From c94aed4a63fb92bfb571ff4709646e7c1cfc14b0 Mon Sep 17 00:00:00 2001
From: Jan Huwald <jh@sotun.de>
Date: Thu, 22 Jan 2015 16:12:55 +0100
Subject: split shell in two parts for easier wall (de)mounting


diff --git a/gimbal.scad b/gimbal.scad
index c2404ca..4e1857a 100644
--- a/gimbal.scad
+++ b/gimbal.scad
@@ -76,7 +76,30 @@ module shell() {
     }
 }
 
-union() {
-shell();
+module shell_splitter()
+    assign(w1 = d + 2*c + e)
+    assign(w2 = mount_screw_head_dia + 2*c)
+    assign(h  = base + c)
+    translate([-w1/2, -w2/2, -h - d/2]) {
+	cube([w1, w2, 2/3*h+e]);
+	
+	rotate([90, 0, 90])
+	translate([w2/2, 2/3*h, 0])
+	cylinder(h=w1, r=w2/2);
+    }
+
+module shell_upper()
+    difference() {
+	shell();
+	translate([0, 0, -e]) shell_splitter();
+    }
+
+module shell_lower()
+  intersection() {
+	shell();
+	shell_splitter();
+    }
+
+translate([0, 0, -3*base]) shell_lower();
+shell_upper();
 translate([0,0,20]) rotate([90, 0, 90]) ball();
-}
-- 
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