led-panel-ceiling-bracket.scad

   1 // -*- C -*-
   2
   3 holespc = 20;
   4
   5 len = 50;
   6 width = 20;
   7 backspc = 8;
   8 extra_height = 2;
   9 light_height = 12.5;
  10 hole_from_back = 7.2 + 0.5;
  11 hole_dia = 3.5 + 0.5;
  12 bolthead_dia = 7 + 1.0;
  13 bolthead_depth = 5 + 20 - 12 + 2.7/2;
  14
  15 plasfix_dia = 4.5 + 0.5 + 1.1;
  16 plasfix_head = plasfix_dia * 2;
  17 plasfix_headdep = plasfix_dia;
  18 plasfix_sink = 3;
  19
  20 height = light_height + backspc + extra_height;
  21
  22 octagon_fudge = 1/cos(22.5);
  23
  24 module Bracket(){
  25   difference(){
  26     translate([-len/2, 0, 0])
  27       cube([len, width, height]);
  28     for (xsgn=[-1,+1]) {
  29       translate([xsgn * holespc/2, -1,
  30                  light_height - hole_from_back + extra_height]) {
  31         rotate([-90,0,0]) {
  32           rotate([0,0,360/8/2]) {
  33             cylinder(r=bolthead_dia/2 * octagon_fudge,
  34                      h= bolthead_depth +1, $fn=8);
  35             cylinder(r=hole_dia/2 * octagon_fudge,
  36                      h=50, $fn=8);
  37           }
  38         }
  39       }
  40     }
  41     translate([0, width/2, 0]) {
  42       cylinder(r= plasfix_dia/2, h=50, $fn=20);
  43       hull(){
  44         cylinder(r= plasfix_dia/2, h= plasfix_headdep + plasfix_sink, $fn=20);
  45         translate([0,0,-1])
  46           cylinder(r= plasfix_head/2, h= plasfix_sink + 1, $fn=20);
  47       }
  48     }
  49   }
  50 }
  51
  52 Bracket();