brompton-computer-guard.scad

   1 // -*- C -*-
   2
   3 cover_ysz = 45;
   4 cover_len = 70;
   5
   6 attach_tube_dia = 18;
   7
   8 attach_cx = -15;
   9 attach_cdy = -5;
  10 attach_w = 25;
  11
  12 attach_inrad = 25; ///
  13 attach_hole_dist = 5; ///
  14 attach_hole_dia = 4 + 0.5; ///
  15 attach_ang = 45;
  16
  17 // calculated
  18
  19 cover_lcircle_r = cover_ysz / (1 + 1/sqrt(2));
  20
  21 base_len = cover_len - cover_lcircle_r;
  22
  23 attach_straight_len =
  24   attach_inrad + attach_tube_dia + attach_hole_dist + attach_hole_dia/2
  25   - attach_w / 2 + attach_hole_dist;
  26
  27 module RearSideTemplate(){
  28   polygon([[0.1,0],
  29            [-base_len,0],
  30            [-base_len,-cover_ysz],
  31            [0.1,      -cover_ysz]]);
  32   translate([-base_len, -cover_ysz + cover_lcircle_r])
  33     circle(r=cover_lcircle_r);
  34 }
  35
  36 module AttachTemplate(){
  37   hull(){
  38     polygon([[0,   0],
  39              [-0.1, 0],
  40              [-0.1, -cover_ysz],
  41              [0,    -cover_ysz]]);
  42     translate([attach_cx, -attach_cdy]) rotate([0,0,-attach_ang]) {
  43       polygon([[-attach_cx,          attach_w/2],
  44                [0,                   -attach_w/2],
  45                [attach_straight_len, -attach_w/2],
  46                [attach_straight_len, attach_w/2]]);
  47       translate([attach_straight_len, 0])
  48         circle(r=attach_w/2);
  49     }
  50   }
  51 }
  52
  53 module Tube(){
  54   %translate([attach_cx, -attach_cdy, -20]) {
  55     rotate_extrude(convexity=10) {
  56       translate([attach_inrad + attach_tube_dia/2, 0])
  57         circle(r=attach_tube_dia/2);
  58     }
  59   }
  60 }
  61
  62 module Bolt(){
  63   %translate([0,0,-50]) linear_extrude(height=80) {
  64     circle(r=attach_hole_dia/2, $fn=20);
  65   }
  66   %translate([0,0,10]) linear_extrude(height=20) {
  67     circle(r=attach_hole_dia/2 * 2, $fn=20);
  68   }
  69 }
  70
  71 module Bolts(){
  72   translate([attach_cx, -attach_cdy]) rotate([0,0,-attach_ang]) {
  73     translate([attach_inrad - attach_hole_dist - attach_hole_dia/2, 0])
  74       Bolt();
  75     translate([attach_inrad + attach_tube_dia
  76                +attach_hole_dist + attach_hole_dia/2, 0])
  77       Bolt();
  78   }
  79 }
  80
  81 color("blue") RearSideTemplate();
  82 AttachTemplate();
  83 Tube();
  84 Bolts();