Uit Hack42
ratchet.scad
module tooth(base, height, tipl, tiph, width) {
difference() {
intersection() {
translate([-(base+tipl)/2,0,0]) cube([base+tipl,height,width], center = false);
scale(v=[1,(height/(base+tipl))*2,0]) cylinder(r=(base+tipl)/2,h=width, $fs=0.01);
}
translate([-(base/2+tipl/2),0,0])
polyhedron( points = [ [0,0,0],[0,0,width],[0,tiph,0],[0,tiph,width],[tipl,0,0],[tipl,0,width] ],
triangles = [ [1,3,5],[0,4,2],[0,2,1],[2,3,1],[0,1,4],[4,1,5],[2,4,5],[2,5,3] ]);
}
}
//tooth2(7,7,5,5,1);
module ratchet(diam, nrteeth, height, tipl, tiph, width) {
//moves teeth down by this distance
down = 0.01 + (diam - diam * cos(180/nrteeth));
//make sure tooth's height is not lower than down movement
if (height <= down) {
ratchet2(diam, nrteeth, down, tipl, tiph, width, down);
} else {
ratchet2(diam, nrteeth, height, tipl, tiph, width, down);
}
}
module ratchet2(diam, nrteeth, height, tipl, tiph, width, down) {
// calculate tooth's base
base = 2 * sin(180/nrteeth) * diam;
union() {
cylinder(h=width,r=diam);
//teeth
for ( i = [0 : (nrteeth-1)] ) {
rotate( i * 360 / nrteeth, [0, 0, 1])
translate([-(0.25*base), (diam-2*down), 0]) // check the .25
tooth(base, height, tipl, tiph, width);
}
}
}
ratchet(10,6,3,5,7,1);
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