From 48c53eceb74e1d3cae4a29912d9064b3ce6f2f90 Mon Sep 17 00:00:00 2001
From: Jan Huwald <jh@sotun.de>
Date: Thu, 22 Jan 2015 16:01:48 +0100
Subject: add grip holes on ball for easier movement


diff --git a/gimbal.scad b/gimbal.scad
index 88e8554..c2404ca 100644
--- a/gimbal.scad
+++ b/gimbal.scad
@@ -17,12 +17,27 @@ module screw() {
     cylinder(r=screw_dia/2, h=screw_len);
 }
 
+module grip()
+    for (i = [0:19])
+        rotate(i*360/20)
+	translate([d/2-3, 0, -5/2])
+	cube([3,2,5]);
+
 module ball()
     difference() {
 	sphere(d/2);
 	translate([0, 0, d/2 - cutoff - screw_len + e]) screw();
 	for (i = [-1,1])
             translate([0, 0, i * (d - cutoff)]) cube(d, center=true);
+
+	// horizontal grip
+	grip();
+	// vertical grip at the upper half sphere (but not at the top)
+	difference() {
+	    rotate([90, -5, 0]) grip();
+	    cylinder(r1=0, r2=sqrt(pow(d/2, 2) - pow(d/2-cutoff, 2)), h=d/2-cutoff);
+	    translate([0, 0, -d+4]) cylinder(r=d/2, h=d);
+	}
     }
 
 module shell() {
-- 
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