103 lines
3.3 KiB
JavaScript
103 lines
3.3 KiB
JavaScript
/// title : Basic Sleeved Rubber Bushing
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// author : Tim Farrell
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// license : MIT License
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// revision : 3
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// tags : Rubber
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// file : bushing.jscad
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function getParameterDefinitions () {
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return [
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{name: 'overhang', type: 'float', initial: 7, min: 1, max: 40, step: 1, caption: 'Overhang'},
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{name: 'host_hole_diameter', type: 'float', initial: 13, min: 1, max: 40, step: 1, caption: 'Host hole diameter'},
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{name: 'host_hole_height', type: 'float', initial: 0.8, caption: 'Host hole height'},
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{name: 'bushing_height', type: 'float', initial: 4, min: 1, max: 40, step: 1, caption: 'Bushing height'},
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{name: 'bushing_diameter', type: 'float', initial: 10, min: 1, max: 40, step: 1, caption: 'Bushing diameter'},
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{name: 'taper', type: 'checkbox', checked: true, caption: 'Taper Edges?'},
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{name: 'knurling', type: 'checkbox', checked: false, caption: 'Add knurling?'}
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];
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}
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function knurling(p) {
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const knurls = [];
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const bushing_radius = p.bushing_diameter / 2;
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const thread_radius = bushing_radius * 0.72
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const twist_angle = 45;
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const overlap = 2;
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const twist = twist_angle * p.bushing_height / thread_radius;
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const threads = 360 / twist_angle * overlap;
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const triangle = polygon([
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[thread_radius, thread_radius],
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[0, thread_radius],
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[0, 0],
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[thread_radius, 0]
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]);
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for (let i=0; i < threads; ++i) {
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knurls.push(
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linear_extrude({height: p.bushing_height, twist, slices: 30}, triangle)
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.rotateZ(360 / threads * i)
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.translate([0, 0, -p.bushing_height/2])
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);
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knurls.push(
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linear_extrude({height: p.bushing_height, twist: -twist, slices: 30}, triangle)
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.rotateZ(360 / threads * i)
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.translate([0, 0, -p.bushing_height/2])
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);
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}
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return union(...knurls);
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}
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function donut(p) {
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const inner_radius = (p.bushing_height - p.host_hole_height) / 2;
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const outer_radius = p.overhang + p.host_hole_diameter/2 - inner_radius;
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const z_offset = p.bushing_height/2 - (p.bushing_height/2 - p.host_hole_height/2);
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return union(
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torus({ ri: inner_radius, ro: outer_radius }).translate([0, 0, z_offset]),
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torus({ ri: inner_radius, ro: outer_radius }).translate([0, 0, -z_offset])
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);
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}
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function bushing_main(p) {
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const outer_radius = p.overhang + p.host_hole_diameter/2;
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const main_cylinder = cylinder({
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r: outer_radius - (p.taper ? (p.bushing_height - p.host_hole_height) / 2 : 0),
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h: p.bushing_height,
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center: true
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});
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if (p.taper) {
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return union(
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main_cylinder,
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donut(p)
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);
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}
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return main_cylinder;
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}
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function host_hole(p) {
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const inner_radius = p.host_hole_diameter/2;
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const outer_radius = p.overhang + inner_radius;
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return difference(
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cylinder({r: outer_radius, h: p.host_hole_height, center: true}),
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cylinder({r: inner_radius, h: p.host_hole_height, center: true})
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);
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}
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function bushing_sleeve(p) {
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const sleeve = cylinder({r: p.bushing_diameter/2, h: p.bushing_height, center: true});
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if (p.knurling) {
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return union(sleeve, knurling(p));
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}
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return sleeve;
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}
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function main(p) {
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return difference(
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bushing_main(p),
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host_hole(p),
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bushing_sleeve(p)
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);
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}
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