Added stepper motors and motor mounts

stock_parts.scad

@@ -1,18 +1,10 @@
-stock_color = "lightgray";
+stock_color = "#aaa4";
 
 bushing_od = 12;
 bushing_id = 8;
 bushing_len = 8;
 
-module bushing() {
-  colorize(stock_color) {
-    difference() {
-      cylinder(d = bushing_od, h = bushing_len);
-      translate([0,0,-1])
-	cylinder(d = bushing_id, h = bushing_len + 2);
-    }
-  }
-}
+nema17_face = 42.3;
 
 module colorize(colorname) {
   if (use_colors) {
@@ -21,3 +13,41 @@ module colorize(colorname) {
     children();
   }
 }
+
+module bushing() {
+  colorize(stock_color) render() {
+    difference() {
+      cylinder(d = bushing_od, h = bushing_len);
+      translate([0,0,-1])
+	cylinder(d = bushing_id, h = bushing_len + 2);
+    }
+  }
+}
+
+// located with the shaft in +z, face on the XY plane 
+module nema17(depth = 23.5) {
+  face = 42.3;
+  screw_pitch = 31 / 2;
+  color(stock_color)
+    render()
+  difference() {
+    union() {
+      translate([-face/2, -face/2, -depth])
+	cube([face, face, depth]);
+      translate([0,0,-1]) {
+	cylinder(d=22, h=2+1);
+	cylinder(d=5, h=22+1);
+      }
+    }
+    translate([1.25, -5, 4])
+      cube([10, 10, 20]);
+
+    // screw holes
+    for (x = [-screw_pitch, screw_pitch],
+	   y = [-screw_pitch, screw_pitch]) {
+      translate([x,y,-10])
+	cylinder(d=5,h=20);
+    }
+  }
+
+}