Initial commit

.gitmodules

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+[submodule "scad/common"]
+	path = scad/common
+	url = https://git.sixteenmillimeter.com/modules/common.git

README.md

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+# Knobs
+
+This repo contains a parametric knob generator for quickly generating tactile knobs for standard metric bolts.
+
+## Example
+
+```scad
+use <./scad/knob.scad>;
+
+knob(H = 10, D = 14, DEPTH = 4, BOLT = "M4", TYPE = "hex");
+
+```
+
+This will generate a knob that is 10mm high, has a diameter of 14m and takes an M4 hex bolt that sits 4mm from the bottom.
+An M4 bolt can be dropped in, or an M4 nut.

scad.sh

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+#!/bin/bash
+
+bash ./scad/common/scad.sh ./scad/knob.scad

scad/common

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+Subproject commit e2eeb27f173d739a174c0d147bcb62a16859e2d9

scad/knob.scad

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+use <./common/common.scad>
+use <./common/Triangles.scad>;
+
+module knob (H = 12, D = 24, DEPTH = 4, BOLT = "M4", TYPE = "hex") {
+	NOTCH = 1;
+	N = ceil(D * 3.14 / 1.5);
+	BOT = 12;
+	BOT_H = 2;
+	THICKNESS = 4.25;
+	ID = D - THICKNESS;
+    supported = true;
+	echo(N);
+    
+	difference() {
+		union () {
+			cylinder(r = D / 2, h = H, center = true, $fn = 360);
+			translate([0, 0, -(H / 2) - (BOT_H / 2)]) {
+                cylinder(r = BOT / 2, h = 2, center = true, $fn = 360);
+            }
+		}
+        if (BOLT == "M3") {
+            cylinder(r = 3.1 / 2, h = H * 2, center = true, $fn = 60);
+        } else if (BOLT == "M4") {
+            cylinder(r = 4.25 / 2, h = H * 2, center = true, $fn = 60);
+        } else if (BOLT == "M5") {
+            cylinder(r = 5.1 / 2, h = H * 2, center = true, $fn = 60);
+        } else {
+            supported = false;
+        }
+        assert(supported, "Bolt size not supported!");
+
+		//hollow inner cylinder
+		translate([0, 0, DEPTH]) cylinder(r = ID / 2, h = H, center = true, $fn = 360);
+        if (BOLT == "M4" && TYPE == "hex") {
+            translate([0, 0, -(H / 2) + DEPTH - 1.4]) m4_nut();
+        } else if (BOLT == "M5" && TYPE == "hex" ) {
+            translate([0, 0, -(H / 2) + DEPTH - 1.4]) m5_nut();
+        } else if (BOLT == "M5" && TYPE == "socket") {
+            translate([0, 0, -(H / 2) + DEPTH - 1.4]) m5_bolt();
+        }
+
+		//grips
+		for(i = [0 : N]) {
+			rotate([0, 0, i * (360 / N)]) {
+                translate([D / 2.87, D / 2.87, 0]) {
+                    Right_Angled_Triangle(a = NOTCH, b = NOTCH, height = 22, centerXYZ=[true, true, true]);
+                }
+            }
+		}
+		//taper top
+		translate([0, 0, H / 2 - 0.7]) difference () {
+			cylinder(r = D / 2 + 2, h = 2, center = true, $fn = 360);
+			cylinder(r1 = D / 2 + 1, r2 = D / 2 - 1, h = 2.01, center = true, $fn = 360);
+		}
+		//taper bottom
+		translate([0, 0, -H / 2 + 0.7]) difference () {
+			cylinder(r = D / 2 + 2, h = 2, center = true, $fn = 360);
+			cylinder(r2 = D / 2 + 1, r1 = D / 2 - 1, h = 2.01, center = true, $fn = 360);
+		}
+	}
+
+}
+
+PART = "m4_hex_10h_14d";
+
+if (PART == "m4_hex_10h_14d") {
+	knob(H = 10, D = 14, DEPTH = 4, BOLT = "M4", TYPE = "hex");
+}