 0.031, 0.031]], ["#1", [0.142, 0.046, 0.053, 0, 0.085, 0.015, 0.049, 0.027, 0.027]],
["#3", [0.193, 0.060, 0.071, 1, 0.112, 0.019, 0.068, 0.035, 0.036]], ["#2", [0.167, 0.053, 0.063, 1, 0.104, 0.017, 0.059, 0.031, 0.031, 8]],
["#4", [0.219, 0.068, 0.080, 1, 0.122, 0.019, 0.078, 0.039, 0.040]], ["#3", [0.193, 0.060, 0.071, 1, 0.112, 0.019, 0.068, 0.035, 0.036]],
["#5", [0.245, 0.075, 0.089, 2, 0.158, 0.028, 0.083, 0.043, 0.045]], ["#4", [0.219, 0.068, 0.080, 1, 0.122, 0.019, 0.078, 0.039, 0.040, 10]],
["#6", [0.270, 0.082, 0.097, 2, 0.166, 0.028, 0.091, 0.048, 0.050]], ["#5", [0.245, 0.075, 0.089, 2, 0.158, 0.028, 0.083, 0.043, 0.045]],
["#8", [0.322, 0.096, 0.115, 2, 0.182, 0.030, 0.108, 0.054, 0.058]], ["#6", [0.270, 0.082, 0.097, 2, 0.166, 0.028, 0.091, 0.048, 0.050, 15]],
["#10",[0.373, 0.110, 0.133, 2, 0.199, 0.031, 0.124, 0.060, 0.068]], ["#8", [0.322, 0.096, 0.115, 2, 0.182, 0.030, 0.108, 0.054, 0.058, 20]],
["#12",[0.425, 0.125, 0.151, 3, 0.259, 0.034, 0.141, 0.067, 0.077]], ["#10",[0.373, 0.110, 0.133, 2, 0.199, 0.031, 0.124, 0.060, 0.068, 25]],
[1/4, [0.492, 0.144, 0.175, 3, 0.281, 0.036, 0.161, 0.075, 0.087]], ["#12",[0.425, 0.125, 0.151, 3, 0.259, 0.034, 0.141, 0.067, 0.077]],
[5/16, [0.615, 0.178, 0.218, 4, 0.350, 0.059, 0.193, 0.084, 0.106]], [1/4, [0.492, 0.144, 0.175, 3, 0.281, 0.036, 0.161, 0.075, 0.087, 30]],
[3/8, [0.740, 0.212, 0.261, 4, 0.389, 0.065, 0.233, 0.094, 0.124]], [5/16, [0.615, 0.178, 0.218, 4, 0.350, 0.059, 0.193, 0.084, 0.106]],
[3/8, [0.740, 0.212, 0.261, 4, 0.389, 0.065, 0.233, 0.094, 0.124]],
], ],
htind = drive=="slot" ? 1 : 2, htind = drive=="slot" ? 1 : 2,
entry = struct_val(UTS_pan, diam), entry = struct_val(UTS_pan, diam),
drive_size = drive=="phillips" ? [["drive_size", entry[3]], ["drive_diameter",INCH*entry[4]],["drive_width",INCH*entry[5]],["drive_depth",INCH*entry[6]]] : drive_size = drive=="phillips" ? [["drive_size", entry[3]], ["drive_diameter",INCH*entry[4]],["drive_width",INCH*entry[5]],["drive_depth",INCH*entry[6]]] :
[["drive_width", INCH*entry[7]], ["drive_depth",INCH*entry[8]]]) [["drive_width", INCH*entry[7]], ["drive_depth",INCH*entry[8]]])
concat([["head","pan"], ["head_size", INCH*entry[0]], ["head_height", INCH*entry[htind]]], drive_size) : concat([["head","pan round"], ["head_size", INCH*entry[0]], ["head_height", INCH*entry[htind]]], drive_size) :
head=="button" || head=="round" ? let( head=="button" || head=="round" ? let(
UTS_button = [ // button, hex or torx drive UTS_button = [ // button, hex or torx drive
// head diam, height, phillips, hex, torx, hex depth // head diam, height, phillips, hex, torx, hex depth
@ -1069,7 +1089,6 @@ function _screw_info_english(diam, threadcount, head, thread, drive) =
driveind = small && drive=="phillips" || !small && drive=="hex" ? 1 : driveind = small && drive=="phillips" || !small && drive=="hex" ? 1 :
