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error check for nonexistent pitch, doc fixes

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Adrian Mariano 2023-06-15 18:41:03 -04:00
parent 9b6abb6e31
commit 4a4f871ae8
1 changed files with 23 additions and 7 deletions
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30
screws.scad
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@ -23,22 +23,33 @@ include <screw_drive.scad>
// including tolerances for screw fit. You can also create screws with
// various head types and drive types that should match standard hardware.
// Subsection: Screw Naming
// You can specify screws using a string that specifies the screw.
// For ISO (metric) screws the specification has the form: "M`<size>`x`<pitch>`,`<length>`,
// You can specify screws using a string that specifies the screw.
// Metric or ISO screws are specified by a diameter in millimeters and a thread pitch in millimeters. For example,
// an M8x2 screw has a nominal diameter of 8 mm and a thread pitch of 2 mm.
// The screw specification for these screws 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.
// 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". If you omit the
// length then you must provide the `length` parameter. If you omit the pitch, the library
// provides a standard pitch for the specified diameter.
// .
// For UTS (English) screws the specification has the form `<size>`-`<threadcount>`,`<length>`, e.g.
// Imperial or UTS screws are specified by a diameter and the number of threads per inch.
// For large screws, the diameter is simply the nominal diameter in inches, so a 5/16-18 screw
// has a nominal diameter of 5/16 inches and 18 threads per inch. For diameters smaller than
// 1/4 inch, the screw diameter is given using a screw gauge, which can be from 0 up to 12.
// A common smaller size is #8-32, an 8 gauge screw with 32 threads per inch.
// For UTS screws the specification 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
// number from 0 to 12 with or without a leading # to specify a screw gauge size, or any other
// gauge 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
// "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
// 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 in the metric case, if you omit the length then you must provide the `length` parameter. If you omit the pitch, the
// library provides a standard pitch for the specified diameter.
// Subsection: Standard Screw Pitch
// 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 as listed in ISO 724 or ASME B1.1. For many diameters, multiple standard pitches exist.
// The available thread pitch types are different for ISO and UTS:
// .
// | ISO | UTS |
@ -566,7 +577,9 @@ module screw(spec, head, drive, thread, drive_size,
dummy = _validate_screw_spec(spec);
$screw_spec = spec;
pitch = struct_val(spec, "pitch") ;
fdsa= echo(pitch=pitch);
threadspec = pitch==0 ? undef : thread_specification(spec, internal=_internal, tolerance=tolerance);
f=echo(threadspec);
nominal_diam = _nominal_diam(spec);
d_major = pitch==0 ? nominal_diam : mean(struct_val(threadspec, "d_major"));
length = struct_val(spec,"length");
@ -2178,6 +2191,7 @@ function _screw_info_english(diam, threadcount, head, thread, drive) =
tentry = struct_val(UTS_thread, diam)
)
assert(is_def(tentry), str("Unknown screw size, \"",diam,"\""))
assert(is_def(tentry[tind]), str("No ",thread," pitch known for screw size, \"",diam,"\""))
INCH / tentry[tind],
head_data =
head=="none" ? let (
@ -2607,8 +2621,10 @@ function _screw_info_metric(diam, pitch, head, thread, drive) =
],
tentry = struct_val(ISO_thread, diam)
)
assert(is_def(tentry), str("Unknown screw size, M",diam,""))
assert(is_def(tentry), str("Unknown screw size, M",diam))
assert(is_def(tentry[tind]), str("No ",thread," pitch known for M",diam))
tentry[tind],
head_data =
head=="none" ? let(
metric_setscrew =