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Fix ball screw to force 3 pts in arcs

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This commit is contained in:
Adrian Mariano 2021-09-04 23:14:51 -04:00
parent 4555ca1daa
commit 468b3f6682
1 changed files with 4 additions and 4 deletions
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8
threading.scad
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@ -769,11 +769,11 @@ module square_threaded_nut(
// orient = Vector to rotate top towards, after spin. See [orient](attachments.scad#orient). Default: `UP`
// $slop = The printer-specific slop value, which adds clearance (`4*$slop`) to internal threads.
// Example(2D): Thread Profile, ball_diam=4, ball_arc=100
// projection(cut=true) ball_screw_rod(d=10, l=15, pitch=5, ball_diam=4, ball_arc=100, orient=BACK);
// projection(cut=true) ball_screw_rod(d=10, l=15, pitch=5, ball_diam=4, ball_arc=100, orient=BACK, $fn=24);
// Example(2D): Thread Profile, ball_diam=4, ball_arc=120
// projection(cut=true) ball_screw_rod(d=10, l=15, pitch=5, ball_diam=4, ball_arc=120, orient=BACK);
// projection(cut=true) ball_screw_rod(d=10, l=15, pitch=5, ball_diam=4, ball_arc=120, orient=BACK, $fn=24);
// Example(2D): Thread Profile, ball_diam=3, ball_arc=120
// projection(cut=true) ball_screw_rod(d=10, l=15, pitch=5, ball_diam=3, ball_arc=120, orient=BACK);
// projection(cut=true) ball_screw_rod(d=10, l=15, pitch=5, ball_diam=3, ball_arc=120, orient=BACK, $fn=24);
// Examples(Med):
// ball_screw_rod(d=15, l=20, pitch=8, ball_diam=5, ball_arc=120, $fa=1, $fs=1);
// ball_screw_rod(d=15, l=20, pitch=5, ball_diam=4, ball_arc=120, $fa=1, $fs=1);
@ -787,7 +787,7 @@ module ball_screw_rod(
bevel,bevel1,bevel2,
anchor, spin, orient
) {
n = ceil(segs(ball_diam/2)*ball_arc/2/360);
n = max(3,ceil(segs(ball_diam/2)*ball_arc/2/360));
depth = ball_diam * (1-cos(ball_arc/2))/2;
cpy = ball_diam/2/pitch*cos(ball_arc/2);
profile = [