drive=="torx" ? 2 : drive=="torx" ? 2 :
undef, undef,
fff=echo("------------------------", driveind),
drive_dims = small ? ( drive_dims = small ? (
drive=="phillips" && !undercut ? [["drive_diameter",INCH*entry[4]], drive=="phillips" && !undercut ? [["drive_diameter",INCH*entry[4]],
["drive_width",INCH*entry[6]],["drive_depth",INCH*entry[5]]] : ["drive_width",INCH*entry[6]],["drive_depth",INCH*entry[5]]] :
@ -1199,34 +1218,35 @@ function _screw_info_metric(diam, pitch, head, thread, drive) =
) )
[["head", "hex"], ["head_size", entry[0]], ["head_height", entry[1]]] : [["head", "hex"], ["head_size", entry[0]], ["head_height", entry[1]]] :
head=="socket" ? let( head=="socket" ? let(
// ISO 14579 gives dimensions for Torx (hexalobular) socket heads
metric_socket = [ // height = screw diameter metric_socket = [ // height = screw diameter
//diam, hex //diam, hex, torx size, torx depth
[1.4, [2.5, 1.3]], [1.4, [2.5, 1.3]],
[1.6, [3, 1.5]], [1.6, [3, 1.5]],
[2, [3.8, 1.5, 6, 0.77]], [2, [3.8, 1.5, 6, 0.775]],
[2.5, [4.5, 2, 8, 1.05]], [2.5, [4.5, 2, 8, 0.975]],
[2.6, [5, 2, 8, 1.05]], [2.6, [5, 2, 8, 1.05]],
[3, [5.5, 2.5, 10, 1.24]], [3, [5.5, 2.5, 10, 1.14]],
[3.5, [6.2, 2.5]], [3.5, [6.2, 2.5]] ,
[4, [7, 3, 25, 1.76]], [4, [7, 3, 25, 1.61]],
[5, [8.5, 4, 27, 2.24]], [5, [8.5, 4, 27, 1.84]],
[6, [10, 5, 30, 2.47]], [6, [10, 5, 30, 2.22]],
[7, [12, 6]], [7, [12, 6]],
[8, [13, 6, 45, 3.48]], [8, [13, 6, 45, 3.115]],
[10, [16, 8, 50, 3.93]], [10, [16, 8, 50, 3.82]],
[12, [18, 10, 55, 5.15]], [12, [18, 10, 55, 5.015]],
[14, [21, 12]], [14, [21, 12, 60, 5.805]],
[16, [24, 14, 70, 7.39]], [16, [24, 14, 70, 6.815]],
[18, [27, 14]], [18, [27, 14, 80, 7.75]],
[20, [30, 17, 90, 9.67]], [20, [30, 17, 90, 8.945]],
[22, [33, 17]], [22, [33, 17]],
[24, [36, 19, 100, 10.79]], [24, [36, 19, 100, 10.79]],
[27, [40, 19]], [27, [40, 19]],
[30, [45, 22]], [30, [45, 22]],
[33, [50, 24]], [33, [50, 24]],
[36, [54, 27]], [36, [54, 27]],
[42, [63, 32]], [42, [63, 32]],
[48, [72, 36]], [48, [72, 36]],
], ],
entry = struct_val(metric_socket, diam), entry = struct_val(metric_socket, diam),
drive_size = drive=="hex" ? [["drive_size",entry[1]],["drive_depth",diam/2]] : drive_size = drive=="hex" ? [["drive_size",entry[1]],["drive_depth",diam/2]] :
@ -1235,87 +1255,112 @@ function _screw_info_metric(diam, pitch, head, thread, drive) =
) )
concat([["head","socket"],["head_size",entry[0]], ["head_height", diam]],drive_size) : concat([["head","socket"],["head_size",entry[0]], ["head_height", diam]],drive_size) :
starts_with(head,"pan") ? let ( starts_with(head,"pan") ? let (
metric_pan = [ // pan head for phillips or slotted metric_pan = [ // pan head for phillips or slotted, torx from ISO 14583
// diam, slotted diam, phillips diam, phillips depth, ph width, slot width,slot depth // head height
