From 312276b1830274d007feaf488fe21f8cfdf03f09 Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Thu, 29 Oct 2015 19:47:03 +0000
Subject: [PATCH] led-panel-ceiling-bracket: wip

---
 led-panel-ceiling-bracket.scad | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/led-panel-ceiling-bracket.scad b/led-panel-ceiling-bracket.scad
index a2e05ff..6e4b9b5 100644
--- a/led-panel-ceiling-bracket.scad
+++ b/led-panel-ceiling-bracket.scad
@@ -8,18 +8,27 @@ backspc = 10;
 light_height = 12.5;
 hole_from_back = 7.2 + 0.5;
 hole_dia = 3.5 + 0.5;
+bolthead_dia = 7 + 1.0;
+bolthead_depth = 5;
 
 height = light_height + backspc;
 
+octagon_fudge = 1/cos(22.5);
+
 module Bracket(){
   difference(){
     translate([-len/2, 0,0])
       cube([len, width, height]);
     for (xsgn=[-1,+1]) {
       translate([xsgn * holespc/2, -1, light_height - hole_from_back]) {
-	rotate([-90,0,0])
-	  rotate([0,0,360/8/2])
-	  cylinder(r=hole_dia/2, h=50, $fn=8);
+	rotate([-90,0,0]) {
+	  rotate([0,0,360/8/2]) {
+	    cylinder(r=bolthead_dia/2 * octagon_fudge,
+		     h= bolthead_depth +1, $fn=8);
+	    cylinder(r=hole_dia/2 * octagon_fudge,
+		     h=50, $fn=8);
+	  }
+	}
       }
     }
   }
-- 
2.30.2