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propagate fix for negative helix angles

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to function spur_gear and module ring_gear
This commit is contained in:
John Doe 2024-12-24 08:29:32 -05:00
parent a25f706800
commit 61cb5eaf56
1 changed files with 2 additions and 2 deletions
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4
gears.scad
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@ -932,7 +932,7 @@ function spur_gear(
: assert(false,"atype must be one of \"root\", \"tip\" or \"pitch\""), : assert(false,"atype must be one of \"root\", \"tip\" or \"pitch\""),
circum = 2 * PI * pr, circum = 2 * PI * pr,
twist = 360*thickness*tan(helical)/circum, twist = 360*thickness*tan(helical)/circum,
slices = default(slices, ceil(twist/360*segs(pr)+1)), slices = default(slices, ceil(abs(twist)/360*segs(pr)+1)),
rgn = spur_gear2d( rgn = spur_gear2d(
circ_pitch = circ_pitch, circ_pitch = circ_pitch,
teeth = teeth, teeth = teeth,
@ -1437,7 +1437,7 @@ module ring_gear(
: 2*ar - rr; // default case : 2*ar - rr; // default case
circum = 2 * PI * pr; circum = 2 * PI * pr;
twist = 360*thickness*tan(-helical)/circum; twist = 360*thickness*tan(-helical)/circum;
slices = default(slices, ceil(twist/360*segs(pr)+1)); slices = default(slices, ceil(abs(twist)/360*segs(pr)+1));
attachable(anchor,spin,orient, h=thickness, r=atype=="outside"?or:pr) { attachable(anchor,spin,orient, h=thickness, r=atype=="outside"?or:pr) {
zrot(gear_spin) zrot(gear_spin)
if (herringbone) { if (herringbone) {