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NPT threading fixes.

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This commit is contained in:
Garth Minette 2021-06-09 18:29:29 -07:00
parent 203023b03b
commit 1670b0fa16
2 changed files with 45 additions and 24 deletions
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39
threading.scad
View file

@ -208,7 +208,7 @@ module trapezoidal_threaded_rod(
prof = apply(side_mat, [
for (thread = [-threads/2:1:threads/2-1]) let(
tang = (thread/starts) * 360 + ang,
hsc =
hsc = internal? 1 :
abs(tang) > twist/2? 0 :
(higang1==0 && higang2==0)? 1 :
lookup(tang, hig_table),
@ -225,7 +225,7 @@ module trapezoidal_threaded_rod(
];
thread_vnfs = vnf_merge([
for (i=[0:1:starts-1])
zrot(i*360/starts, p=vnf_vertex_array(thread_verts, reverse=left_handed)),
zrot(i*360/starts, p=vnf_vertex_array(thread_verts, reverse=left_handed, style="min_edge")),
for (i=[0:1:starts-1]) let(
rmat = zrot(i*360/starts),
pts = deduplicate(list_head(thread_verts[0], len(prof3d)+1)),
@ -447,11 +447,15 @@ module threaded_nut(
// Module: npt_threaded_rod()
// Description:
// Constructs a standard NPT pipe threading.
// Constructs a standard NPT pipe end threading. If `internal=true`, creates a mask for making
// internal pipe threads. Tapers smaller upwards if `internal=false`. Tapers smaller downwards
// if `internal=true`. If `hollow=true` and `internal=false`, then the pipe threads will be
// hollowed out into a pipe with the apropriate internal diameter.
// Arguments:
// d = Outer diameter of threaded rod.
// left_handed = if true, create left-handed threads. Default = false
// bevel = if true, bevel the thread ends. Default: false
// size = NPT standard pipe size in inches. 1/16", 1/8", 1/4", 3/8", 1/2", 3/4", 1", 1+1/4", 1+1/2", or 2". Default: 1/2"
// left_handed = If true, create left-handed threads. Default = false
// bevel = If true, bevel the thread ends. Default: false
// hollow = If true, create a pipe with the correct internal diameter.
// internal = If true, make this a mask for making internal threads.
// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#anchor). Default: `CENTER`
// spin = Rotate this many degrees around the Z axis after anchor. See [spin](attachments.scad#spin). Default: `0`
@ -467,9 +471,16 @@ module npt_threaded_rod(
size=1/2,
left_handed=false,
bevel=false,
hollow=false,
internal=false,
anchor, spin, orient
) {
assert(is_finite(size));
assert(is_bool(left_handed));
assert(is_bool(bevel));
assert(is_bool(hollow));
assert(is_bool(internal));
assert(!(internal&&hollow), "Cannot created a hollow internal threads mask.");
info_table = [
// Size OD len TPI
[ 1/16, [ 0.3896, 0.308, 27 ]],
@ -488,8 +499,10 @@ module npt_threaded_rod(
l = 25.4 * info[0];
d = 25.4 * info[1];
pitch = 25.4 / info[2];
r1 = get_radius(d=d, dflt=0.84 * 25.4 / 2);
r2 = r1 - l/32;
rr = get_radius(d=d, dflt=0.84 * 25.4 / 2);
rr2 = rr - l/32;
r1 = internal? rr2 : rr;
r2 = internal? rr : rr2;
depth = pitch * cos(30) * 5/8;
profile = internal? [
[-6/16, -depth/pitch],
@ -506,6 +519,8 @@ module npt_threaded_rod(
[ 6/16, -depth/pitch],
[ 7/16, -depth/pitch*1.07]
];
attachable(anchor,spin,orient, l=l, r1=r1, r2=r2) {
difference() {
trapezoidal_threaded_rod(
d1=2*r1, d2=2*r2, l=l,
pitch=pitch,
@ -519,7 +534,13 @@ module npt_threaded_rod(
anchor=anchor,
spin=spin,
orient=orient
) children();
);
if (hollow) {
cylinder(l=l+1, d=size*INCH, center=true);
} else nil();
}
children();
}
}

4
transforms.scad
View file

@ -946,8 +946,8 @@ function yscale(y=1, p, cp=0, planar=false) =
assert(is_bool(planar))
let( cp = is_num(cp)? [0,cp,0] : cp )
(planar || (!is_undef(p) && len(p)==2))
? scale([1,y],p=p)
: scale([1,y,1],p=p);
? scale([1,y], cp=cp, p=p)
: scale([1,y,1], cp=cp, p=p);
// Function&Module: zscale()