crossbar-computer-led-mount.scad

   1 // -*- C -*-
   2
   3 led_dia = 5 + 0.6;
   4 led_depth = 5;
   5
   6 led_tip_z = 70;
   7 led_angle = -60;
   8
   9 vert_space_inside = 8;
  10 backfront_space_inside = 12;
  11
  12 backfront_mate_size = 25;
  13 tower_frontheight = 20;
  14
  15 // tuning
  16
  17 tower_over_angle = 45;
  18 tower_wall_thick = 1.6;
  19 tower_base_height = 10;
  20 tower_forehead_angle = 30;
  21
  22 //--- tests ---
  23
  24 test_width = 24;
  25 test_height = 24;
  26
  27 test_thicks = [9,14,21];
  28
  29 module Tests(){ ////toplevel
  30   for (thicki=[0:len(test_thicks)-1]) {
  31     translate([thicki*test_width-0.5, 0, 0]) {
  32       difference(){
  33         cube([test_width,
  34               test_thicks[thicki] + led_depth,
  35               test_height]);
  36         translate([test_width/2, -1, test_height/2])
  37           rotate([-90,0,0])
  38           cylinder(r=led_dia/2, h=led_depth+1, $fn=30);
  39       }
  40     }
  41   }
  42 }
  43
  44 //Tests();
  45
  46 //--- real thing ---
  47
  48 tower_overhang = led_dia * 2.5;
  49
  50 tower_over_max_y = tower_overhang * sin(tower_over_angle);
  51 tower_over_max_z = tower_frontheight + tower_overhang * cos(tower_over_angle);
  52 tower_total_max_z = tower_over_max_z + vert_space_inside + led_depth;
  53 tower_rearwall_y = -(backfront_space_inside + tower_wall_thick);
  54
  55 backfront_mate_extra = (backfront_mate_size - (-tower_rearwall_y));
  56
  57 module TowerWallCrossSection(){
  58   // generates a 2D shape - a polygon
  59   // x is what is going to be -y
  60   // y is what is going to be z
  61   polygon([[0,                  0],
  62            [0,                  tower_frontheight],
  63            [-tower_over_max_y,  tower_over_max_z],
  64            [-tower_over_max_y
  65             + tan(tower_forehead_angle) * (vert_space_inside + led_depth),
  66             tower_total_max_z],
  67            [-tower_rearwall_y,  tower_total_max_z],
  68            [-tower_rearwall_y,  0],
  69            [-tower_rearwall_y, -tower_base_height],
  70            [-backfront_mate_extra, -tower_base_height]]);
  71 }
  72
  73 module TowerBulkCrossSection(){
  74   intersection(){
  75     TowerWallCrossSection();
  76     union(){
  77       translate([-tower_over_max_y/2,
  78                  tower_frontheight + tower_overhang*sin(tower_over_angle)/2])
  79         circle(r = led_depth);
  80     }
  81   }
  82 }
  83
  84 %TowerWallCrossSection();
  85 TowerBulkCrossSection();