[1.6,[3.2, 1 , 1.3, 0, undef,undef,undef, 0.4, 0.35]], // diam, slotted phillips phillips size phillips diam, phillips depth, ph width, slot width,slot depth, torx size, torx depth
[2, [4, 1.3, 1.6, 1, 1.82, 1.19, 0.48, 0.5, 0.5]], [1.6, [3.2, 1 , 1.3, 0, undef, undef, undef, 0.4, 0.35]],
[2.5,[5, 1.5, 2, 1, 2.68, 1.53, 0.70, 0.6, 0.6]], [2, [4, 1.3, 1.6, 1, 1.82, 1.19, 0.48, 0.5, 0.5, 6, 0.7]],
[3, [5.6, 1.8, 2.4, 1, 2.90, 1.76, 0.74, 0.8, 0.7]], [2.5, [5, 1.5, 2, 1, 2.68, 1.53, 0.70, 0.6, 0.6, 8, 0.975]],
[3.5,[7, 2.1, 3.1, 2, 3.92, 1.95, 0.87, 1.0, 0.8]], [3, [5.6, 1.8, 2.4, 1, 2.90, 1.76, 0.74, 0.8, 0.7, 10, 1.14]],
[4, [8, 2.4 , 3.1, 2, 4.40, 2.45, 0.93, 1.2, 1.0]], [3.5, [7, 2.1, 3.1, 2, 3.92, 1.95, 0.87, 1.0, 0.8, 15, 1.2]],
[5, [9.5, 3, 3.8, 2, 4.90, 2.95, 1.00, 1.2, 1.2]], [4, [8, 2.4 , 3.1, 2, 4.40, 2.45, 0.93, 1.2, 1.0, 20, 1.465]],
[6, [12, 3.6, 4.6, 3, 6.92, 3.81, 1.14, 1.6, 1.4]], [5, [9.5, 3, 3.8, 2, 4.90, 2.95, 1.00, 1.2, 1.2, 25, 1.715]],
[8, [16, 4.8, 6, 4, 9.02, 4.88, 1.69, 2.0, 1.9]], [6, [12, 3.6, 4.6, 3, 6.92, 3.81, 1.14, 1.6, 1.4, 30, 2.22]],
[10, [20, 6.0, 7.5, 4, 10.18, 5.09, 1.84,2.5, 2.4]], [8, [16, 4.8, 6, 4, 9.02, 4.88, 1.69, 2.0, 1.9, 45, 2.985]],
[10, [20, 6.0, 7.5, 4, 10.18, 5.09, 1.84, 2.5, 2.4, 50, 3.82]],
], ],
type = head=="pan" ? (drive=="slot" ? "pan flat" : "pan round") : head, type = head=="pan" ? (drive=="slot" ? "pan flat" : "pan round") : head,
htind = drive=="slot" ? 1 : 2, htind = drive=="slot" ? 1 : 2,
entry = struct_val(metric_pan, diam), entry = struct_val(metric_pan, diam),
drive_size = drive=="phillips" ? [["drive_size", entry[3]], ["drive_diameter", entry[4]], ["drive_depth",entry[5]], ["drive_width",entry[6]]] : drive_size = drive=="phillips" ? [["drive_size", entry[3]], ["drive_diameter", entry[4]], ["drive_depth",entry[5]], ["drive_width",entry[6]]]
drive=="slot" ? [["drive_width", entry[7]], ["drive_depth", entry[8]]] : [] : drive=="torx" ? [["drive_size", entry[9]], ["drive_depth", entry[10]]]
: drive=="slot" ? [["drive_width", entry[7]], ["drive_depth", entry[8]]]
: []
) )
concat([["head",type], ["head_size", entry[0]], ["head_height", entry[htind]]], drive_size) : concat([["head",type], ["head_size", entry[0]], ["head_height", entry[htind]]], drive_size) :
head=="button" || head=="cheese" ? let( head=="button" || head=="cheese" ? let(
// hex drive depth from ISO 7380-1
metric_button = [ // button, hex drive metric_button = [ // button, hex drive
// head diam, height, hex, phillips, hex drive depth // head diam, height, hex, phillips, hex drive depth, torx size, torx depth
[1.6, [2.9, 0.8, 0.9, undef, 0.55]], // These four cases, [1.6, [2.9, 0.8, 0.9, undef, 0.55]], // These four cases,
[2, [3.5, 1.3, 1.3, undef, 0.69]], // extrapolated hex depth [2, [3.5, 1.3, 1.3, undef, 0.69]], // extrapolated hex depth
