chimney-cable-retainer.scad

   1 // -*- C -*-
   2
   3 include <utils.scad>
   4
   5 inrear_d_real = 20;
   6 inrear_d = 15;
   7 bar_th = 5;
   8 general_th = 5;
   9 between_cables = 150;
  10 around_cables = 20;
  11 cable_dia = 15;
  12
  13 total_d = 40;
  14 above_h = 40;
  15
  16 // calculated
  17
  18 cable_x = around_cables + cable_dia/2;
  19 total_x = cable_x * 2 + between_cables;
  20
  21 below_h = above_h;
  22
  23 sit_angle = atan2(inrear_d_real - inrear_d, below_h);
  24
  25 module CoreElevation(){
  26   rotate(-sit_angle)
  27     rectfromto([ 0, 0 ],
  28                [ total_d, general_th ]);
  29   rectfromto([ 0, 0 ],
  30              [ general_th, above_h ]);
  31   translate([ inrear_d, -above_h ])
  32     rectfromto([ 0,0 ],
  33                [ -bar_th, -bar_th ]);
  34 }
  35
  36 module Retainer(){ ////toplevel
  37   difference(){
  38     union(){
  39       linextr_x_yz(0, total_x)
  40         mirror([1,0])
  41         CoreElevation();
  42     }
  43
  44     for (x = [cable_x, total_x - cable_x])
  45       translate([x, 0, 0])
  46       linextr(-below_h/2, 100)
  47       hull(){
  48         translate([ 0, -(general_th + cable_dia/2) ])
  49           circle(r = cable_dia/2);
  50         translate([ 0, -(total_d + 1)])
  51           square([ cable_dia, 1], center=true);
  52       }
  53   }
  54 }