Add Bushing

bushing.jscad

@@ -0,0 +1,56 @@
+/// title      : Basic Sleeved Rubber Bushing
+// author     : Tim Farrell
+// license    : MIT License
+// revision   : 2
+// tags       : Rubber
+// file       : bushing.jscad
+
+function getParameterDefinitions () {
+  return [
+    {name: 'overhang', type: 'float', initial: 7, min: 1, max: 40, step: 1, caption: 'Overhang'},
+    {name: 'host_hole_diameter', type: 'float', initial: 13, min: 1, max: 40, step: 1, caption: 'Host hole diameter'},
+    {name: 'host_hole_height', type: 'float', initial: 0.8, caption: 'Host hole height'},
+    {name: 'bushing_height', type: 'float', initial: 4, min: 1, max: 40, step: 1, caption: 'Bushing height'},
+    {name: 'bushing_diameter', type: 'float', initial: 10, min: 1, max: 40, step: 1, caption: 'Bushing diameter'}
+  ];
+}
+
+
+function donut(p) {
+    const outer_radius = p.overhang + p.host_hole_diameter/2 - p.bushing_height/2;
+    const inner_radius = p.bushing_height/2;
+    return torus({ ri: inner_radius, ro: outer_radius });
+}
+
+function bushing_main(p) {
+    return union(
+        cylinder({
+            r: p.overhang + p.host_hole_diameter/2 - p.bushing_height/2,
+            h: p.bushing_height,
+            center: true
+        }),
+        donut(p)
+    );
+}
+
+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})
+    );
+}
+
+function bushing_sleeve(p) {
+    return cylinder({r: p.bushing_diameter/2, h: p.bushing_height, center: true});
+}
+
+function main(p) {
+    return difference(
+        bushing_main(p),
+        host_hole(p),
+        bushing_sleeve(p)
+    )
+}