challenge-bot.com Git - challenge-bot/blob - caster-standoff.scad

   1 // challenge-bot
   2 // GNU AGPLv3 (or later at your option)
   3 // project available at these locations:
   4 // https://gitorious.org/ozzloy/challenge-bot
   5 // https://github.com/waynegramlich/challenge-bot
   6
   7 $fn = 100;
   8
   9 module ball_screws(){
  10   between = 14.732;  // 0.580 inches
  11   screw_radius = 2.286/2;  // 0.090 inches
  12   screw_length = 8;  // i eyeballed this
  13   translate([between/2, 0, 0]) cylinder(h = screw_length, r = screw_radius);
  14   translate([-between/2, 0, 0]) cylinder(h = screw_length, r = screw_radius);}
  15
  16 module caster_flange(){
  17   // i eyeballed this too, it's (0.580/5) inches, times 2 to be stronger
  18   height = 2.9464 * 2;
  19   width = 20.32;  // 0.800 inches
  20   between = 14.732;  //0.580 inches
  21   side_radius = (width - between)/2;
  22   hull(){
  23     cylinder(h = height, r = between/2);
  24     translate([between/2, 0, 0]) cylinder(h = height, r = side_radius);
  25     translate([-between/2, 0, 0]) cylinder(h = height, r = side_radius);}}
  26
  27 module hexagon(size, height){
  28     boxWidth = size/1.75;
  29     for (r = [-60, 0, 60]) rotate([0,0,r]) cube([boxWidth, size, height], true);}
  30
  31 module nuts(){
  32   height = 1.6;  // from calipers
  33   overall_width = 20.32;  // 0.800 inches
  34   between = 14.732;  // 0.580 inches
  35   short_side_nut = 4.7;  // from calipers
  36   translate([between/2, 0, height/2]) hexagon(4.7, height);
  37   translate([-between/2, 0, height/2]) hexagon(4.7, height);}
  38
  39 module ziptie(){
  40   ziptie_width = 4.7625; // 3/16 inch
  41   ziptie_height = 3; // i'm guessing
  42   standoff_radius = 14.732; // 0.580 inches
  43   translate([-standoff_radius/2, -ziptie_width/2, 0])
  44     cube([standoff_radius, ziptie_width, ziptie_height]);}
  45
  46 module caster_standoff(){
  47   height = 43;
  48   caster_radius = 14.732/2;
  49   caster_flange_height = 2.9464 * 2;
  50   difference(){
  51     union(){
  52       cylinder(h = height, r = caster_radius);
  53       caster_flange();}
  54     translate([0, 0, -.1]) scale([1, 1, 1.1]) ball_screws();
  55     translate([0, 0, caster_flange_height]) nuts();
  56     translate([0, 0, height * 3 / 4]) scale([1.1, 1, 1]) ziptie();
  57     rotate([0, 0, 90]) translate([0, 0, height * 1 / 2]) scale([1.1, 1, 1])
  58       ziptie();}}
  59
  60 caster_standoff();