[2.2, [3.8, 0.9, 1.3, undef, 0.76]], // [2.2, [3.8, 0.9, 1.3, undef, 0.76]], //
[2.5, [4.6, 1.5, 1.5, undef, 0.87]], // [2.5, [4.6, 1.5, 1.5, undef, 0.87]], //
[3, [5.7, 1.65, 2, undef, 1.04, 8, 0.81]], [3, [5.7, 1.65, 2, undef, 1.04, 8, 0.81]],
[3.5, [5.7, 1.65, 2, undef, 1.21]], // interpolated hex depth [3.5, [5.7, 1.65, 2, undef, 1.21]], // interpolated hex depth
[4, [7.6, 2.2, 2.5, undef, 1.30, 15, 1.3]], [4, [7.6, 2.2, 2.5, undef, 1.30, 15, 1.3]],
[5, [9.5, 2.75, 3, undef, 1.56, 25, 1.56]], [5, [9.5, 2.75, 3, undef, 1.56, 25, 1.56]],
[6, [10.5,3.3, 4, undef, 2.08, 27, 2.08]], [6, [10.5, 3.3, 4, undef, 2.08, 27, 2.08]],
[8, [14, 4.4, 5, undef, 2.60, 40, 2.3]], [8, [14, 4.4, 5, undef, 2.60, 40, 2.3]],
[10, [17.5,5.5, 6, undef, 3.21, 45, 2.69]], [10, [17.5, 5.5, 6, undef, 3.12, 45, 2.69]],
[12, [21, 6.6, 8, undef, 4.16, 55, 4.02]], [12, [21, 6.6, 8, undef, 4.16, 55, 4.02]],
[16, [28, 8.8, 10, undef, 5.55]], // interpolated hex depth [16, [28, 8.8, 10, undef, 5.2]],
], ],
metric_cheese = [ // slotted, phillips ISO 1207, ISO 7048 metric_cheese = [ // slotted, phillips ISO 1207, ISO 7048
// head diam, head height, hex drive, phillips drive, slot width, slight depth, ph diam // hex drive is not supported (hence undefs)
[1, [2, 0.7, undef, undef]], // head diam, head height, hex drive, phillips drive, slot width, slot depth, ph diam
[1.2, [2.3,0.8, undef, undef]], [1, [2, 0.7, undef, undef]],
[1.4, [2.6,0.9, undef, undef]], [1.2, [2.3, 0.8, undef, undef]],
[1.6, [3, 1, undef, undef, 0.4, 0.45]], [1.4, [2.6, 0.9, undef, undef]],
[2, [3.8,1.3, undef, 1 , 0.5, 0.6]], [1.6, [3, 1, undef, undef, 0.4, 0.45]],
[2.5, [4.5,1.6, undef, 1 , 0.6, 0.7, 2.7,1.2]], [2, [3.8, 1.3, undef, 1 , 0.5, 0.6, undef, undef]],
[3, [5.5,2, undef, 2 , 0.8, 0.85, 3.5,0.86]], [2.5, [4.5, 1.6, undef, 1 , 0.6, 0.7, 2.7, 1.20]],
[3.5, [6, 2.4, undef, 2 , 1.0, 1.0, 3.8, 1.15]], [3, [5.5, 2, undef, 2 , 0.8, 0.85, 3.5, 0.86]],
[4, [7, 2.6, undef, 2 , 1.2, 1.1, 4.1, 1.45]], [3.5, [6, 2.4, undef, 2 , 1.0, 1.0, 3.8, 1.15]],
[5, [8.5,3.3, undef, 2 , 1.2, 1.3, 4.8, 2.14]], [4, [7, 2.6, undef, 2 , 1.2, 1.1, 4.1, 1.45]],
[6, [10, 3.9, undef, 3 , 1.6, 1.6, 6.2, 2.25]], [5, [8.5, 3.3, undef, 2 , 1.2, 1.3, 4.8, 2.14]],
[8, [13, 5, undef, 3 , 2.0, 2.0, 7.7, 3.73]], [6, [10, 3.9, undef, 3 , 1.6, 1.6, 6.2, 2.25]],
[10, [16, 6, undef, undef, 2.5, 2.4]] [8, [13, 5, undef, 3 , 2.0, 2.0, 7.7, 3.73]],
[10, [16, 6, undef, undef, 2.5, 2.4, undef, undef]]
], ],
entry = struct_val(head=="button" ? metric_button : metric_cheese, diam), metric_cheese_torx = [ // torx cheese, ISO 14580, the heads are taller than other cheese screws
drive_index = drive=="phillips" ? 3 : //head diam, head height, torx size, torx depth
drive=="hex" ? 2 : undef, [2, [3.8, 1.55, 6, 0.775]],
