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Fix for malformed ball screw.

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This commit is contained in:
Garth Minette 2021-06-24 01:08:25 -07:00
parent 6455634fd9
commit bf3278f6db
1 changed files with 9 additions and 3 deletions
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12
threading.scad
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@ -212,8 +212,8 @@ module trapezoidal_threaded_rod(
for (thread = [-threads/2:1:threads/2-1]) let(
tang = (thread/starts) * 360 + ang,
hsc = internal? 1 :
abs(tang) > twist/2? 0 :
(higang1==0 && higang2==0)? 1 :
(higang1==0 && tang<=0)? 1 :
(higang2==0 && tang>=0)? 1 :
lookup(tang, hig_table),
mat3 = affine3d_translate([thread, 0, 0]) *
affine3d_scale([1, hsc, 1]) *
@ -949,8 +949,13 @@ module ball_screw_rod(
bevel=false,
anchor, spin, orient
) {
n = ceil(segs(ball_diam/2)*ball_arc/2/360);
depth = ball_diam * (1-cos(ball_arc/2))/2;
profile = arc(N=11, d=ball_diam/pitch, cp=[0,ball_diam/2/pitch*cos(ball_arc/2)], start=270-ball_arc/2, angle=ball_arc);
cpy = ball_diam/2/pitch*cos(ball_arc/2);
profile = [
each arc(N=n, d=ball_diam/pitch, cp=[-0.5,cpy], start=270, angle=ball_arc/2),
each arc(N=n, d=ball_diam/pitch, cp=[+0.5,cpy], start=270-ball_arc/2, angle=ball_arc/2)
];
trapezoidal_threaded_rod(
d=d, l=l, pitch=pitch,
thread_depth=depth,
@ -960,6 +965,7 @@ module ball_screw_rod(
starts=starts,
bevel=bevel,
internal=internal,
higbee=0,
anchor=anchor,
spin=spin,
orient=orient