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Update 'bushing.jscad'

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Timothy Farrell 2021-06-25 08:32:31 -05:00
parent d16190879d
commit ae9d42a855
1 changed files with 48 additions and 31 deletions
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bushing.jscad
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@ -2,9 +2,15 @@
// author : Tim Farrell
// license : MIT License
// revision : 3
// tags : Rubber
// tags : TPU
// file : bushing.jscad
const { polygon, cylinder, torus } = require('@jscad/modeling').primitives;
const { extrudeLinear } = require('@jscad/modeling').extrusions;
const { translate, rotateZ } = require('@jscad/modeling').transforms;
const { subtract, union } = require('@jscad/modeling').booleans
function getParameterDefinitions () {
return [
{name: 'overhang', type: 'float', initial: 7, min: 1, max: 40, step: 1, caption: 'Overhang'},
@ -24,26 +30,34 @@ function knurling(p) {
const bushing_radius = p.bushing_diameter / 2;
const thread_radius = bushing_radius * 0.72
const twist_angle = 45;
const overlap = 2;
const overlap = 1;
const twist = twist_angle * p.bushing_height / thread_radius;
const threads = 360 / twist_angle * overlap;
const triangle = polygon([
const square = polygon({points: [
[thread_radius, thread_radius],
[0, thread_radius],
[0, 0],
[thread_radius, 0]
]);
]});
for (let i=0; i < threads; ++i) {
knurls.push(
linear_extrude({height: p.bushing_height, twist, slices: 30}, triangle)
.rotateZ(360 / threads * i)
.translate([0, 0, -p.bushing_height/2])
translate(
[0, 0, -p.bushing_height/2],
rotateZ(
2 * Math.PI * i / threads,
[extrudeLinear({height: p.bushing_height, twistAngle: twist, twistSteps: 120}, square)]
)
)
);
knurls.push(
linear_extrude({height: p.bushing_height, twist: -twist, slices: 30}, triangle)
.rotateZ(360 / threads * i)
.translate([0, 0, -p.bushing_height/2])
translate(
[0, 0, -p.bushing_height/2],
rotateZ(
2 * Math.PI * i / threads,
[extrudeLinear({height: p.bushing_height, twistAngle: -twist, twistSteps: 120}, square)]
)
)
);
}
return union(...knurls);
@ -54,17 +68,17 @@ function donut(p) {
const outer_radius = p.overhang + p.host_hole_diameter/2 - inner_radius;
const z_offset = p.bushing_height/2 - (p.bushing_height/2 - p.host_hole_height/2);
return union(
torus({ ri: inner_radius, ro: outer_radius }).translate([0, 0, z_offset]),
torus({ ri: inner_radius, ro: outer_radius }).translate([0, 0, -z_offset])
translate([0, 0, z_offset], torus({ innerRadius: inner_radius, outerRadius: outer_radius })),
translate([0, 0, -z_offset], torus({ innerRadius: inner_radius, outerRadius: outer_radius }))
);
}
function bushing_main(p) {
const outer_radius = p.overhang + p.host_hole_diameter/2;
const main_cylinder = cylinder({
r: outer_radius - (p.taper ? (p.bushing_height - p.host_hole_height) / 2 : 0),
h: p.bushing_height,
center: true
radius: outer_radius - (p.taper ? (p.bushing_height - p.host_hole_height) / 2 : 1),
height: p.bushing_height,
center: [0, 0, 0]
});
if (p.taper) {
return union(
@ -79,14 +93,14 @@ function host_hole(p) {
const inner_radius = p.host_hole_diameter/2;
const outer_radius = p.overhang + inner_radius;
return difference(
cylinder({r: outer_radius, h: p.host_hole_height, center: true}),
cylinder({r: inner_radius, h: p.host_hole_height, center: true})
return subtract(
cylinder({radius: outer_radius, height: p.host_hole_height, center: [0, 0, 0]}),
cylinder({radius: inner_radius, height: p.host_hole_height, center: [0, 0, 0]})
);
}
function bushing_sleeve(p) {
const sleeve = cylinder({r: p.bushing_diameter/2, h: p.bushing_height, center: true});
const sleeve = cylinder({radius: p.bushing_diameter/2, height: p.bushing_height, center: [0, 0, 0]});
if (p.knurling) {
return union(sleeve, knurling(p));
}
@ -94,9 +108,12 @@ function bushing_sleeve(p) {
}
function main(p) {
return difference(
return subtract(
bushing_main(p),
host_hole(p),
bushing_sleeve(p)
);
}
module.exports = { main, getParameterDefinitions }