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 tower_width = 18;
  15 tower_slot_width = 3;
  16
  17 // tuning
  18
  19 tower_over_angle = 45;
  20 tower_wall_thick = 1.6;
  21 tower_base_height = 10;
  22 tower_forehead_angle = 30;
  23
  24 //--- tests ---
  25
  26 test_width = 24;
  27 test_height = 24;
  28
  29 test_thicks = [9,14,21];
  30
  31 module Tests(){ ////toplevel
  32   for (thicki=[0:len(test_thicks)-1]) {
  33     translate([thicki*test_width-0.5, 0, 0]) {
  34       difference(){
  35         cube([test_width,
  36               test_thicks[thicki] + led_depth,
  37               test_height]);
  38         translate([test_width/2, -1, test_height/2])
  39           rotate([-90,0,0])
  40           cylinder(r=led_dia/2, h=led_depth+1, $fn=30);
  41       }
  42     }
  43   }
  44 }
  45
  46 //Tests();
  47
  48 //--- real thing ---
  49
  50 tower_overhang = led_dia * 2.5;
  51
  52 tower_over_max_y = tower_overhang * sin(tower_over_angle);
  53 tower_over_max_z = tower_frontheight + tower_overhang * cos(tower_over_angle);
  54 tower_total_max_z = tower_over_max_z + vert_space_inside + led_depth;
  55 tower_rearwall_y = -(backfront_space_inside + tower_wall_thick);
  56
  57 backfront_mate_extra = (backfront_mate_size - (-tower_rearwall_y));
  58
  59 module TowerWallCrossSection(){
  60   // generates a 2D shape - a polygon
  61   // x is what is going to be -y
  62   // y is what is going to be z
  63   polygon([[0,                  0],
  64            [0,                  tower_frontheight],
  65            [-tower_over_max_y,  tower_over_max_z],
  66            [-tower_over_max_y
  67             + tan(tower_forehead_angle) * (vert_space_inside + led_depth),
  68             tower_total_max_z],
  69            [-tower_rearwall_y,  tower_total_max_z],
  70            [-tower_rearwall_y,  0],
  71            [-tower_rearwall_y, -tower_base_height],
  72            [-backfront_mate_extra, -tower_base_height]]);
  73 }
  74
  75 module TowerWallSomeEdge(front){
  76   minkowski(){
  77     difference(){
  78       TowerWallCrossSection();
  79       translate([front ? 0.10 : -0.10, 0])
  80         TowerWallCrossSection();
  81     }
  82     circle(r=tower_wall_thick, $fn=8);
  83   }
  84 }
  85
  86 module TowerBulkCrossSection(){
  87   intersection(){
  88     TowerWallCrossSection();
  89     union(){
  90       translate([-tower_over_max_y/2,
  91                  tower_frontheight + tower_overhang*sin(tower_over_angle)/2])
  92         circle(r = led_depth);
  93       TowerWallSomeEdge(true);
  94       translate([-50, -50])
  95         square([100, 50]);
  96     }
  97   }
  98 }
  99
 100 module TowerRearWallCrossSection(){
 101   intersection(){
 102     TowerWallCrossSection();
 103     union(){
 104       intersection(){
 105         translate([0,-10]) square([100, 10+tower_frontheight]);
 106         TowerWallSomeEdge(false);
 107       }
 108       TowerBulkCrossSection();
 109     }
 110   }
 111 }
 112
 113
 114 module TowerCrossSectionDemo(){
 115   %TowerWallCrossSection();
 116   //TowerBulkCrossSection();
 117   TowerRearWallCrossSection();
 118 }
 119
 120 module TowerMain(){
 121   for (mir=[0,1])
 122     mirror([mir,0,0]) rotate([90,0,-90]) {
 123       translate([0,0, tower_width/2-tower_wall_thick])
 124         linear_extrude(height=tower_wall_thick)
 125         TowerWallCrossSection();
 126       translate([0,0,-1])
 127         linear_extrude(height=tower_width/2+0.9)
 128         TowerBulkCrossSection();
 129       translate([0,0, tower_slot_width/2])
 130         linear_extrude(height=(tower_width - tower_slot_width)/2 - 0.2)
 131         TowerRearWallCrossSection();
 132     }
 133 }
 134
 135 module Tower(){
 136   difference(){
 137     TowerMain();
 138   }
 139 }
 140
 141 //TowerCrossSectionDemo();
 142 //TowerWallSomeEdge(false);
 143 //TowerWallFrontEdge();
 144 Tower();