drive_dim = head=="button" && drive=="hex" ? [["drive_depth", entry[4]]] : [2.5, [4.5, 1.85, 8, 0.845]],
head=="button" && drive=="torx" ? [["drive_size", entry[5]],["drive_depth", entry[6]]] : [3, [5.5, 2.4, 10, 1.14]],
head=="cheese" && drive=="slot" ? [["drive_width", entry[4]], ["drive_depth", entry[5]]] : [3.5, [6, 2.6, 15, 1.2]],
head=="cheese" && drive=="phillips" ? [["drive_diameter", entry[6]], ["drive_depth", entry[7]], [4, [7, 3.1, 20, 1.465]],
["drive_width", entry[6]/4]]: // Fabricated this width value to fill in missing field [5, [8.5, 3.65, 25, 1.715]],
[], [6, [10, 4.4, 30, 2.095]],
drive_size = is_def(drive_index) ? [["drive_size", entry[drive_index]]] : [] [8, [13, 5.8, 45, 2.855]],
[10, [16, 6.9, 59, 3.235]]
],
entry = struct_val( head=="button" ? metric_button
: drive=="torx"? metric_cheese_torx
: metric_cheese,
diam),f=echo(entry=entry),
drive_index = drive=="phillips" ? 3
: drive=="hex" ? 2
: undef,
drive_dim = head=="button" && drive=="hex" ? [["drive_depth", entry[4]]]
: head=="button" && drive=="torx" ? [["drive_size", entry[5]],["drive_depth", entry[6]]]
: head=="cheese" && drive=="torx" ? [["drive_size", entry[2]],["drive_depth", entry[3]]]
: head=="cheese" && drive=="slot" ? [["drive_width", entry[4]], ["drive_depth", entry[5]]]
: head=="cheese" && drive=="phillips" ? [["drive_diameter", entry[6]], ["drive_depth", entry[7]],
["drive_width", entry[6]/4]] // Fabricated this width value to fill in missing field
:[],
drive_size = is_def(drive_index) ? [["drive_size", entry[drive_index]]] : [],
fda=echo(ds=drive_size)
) )
concat([["head",head],["head_size",entry[0]], ["head_height", entry[1]]],drive_size, drive_dim) : concat([["head",head],["head_size",entry[0]], ["head_height", entry[1]]],drive_size, drive_dim) :
starts_with(head,"flat") ? let( starts_with(head,"flat") ? let(
small = head == "flat small" || (head=="flat" && (drive!="hex" && drive!="torx")), small = head == "flat small" || (head=="flat" && (drive!="hex" && drive!="torx")),
metric_flat_large = [ // for hex drive metric_flat_large = [ // for hex drive
[2, [4, 1.3,undef]], // diam hex size hex depth torx torx depth
[2.5,[5, 1.5, undef]], [2, [4, 1.3, undef]],
[3, [6, 2 , 1.1, 10, 0.96]], [2.5,[5, 1.5, undef]],
[4, [8, 2.5, 1.5, 20, 1.34]], [3, [6, 2 , 1.1, 10, 0.96]],
[5, [10, 3 , 1.9, 25, 1.54]], [4, [8.25, 2.5, 1.5, 20, 1.34]],
[6, [12, 4 , 2.2, 30, 1.91]], [5, [10, 3 , 1.9, 25, 1.54]],
[8, [16, 5 , 3.0, 40, 2.3]], [6, [12.5, 4 , 2.2, 30, 1.91]],
[10, [20, 6 , 3.6, 50, 3.04]], [8, [16.5, 5 , 3.0, 40, 2.3]],
[12, [24, 8 ,undef]], [10, [21, 6 , 3.6, 50, 3.04]],
[14, [27, 10 ,undef]], [12, [25, 8 , 4.3]],
[16, [30, 10 ,undef]], [14, [28.5, 10 , 4.5]],
[18, [33, 12 ,undef]], [16, [31, 10 , 4.8]],
[20, [36, 12 ,undef]], [18, [33, 12 , undef]],
[20, [38, 12 , 5.6]]
], ],
