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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 // author : Tim Farrell
// license : MIT License // license : MIT License
// revision : 3 // revision : 3
// tags : Rubber // tags : TPU
// file : bushing.jscad // 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 () { function getParameterDefinitions () {
return [ return [
{name: 'overhang', type: 'float', initial: 7, min: 1, max: 40, step: 1, caption: 'Overhang'}, {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 bushing_radius = p.bushing_diameter / 2;
const thread_radius = bushing_radius * 0.72 const thread_radius = bushing_radius * 0.72
const twist_angle = 45; const twist_angle = 45;
const overlap = 2; const overlap = 1;
const twist = twist_angle * p.bushing_height / thread_radius; const twist = twist_angle * p.bushing_height / thread_radius;
const threads = 360 / twist_angle * overlap; const threads = 360 / twist_angle * overlap;
const triangle = polygon([ const square = polygon({points: [
[thread_radius, thread_radius], [thread_radius, thread_radius],
[0, thread_radius], [0, thread_radius],
[0, 0], [0, 0],
[thread_radius, 0] [thread_radius, 0]
]); ]});
for (let i=0; i < threads; ++i) { for (let i=0; i < threads; ++i) {
knurls.push( knurls.push(
linear_extrude({height: p.bushing_height, twist, slices: 30}, triangle) translate(
.rotateZ(360 / threads * i) [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( knurls.push(
linear_extrude({height: p.bushing_height, twist: -twist, slices: 30}, triangle) translate(
.rotateZ(360 / threads * i) [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); return union(...knurls);
@ -54,17 +68,17 @@ function donut(p) {
const outer_radius = p.overhang + p.host_hole_diameter/2 - inner_radius; 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); const z_offset = p.bushing_height/2 - (p.bushing_height/2 - p.host_hole_height/2);
return union( return union(
torus({ ri: inner_radius, ro: outer_radius }).translate([0, 0, z_offset]), translate([0, 0, z_offset], torus({ innerRadius: inner_radius, outerRadius: outer_radius })),
torus({ ri: inner_radius, ro: outer_radius }).translate([0, 0, -z_offset]) translate([0, 0, -z_offset], torus({ innerRadius: inner_radius, outerRadius: outer_radius }))
); );
} }
function bushing_main(p) { function bushing_main(p) {
const outer_radius = p.overhang + p.host_hole_diameter/2; const outer_radius = p.overhang + p.host_hole_diameter/2;
const main_cylinder = cylinder({ const main_cylinder = cylinder({
r: outer_radius - (p.taper ? (p.bushing_height - p.host_hole_height) / 2 : 0), radius: outer_radius - (p.taper ? (p.bushing_height - p.host_hole_height) / 2 : 1),
h: p.bushing_height, height: p.bushing_height,
center: true center: [0, 0, 0]
}); });
if (p.taper) { if (p.taper) {
return union( return union(
@ -79,14 +93,14 @@ function host_hole(p) {
const inner_radius = p.host_hole_diameter/2; const inner_radius = p.host_hole_diameter/2;
const outer_radius = p.overhang + inner_radius; const outer_radius = p.overhang + inner_radius;
return difference( return subtract(
cylinder({r: outer_radius, h: p.host_hole_height, center: true}), cylinder({radius: outer_radius, height: p.host_hole_height, center: [0, 0, 0]}),
cylinder({r: inner_radius, h: p.host_hole_height, center: true}) cylinder({radius: inner_radius, height: p.host_hole_height, center: [0, 0, 0]})
); );
} }
function bushing_sleeve(p) { 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) { if (p.knurling) {
return union(sleeve, knurling(p)); return union(sleeve, knurling(p));
} }
@ -94,9 +108,12 @@ function bushing_sleeve(p) {
} }
function main(p) { function main(p) {
return difference( return subtract(
bushing_main(p), bushing_main(p),
host_hole(p), host_hole(p),
bushing_sleeve(p) bushing_sleeve(p)
); );
} }
module.exports = { main, getParameterDefinitions }