brompton-computer-guard.scad

   1 // -*- C -*-
   2
   3 cover_ysz = 45;
   4 cover_len = 70;
   5
   6 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 attach_dz = 2;
  18
  19 comp_dx = 22;
  20 comp_xsz = 45;
  21 comp_zsz = 28;
  22
  23 comp_dy = 5;
  24
  25 leftend_zsz = 10;
  26 leftend_dz = comp_zsz * 0.6;
  27
  28 min_thick = 4;
  29
  30 rightend_thick = 10;
  31 bolthead_space = 4;
  32
  33 // calculated
  34
  35 cover_lcircle_r = cover_ysz / (1 + 1/sqrt(2));
  36
  37 base_len = cover_len - cover_lcircle_r;
  38
  39 attach_end_r = attach_w/2;
  40
  41 attach_straight_len =
  42   attach_inrad + tube_dia + attach_hole_dist + attach_hole_dia/2
  43   - attach_end_r + attach_hole_dist;
  44
  45 attach_down = tube_dia/2 + attach_dz;
  46
  47 attach_xmax = attach_cx +
  48   cos(attach_ang) * attach_straight_len + attach_end_r;
  49
  50 module RearSideTemplate(){
  51   polygon([[0.1,0],
  52            [-base_len,0],
  53            [-base_len,-cover_ysz],
  54            [0.1,      -cover_ysz]]);
  55   translate([-base_len, -cover_ysz + cover_lcircle_r])
  56     circle(r=cover_lcircle_r);
  57 }
  58
  59 module AttachTemplate(){
  60   hull(){
  61     polygon([[0,   0],
  62              [-0.1, 0],
  63              [-0.1, -cover_ysz],
  64              [0,    -cover_ysz]]);
  65     translate([attach_cx, -attach_cdy]) rotate([0,0,-attach_ang]) {
  66       polygon([[-attach_cx,          attach_w/2],
  67                [0,                   -attach_w/2],
  68                [attach_straight_len, -attach_w/2],
  69                [attach_straight_len, attach_w/2]]);
  70       translate([attach_straight_len, 0])
  71         circle(r=attach_end_r);
  72     }
  73   }
  74 }
  75
  76 module AttachElevation(anddown){
  77   hull(){
  78     translate([-cover_len - 0.5, leftend_dz - leftend_zsz/2])
  79       square([1, leftend_zsz]);
  80     translate([-comp_dx - comp_xsz/2, -0.1])
  81       square([comp_xsz, comp_zsz + min_thick]);
  82     translate([attach_xmax, 0])
  83       square([1, rightend_thick + bolthead_space]);
  84   }
  85   if (anddown)
  86     translate([-comp_dx, -attach_down-5])
  87       square([comp_dx + attach_xmax+2, attach_down+6]);
  88 }
  89
  90 module AttachElevationSelector(anddown) {
  91   translate([0,100,0]) rotate([90,0,0]) linear_extrude(height=200)
  92     AttachElevation(anddown);
  93 }
  94
  95 module BodyPositive(){
  96   intersection(){
  97     linear_extrude(height=60) RearSideTemplate();
  98     AttachElevationSelector(false);
  99   }
 100   intersection(){
 101     translate([0,0,-attach_down]) linear_extrude(height=100) AttachTemplate();
 102     AttachElevationSelector(true);
 103   }
 104 }
 105
 106 module Cutouts(){
 107   Tube();
 108   Bolts();
 109   Computer();
 110 }
 111
 112 module Body(){
 113   difference(){
 114     intersection(){
 115       BodyPositive();
 116       translate([-100,-200,-100]) cube([200,200,200]);
 117     }
 118     Cutouts();
 119   }
 120 }
 121
 122 module Computer(){
 123   translate([-comp_dx - comp_xsz/2, -cover_ysz + comp_dy, -50])
 124     cube([comp_xsz, 100, comp_zsz + 50]);
 125 }
 126
 127 module Tube(){
 128   translate([attach_cx, -attach_cdy, -tube_dia/2 - 0.1 - attach_dz]) {
 129     rotate_extrude(convexity=10) {
 130       translate([attach_inrad + tube_dia/2, 0])
 131         circle(r=tube_dia/2);
 132     }
 133   }
 134 }
 135
 136 module Bolt(){
 137   translate([0,0,-50]) linear_extrude(height=80) {
 138     circle(r=attach_hole_dia/2, $fn=20);
 139   }
 140   translate([0,0,rightend_thick]) linear_extrude(height=80) {
 141     circle(r=attach_hole_dia/2 * 2, $fn=20);
 142   }
 143 }
 144
 145 module Bolts(){
 146   translate([attach_cx, -attach_cdy]) rotate([0,0,-attach_ang]) {
 147     translate([attach_inrad - attach_hole_dist - attach_hole_dia/2, 0])
 148       Bolt();
 149     translate([attach_inrad + tube_dia
 150                +attach_hole_dist + attach_hole_dia/2, 0])
 151       Bolt();
 152   }
 153 }
 154
 155 module Demo(){
 156   Cutouts();
 157   %BodyPositive();
 158 }
 159
 160 //Demo();
 161 Body();