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bar_width = 4;
bar_height = 20;
rod_rad = 5;
rod_bury = 10; // how deep the rod sticks in its retainer
clamp_thick = 5;
clamp_l1 = 10;
clamp_l2 = 50;
strut_height = bar_height;
strut_thick = 3;
angle = 30; // fake value; TODO
clamp_width = 2 * clamp_thick + bar_width;
clamp_height = bar_height + clamp_thick;
clamp_length = clamp_l2 - clamp_l1;
module strut(num, r1, r2, h) {
a = 360 / num;
b = a - 90;
d = clamp_width/2;
linear_extrude(h) polygon([
[r1, d], [r2, d],
[cos(a)*r2 + cos(b)*d, sin(a)*r2 + sin(b)*d],
[cos(a)*r1 + cos(b)*d, sin(a)*r1 + sin(b)*d]]);
}
module clamp() {
l = clamp_l2 - clamp_l1;
r = clamp_thick/2;
difference() {
translate([clamp_l1, -clamp_width/2, 0])
cube([l, clamp_width, clamp_height]);
translate([0, -bar_width/2, clamp_thick + clamp_l2 * sin(angle)])
rotate([0, angle, 0])
cube([2*l, bar_width, 2*bar_height]);
for (i = [-1, 1])
translate([0, -i * (clamp_thick + bar_width/2), clamp_height - clamp_thick/2])
rotate([0, 90, 0])
# linear_extrude(clamp_length*2)
polygon([[r,0], [r, i*r], [0, 0]]);
}
}
module rod_retainer(h) {
$fs = 0.1;
difference() {
union() {
cylinder(h=h, r=rod_rad + strut_thick);
translate([0, -strut_thick/2, 0])
cube([clamp_l1, strut_thick, h]);
}
translate([0, 0, max(strut_thick, h - rod_bury)])
cylinder(h=h, r=rod_rad);
}
}
module con(num) {
for (i = [0:num-1])
rotate(i*360/num) {
clamp();
strut(num, clamp_l1, clamp_l1 + strut_thick, strut_height);
strut(num, clamp_l2, clamp_l2 - strut_height, strut_thick);
strut(num, clamp_l2, clamp_l2 - strut_thick, strut_height);
}
rod_retainer(max(clamp_thick, clamp_length * sin(angle)));
}
con(3);
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