Add snap bolt

models/snap-bolt.js

@@ -0,0 +1,124 @@
+/** @import * as Replicad from 'replicad' */
+
+export const defaultParams = {
+  lengthInMm: 40,
+  snapThicknessInMm: 3,
+  snapLengthInMm: 2,
+  flexLengthInMm: 20,
+  flexWidthInMm: 3,
+  capDiameterInMm: 12.5,
+  capHeightInMm: 3.2,
+  holeDiameterInMm: 8,
+  holeMarginInMm: 0.5,
+  cornerRadiusInMm: 1,
+}
+
+/**
+ * @param {typeof defaultParams} params
+ */
+export default function main(params) {
+  const {} = replicad
+  const {
+    lengthInMm,
+    snapLengthInMm,
+    snapThicknessInMm,
+    flexLengthInMm,
+    flexWidthInMm,
+    capDiameterInMm,
+    capHeightInMm,
+    holeDiameterInMm,
+    holeMarginInMm,
+    cornerRadiusInMm,
+  } = params
+
+  const pin =
+    /** @type {Replicad.Solid} */
+    (
+      createPin({
+        lengthInMm,
+        snapThicknessInMm,
+        snapLengthInMm,
+        flexLengthInMm,
+        flexWidthInMm,
+        holeDiameterInMm,
+        holeMarginInMm,
+        cornerRadiusInMm,
+      })
+    )
+
+  const cap =
+    /** @type {Replicad.Solid} */
+    (
+      createCap({
+        capDiameterInMm,
+        capHeightInMm,
+        snapThicknessInMm,
+      })
+    ).translateX(-capHeightInMm)
+
+  return pin.fuse(cap)
+}
+
+/**
+ * @param {object} options
+ * @param {number} options.capDiameterInMm
+ * @param {number} options.capHeightInMm
+ * @param {number} options.snapThicknessInMm
+ */
+function createCap(options) {
+  const { draw } = replicad
+  const { capDiameterInMm, capHeightInMm, snapThicknessInMm } = options
+
+  const capRadiusInMm = (1 / 2) * capDiameterInMm
+  const subtendedRadiusInMm = Math.sqrt(capRadiusInMm ** 2 - (snapThicknessInMm / 2) ** 2)
+
+  const profile = draw()
+    .lineTo([subtendedRadiusInMm, 0])
+    .ellipseTo([-subtendedRadiusInMm, 0], capRadiusInMm, capRadiusInMm, undefined, true, true)
+    .close()
+
+  return profile.sketchOnPlane('YZ').extrude(capHeightInMm)
+}
+
+/**
+ * @param {object} options
+ * @param {number} options.lengthInMm
+ * @param {number} options.snapLengthInMm
+ * @param {number} options.snapThicknessInMm
+ * @param {number} options.flexLengthInMm
+ * @param {number} options.flexWidthInMm
+ * @param {number} options.holeDiameterInMm
+ * @param {number} options.holeMarginInMm
+ * @param {number} options.cornerRadiusInMm
+ */
+function createPin(options) {
+  const { draw } = replicad
+  const {
+    lengthInMm,
+    snapLengthInMm,
+    snapThicknessInMm,
+    flexLengthInMm,
+    flexWidthInMm,
+    holeDiameterInMm,
+    holeMarginInMm,
+    cornerRadiusInMm,
+  } = options
+
+  const sideWidth = (1 / 2) * holeDiameterInMm - holeMarginInMm
+
+  const profile = draw()
+    .lineTo([0, sideWidth])
+    .lineTo([lengthInMm, sideWidth])
+    .customCorner((1 / 3) * cornerRadiusInMm)
+    .lineTo([lengthInMm, sideWidth + snapLengthInMm])
+    .customCorner((1 / 3) * cornerRadiusInMm)
+    .lineTo([lengthInMm + (1 / 3) * snapLengthInMm, sideWidth + snapLengthInMm])
+    .customCorner(cornerRadiusInMm)
+    .lineTo([lengthInMm + snapLengthInMm, (1 / 2) * flexWidthInMm])
+    .customCorner(cornerRadiusInMm)
+    .lineTo([lengthInMm - flexLengthInMm, (1 / 2) * flexWidthInMm])
+    .tangentArcTo([lengthInMm - flexLengthInMm - (1 / 2) * flexWidthInMm, 0])
+    .closeWithMirror()
+
+  return profile.sketchOnPlane('XY').extrude(snapThicknessInMm)
+}