metric_flat_small = [ // for phillips, slotted metric_flat_small = [ // for phillips, slotted
// Phillips from ASME B18.6.7M (ISO 7046 gives different values), // Phillips from ASME B18.6.7M (ISO 7046 gives different values),
@ -1351,9 +1396,10 @@ function _screw_info_metric(diam, pitch, head, thread, drive) =
concat([["head","flat"],["head_angle",90],["head_size",entry[0]]], concat([["head","flat"],["head_angle",90],["head_size",entry[0]]],
is_def(driveind) ? [["drive_size", entry[driveind]]] : [], is_def(driveind) ? [["drive_size", entry[driveind]]] : [],
drive_dim drive_dim
) : [] ) : []
) )
concat([["system","ISO"],["diameter",diam],["pitch", pitch],["drive",drive]], concat(
[["system","ISO"],["diameter",diam],["pitch", pitch],["drive",drive]],
head_data head_data
); );
@ -1389,7 +1435,7 @@ function _validate_screw_spec(spec) = let(
assert(diamOK, str("Screw spec has invalid \"diameter\", ", struct_val(spec,"diameter"))) assert(diamOK, str("Screw spec has invalid \"diameter\", ", struct_val(spec,"diameter")))
assert(pitchOK, str("Screw spec has invalid \"pitch\", ", pitch)) assert(pitchOK, str("Screw spec has invalid \"pitch\", ", pitch))
assert(headOK, "Screw spec head type invalid or unknown for your screw type and size") assert(headOK, "Screw spec head type invalid or unknown for your screw type and size")
assert(driveOK, "Screw drive type invalid or unknown for your screw size or head type") assert(driveOK, str("Screw drive type \"",drive,"\" invalid or unknown for your screw size or head type, \"",head,"\""))
spec; spec;
@ -1465,4 +1511,107 @@ http://files.engineering.com/getfile.aspx?folder=76fb0d5e-1fff-4c49-87a5-0597947
// thread standards: // thread standards:
// https://www.gewinde-normen.de/en/index.html // https://www.gewinde-normen.de/en/index.html
///////////////////////////////////////////////////////
//
// how to make screw mask: examples (e.g. for clearance hole w/ countersink)
// how to make a screw hole (a mask function?)
//
// vim: expandtab tabstop=4 shiftwidth=4 softtabstop=4 nowrap // vim: expandtab tabstop=4 shiftwidth=4 softtabstop=4 nowrap
/*
["#0", 0.0615 (.-002 to 0)
["#1", 3/32
["#2", 3/32
["#3", 1/8
["#4", 1/8
["#5", 5/32
["#6", 5/32
["#8", 3/16
["#10",1/4
["#12",
[1/4, 5/16 .004
[5/16, 3/8
[3/8, 1/2 .004
[7/16,
[1/2, 5/8
[9/16,
[5/8, 3/4
[3/4, 1
[7/8, 1 1/4
[1, 1 1/2
[1.125, 1 1/2
[1.25,
[1.375,
[1.5,
[1.75,
[2,
[1 ,
[1.2,
[1.4,
[1.6, 2 .072 to .01 tol
[1.7,
[1.8,
[2 , 3
[2.2,
[2.3,
[2.5,
[2.6,
[3 , 4
[3.5,
[4 , 5
[5 , 6 (or 6.5)
[6 , 8
[7 ,
[8 , 10
[9 ,
[10 , 12 or 13
[11 ,
[12 , 16
[14 ,
[16 , 20
[18 ,
[20 , 24
[22 ,
[24 ,
[27 ,
[30 ,
[33 ,
[36 ,
[39 ,
[42 ,
[45 ,
[48 ,
[52 ,
[56 ,
[60 ,
[64 ,
[68 ,
[72 ,
[80 ,
[90 ,
[100,
*/
/*
knurling table for metric socket heads:
added diameter:
m2-m3: +0.18
m4-m6: +0.22
m8-m12: +0.27
m14-m20: +0.33
*/