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Add error checking for bad head

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Fix docs
This commit is contained in:
Adrian Mariano 2023-02-02 23:04:33 -05:00
parent 33442c4230
commit 733d907c91
1 changed files with 3 additions and 2 deletions
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5
screws.scad
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@ -235,7 +235,7 @@ Torx values: https://www.stanleyengineeredfastening.com/-/media/web/sef/resourc
// length / l = length of screw (in mm)
// thread = thread type or specification. See [screw pitch](#subsection-standard-screw-pitch). Default: "coarse"
// drive_size = size of drive recess to override computed value
// thread_len = length of threaded portoin of screw (in mm), for making partly threaded screws. Default: fully threaded
// thread_len = length of threaded portion of screw (in mm), for making partly threaded screws. Default: fully threaded
// details = toggle some details in rendering. Default: true
// 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.
// undersize = amount to decrease screw diameter, a scalar to apply to all parts, or a 2-vector to control shaft and head. Default: 0
@ -718,7 +718,7 @@ module screw(spec, head, drive, thread, drive_size,
// need to adjust $slop for best results. Some people screw machine screws directly into plastic without tapping. This works better with a somewhat larger hole, so
// a tolerance of "self tap" produces such a hole. Note that this tolerance also makes the default bevel2=true to bevel the top, which makes it much easier
// to start the screw. The "self tap" tolerance subtracts `0.72 * pitch` when pitch is below 1mm, `0.6 * pitch` when the pitch is over 1.5mm, and it interpolates between.
// It was tested in PLA with a Prusa MK3S and $slop=0.5 and worked on UTS screws from #2 up to 1/2 inch.
// It was tested in PLA with a Prusa MK3S and $slop=0.05 and worked on UTS screws from #2 up to 1/2 inch.
// .
// The counterbore parameter adds a cylindrical clearance hole above the screw shaft. For flat heads it extends above the flathead and for other screw types it
// replaces the head with a cylinder large enough in diameter for the head to fit. For a flat head you must specify the length of the counterbore. For other heads you can
@ -1792,6 +1792,7 @@ function screw_info(name, head, drive, thread, drive_size, threads_oversize=0, h
: type[0] == "metric" ? _screw_info_metric(type[1], type[2], head, thread, drive)
: []
)
assert(is_def(struct_val(screwdata,"head")),str("Screw head \"",head,"\" unknown or unsupported for specified screw"))
_struct_reset(screwdata,
[
["drive_depth", drive_info[2]],