sprocketed_roller/sprocketed_roller.scad

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include <./common/common.scad>;
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FN = 100;
$fn = FN;
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SprocketBaseD = 19.05; //8 frames
SprocketBaseH = 2.7;
SprocketH = 10;
SprocketW = 0.79;
SprocketL = 1.3;
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SprocketAngle = 7;
SprocketAngleZ = 1.5;
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InnerD = 13.98;
InnerH = 10.6;
TopBaseD = 18.47;
TopBaseH = 2.96;
LipD = 18.84;
LipH = 0.33;
TopD = 21.66;
TopH = 1.4;
HollowD = 4.7;
HollowBaseD = 12.01;
HollowBaseH = 6.09;
module sprocket (pos = [0, 0, 0], rot = [0, 0, 0], bevel = false) {
//cube([SprocketL, SprocketW, SprocketH], center = true);
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$fn = 50;
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translate (pos) rotate(rot) {
difference () {
translate([0, 0, 0]) scale([1, 1, 2.25]) rotate([90, 0, 90]) cylinder(r = SprocketW/2, h = SprocketL, center = true);
translate([0, 0, -1]) cube([2, 2, 2], center = true);
if (bevel) {
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translate([SprocketAngleZ, 0, 0]) rotate([0, -SprocketAngle, 0]) cube([2, 2, 3], center = true);
translate([-SprocketAngleZ, 0, 0]) rotate([0, SprocketAngle, 0]) cube([2, 2, 3], center = true);
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}
}
}
}
module sprocketed_roller (pos = [0, 0, 0], bevel = false) {
SoundtrackH = (TopBaseH / 2) + InnerH + (SprocketBaseH / 2);
translate(pos) {
difference () {
union () {
//sprocket base
cylinder(r = R(SprocketBaseD), h = SprocketBaseH, center = true);
//center
translate([0, 0, (InnerH / 2) + (SprocketBaseH / 2)]) cylinder(r = R(InnerD), h = InnerH, center = true);
//soundtrack area
translate([0, 0, SoundtrackH]) cylinder(r = R(TopBaseD), h = TopBaseH, center = true);
translate([0, 0, SoundtrackH - (TopBaseH / 2) + (LipH / 2)]) cylinder(r = R(LipD), h = LipH, center = true);
translate([0, 0, SoundtrackH + (TopBaseH / 2) - (LipH / 2)]) cylinder(r = R(LipD), h = LipH, center = true);
translate([0, 0, SoundtrackH + (TopH / 2) + (TopBaseH / 2) - (LipH / 2)]) cylinder(r = R(TopD), h = TopH, center = true);
}
cylinder(r = HollowD / 2, h = 100, center = true);
translate([0, 0, (HollowBaseH / 2) - (SprocketBaseH / 2)]) cylinder(r = R(HollowBaseD), h = HollowBaseH + 0.1, center = true);
}
for (i = [0: 8]) {
rotate([0, 0, i * 360 / 8]) sprocket([(SprocketBaseD / 2) -.01, 0, (SprocketBaseH / 2) - (SprocketL / 2)], [0, 90, 0], bevel);
}
}
}
sprocketed_roller( bevel = true);