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Tweaked z_sled to reduce friction.

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Revar Desmera
2015-06-29 18:23:59 -07:00
parent 185d6d91e0
commit 64ec77c6fb
27 changed files with 67687 additions and 193894 deletions
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64
acme_screw.scad
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@@ -2,32 +2,62 @@ include <config.scad>
use <GDMUtils.scad>
// Constructs an acme threaded screw rod. This method makes much
// smoother threads than the naive linear_extrude method.
module acme_threaded_rod(
d=10.5,
l=100,
threading=3.175,
thread_depth=1
) {
r = d/2;
twists = l/threading;
linear_extrude(
height=l,
convexity=20,
twist=-360*twists,
slices=12*twists,
center=true
) {
astep = 360/segs(d/2);
asteps = ceil(360/astep);
threads = ceil(l/threading)+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))),
a = astep / asteps,
rx = r * cos(360 * a),
ry = r * sin(360 * a),
tz = (thread + a - threads/2 + (i<2? -0.25 : 0.25)) * threading
) [rx, ry, tz]
];
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(
p0 = (thread*asteps + astep)*4 + j,
p1 = p0 + 4,
p2 = (thread*asteps + astep)*4 + ((j+1)%4),
p3 = p2 + 4,
tri = (i==0? [p0, p3, p1] : [p0, p2, p3])
)
if (p0 < point_count-4) tri
],
[
[0, 3, 2],
[0, 2, 1],
[point_count-4, point_count-3, point_count-2],
[point_count-4, point_count-2, point_count-1]
]
);
intersection() {
union() {
circle(r=r-thread_depth, center=true);
difference() {
circle(r=r, center=true);
translate([r/2, 0]) {
square([r, r*2], center=true);
}
}
polyhedron(points=poly_points, faces=poly_faces, convexity=10);
cylinder(h=(threads+0.5)*threading, d=d-2*thread_depth, center=true);
}
cube([d+1, d+1, l], center=true);
}
}
//!acme_threaded_rod(d=20, l=20, threading=10, thread_depth=5);
module acme_threaded_nut(
@@ -40,7 +70,7 @@ module acme_threaded_nut(
) {
difference() {
cylinder(r=od/2/cos(30), h=h, center=true, $fn=6);
grid_of(za=[-slop/2,slop/2]) {
zspread(slop) {
acme_threaded_rod(d=id+2*slop, l=h+1, threading=threading, thread_depth=thread_depth);
}
}