missing .scad

README.md

@@ -13,3 +13,9 @@ old, printable carriages were using something similar)
 M3 stock screws (4.5mm holes for them to turn freely)
 
 no bearings, so very crude, but printable without supports
+
+# wrist_hillberry
+
+more info on that later
+gearModule.scad is not mine, but I honestly don't remember the
+source, if I find it I'll cite it right away

gearModule.scad

@@ -0,0 +1,33 @@
+module tooth(width, thickness, height)
+{
+    scale([width/5,thickness/5,height/10])
+    {
+        difference()
+        {
+            translate([-2.5,0,0])
+                cube([5,5,10]);
+            translate([5+1.25-2.5,0-1,0])
+                rotate([0,-14.0362434,0])
+                    cube([5,5+2,12]);
+            translate([0-1.25-2.5,0+5+1,0])
+                rotate([0,-14.0362434,180])
+                    cube([5,5+2,12]);
+        }
+    }
+}
+
+module gear(toothNo, toothWidth, toothHeight, thickness)
+{
+    radius = (toothWidth*1.7*toothNo)/3.141592653589793238/2;
+    rotate([-90,0,0])
+        union()
+        {
+            for(i=[0:toothNo])
+                rotate([0,(360/toothNo)*i,0])
+                    translate([0,0,radius-0.5])
+                        tooth(toothWidth,thickness,toothHeight);
+            translate([0,thickness,0])
+                rotate([90,0,0])
+                    cylinder(r=radius, h=thickness);
+        }
+}