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69 lines
2.1 KiB
OpenSCAD
69 lines
2.1 KiB
OpenSCAD
//
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// Mendel90
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//
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// GNU GPL v2
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// nop.head@gmail.com
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// hydraraptor.blogspot.com
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//
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// Springs
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//
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extruder_spring = [ 7, 1, 10, 5];
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hob_spring = [12, 0.75, 10, 6];
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function spring_od(type) = type[0];
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function spring_gauge(type) = type[1];
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function spring_length(type) = type[2];
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function spring_coils(type) = type[3];
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// taken from openscad example 20
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module coil(r1 = 100, r2 = 10, h = 100, twists)
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{
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hr = h / (twists * 2);
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stepsize = 1/16;
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module segment(i1, i2) {
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alpha1 = i1 * 360*r2/hr;
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alpha2 = i2 * 360*r2/hr;
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len1 = sin(acos(i1*2-1))*r2;
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len2 = sin(acos(i2*2-1))*r2;
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if (len1 < 0.01)
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polygon([
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[ cos(alpha1)*r1, sin(alpha1)*r1 ],
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[ cos(alpha2)*(r1-len2), sin(alpha2)*(r1-len2) ],
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[ cos(alpha2)*(r1+len2), sin(alpha2)*(r1+len2) ]
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]);
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if (len2 < 0.01)
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polygon([
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[ cos(alpha1)*(r1+len1), sin(alpha1)*(r1+len1) ],
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[ cos(alpha1)*(r1-len1), sin(alpha1)*(r1-len1) ],
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[ cos(alpha2)*r1, sin(alpha2)*r1 ],
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]);
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if (len1 >= 0.01 && len2 >= 0.01)
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polygon([
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[ cos(alpha1)*(r1+len1), sin(alpha1)*(r1+len1) ],
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[ cos(alpha1)*(r1-len1), sin(alpha1)*(r1-len1) ],
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[ cos(alpha2)*(r1-len2), sin(alpha2)*(r1-len2) ],
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[ cos(alpha2)*(r1+len2), sin(alpha2)*(r1+len2) ]
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]);
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}
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linear_extrude(height = h, twist = 180*h/hr,
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$fn = (hr/r2)/stepsize, convexity = 5) {
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for (i = [ stepsize : stepsize : 1+stepsize/2 ])
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segment(i-stepsize, min(i, 1));
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}
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}
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module comp_spring(type, l = 0) {
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l = (l == 0) ? spring_length(type) : l;
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vitamin(str("SPR", spring_od(type), spring_gauge(type) * 100, type[2],
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": Spring ", spring_od(type), "mm OD x ", spring_gauge(type), "mm gauge x ", spring_length(type), "mm length" ));
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color(spring_color) render()
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coil(r1 = (spring_od(type) - spring_gauge(type)) / 2, r2 = spring_gauge(type) / 2, h = l, twists = spring_coils(type));
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}
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//comp_spring(extruder_spring);
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