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 = 8.7 + 0.5 + 1.1;
  17 plasfix_headdep = plasfix_dia;
  18 plasfix_sink = 8;
  19
  20 height = light_height + backspc + extra_height;
  21
  22 octagon_fudge = 1/cos(22.5);
  23
  24 echo("remain", width - bolthead_depth);
  25
  26 module Bracket(){
  27   difference(){
  28     translate([-len/2, 0, 0])
  29       cube([len, width, height]);
  30     for (xsgn=[-1,+1]) {
  31       translate([xsgn * holespc/2, -1,
  32                  light_height - hole_from_back + extra_height]) {
  33         rotate([-90,0,0]) {
  34           rotate([0,0,360/8/2]) {
  35             cylinder(r=bolthead_dia/2 * octagon_fudge,
  36                      h= bolthead_depth +1, $fn=8);
  37             cylinder(r=hole_dia/2 * octagon_fudge,
  38                      h=50, $fn=8);
  39           }
  40         }
  41       }
  42     }
  43     translate([0, width/2, 0]) {
  44       cylinder(r= plasfix_dia/2, h=50, $fn=20);
  45       translate([0,0,-1])
  46         cylinder(r= plasfix_head/2, h= plasfix_sink + 1, $fn=20);
  47     }
  48   }
  49 }
  50
  51 module BracketPrint(){
  52   rotate([0,180,0])
  53     Bracket();
  54 }
  55
  56 BracketPrint();