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Significantly improved ACME threading profiles.

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Revar Desmera
2017-03-21 17:13:11 -07:00
parent 106d09780d
commit 60d0735dfb
1 changed files with 10 additions and 8 deletions
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18
acme_screw.scad
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@@ -14,14 +14,14 @@ module acme_threaded_rod(
astep = 360/segs(d/2);
asteps = ceil(360/astep);
threads = ceil(l/pitch)+2;
pa_delta = (thread_depth*1.25)*sin(thread_angle)/2;
pa_delta = min(pitch/4.1,(thread_depth+0.05)*tan(thread_angle)/2);
poly_points = [
for (
thread = [0 : threads-1],
astep = [0 : asteps-1],
i = [0 : 3]
) let (
r = max(0, d/2 - ((i==1||i==2)? 0 : (thread_depth*1.25))),
r = max(0, d/2 - ((i==1||i==2)? 0 : (thread_depth+0.05))),
a = astep / asteps,
rx = r * cos(360 * a),
ry = r * sin(360 * a),
@@ -31,11 +31,12 @@ module acme_threaded_rod(
point_count = len(poly_points);
poly_faces = concat(
[
for (thread = [0 : threads-1])
for (astep = [0 : asteps-1])
for (j = [0 : 3])
for (i = [0 : 1])
let(
for (
thread = [0 : threads-1],
astep = [0 : asteps-1],
j = [0 : 3],
i = [0 : 1]
) let(
p0 = (thread*asteps + astep)*4 + j,
p1 = p0 + 4,
p2 = (thread*asteps + astep)*4 + ((j+1)%4),
@@ -54,12 +55,13 @@ module acme_threaded_rod(
intersection() {
union() {
polyhedron(points=poly_points, faces=poly_faces, convexity=10);
cylinder(h=(threads+0.5)*pitch, d=d-2*thread_depth, center=true);
cylinder(h=(threads+0.5)*pitch, d=d-2*thread_depth, center=true, $fn=asteps);
}
cube([d+1, d+1, l], center=true);
}
}
//!acme_threaded_rod(d=3/8*25.4, l=20, pitch=1/8*25.4, thread_depth=1.3, thread_angle=29, $fn=32);
//!acme_threaded_rod(d=60, l=16, pitch=8, thread_depth=3, thread_angle=45, $fa=2, $fs=2);
module acme_threaded_nut(