led-panel-ceiling-bracket.scad

   1 // -*- C -*-
   2
   3 holespc = 20;
   4
   5 len = 50;
   6 width = 20;
   7 backspc = 10;
   8 light_height = 12.5;
   9 hole_from_back = 7.2 + 0.5;
  10 hole_dia = 3.5 + 0.5;
  11 bolthead_dia = 7 + 1.0;
  12 bolthead_depth = 5;
  13
  14 height = light_height + backspc;
  15
  16 octagon_fudge = 1/cos(22.5);
  17
  18 module Bracket(){
  19   difference(){
  20     translate([-len/2, 0,0])
  21       cube([len, width, height]);
  22     for (xsgn=[-1,+1]) {
  23       translate([xsgn * holespc/2, -1, light_height - hole_from_back]) {
  24         rotate([-90,0,0]) {
  25           rotate([0,0,360/8/2]) {
  26             cylinder(r=bolthead_dia/2 * octagon_fudge,
  27                      h= bolthead_depth +1, $fn=8);
  28             cylinder(r=hole_dia/2 * octagon_fudge,
  29                      h=50, $fn=8);
  30           }
  31         }
  32       }
  33     }
  34   }
  35 }
  36
  37 Bracket();