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 = 15;  // i made this up
  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 fixture(){
  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 nuts(){
  28   // i eyeballed this too, it's (0.580/5) inches, times 2 to be stronger
  29   height = 2.9464;
  30   width = 20.32;  // 0.800 inches
  31   between = 14.732;  //0.580 inches
  32   side_radius = (width - between)/2;
  33   translate([between/2, 0, 0]) cylinder(h = height, r = side_radius);
  34   translate([-between/2, 0, 0]) cylinder(h = height, r = side_radius);}
  35
  36 module ziptie(){
  37   ziptie_width = 4.7625; // 3/16 inch
  38   ziptie_height = 3; // i'm guessing
  39   standoff_radius = 14.732; // 0.580 inches
  40   translate([-standoff_radius/2, -ziptie_width/2, 0])
  41     cube([standoff_radius, ziptie_width, ziptie_height]);}
  42
  43 module caster_standoff(){
  44   height = 43;
  45   caster_radius = 14.732/2;
  46   fixture_height = 2.9464 * 2;
  47   difference(){
  48     union(){
  49       cylinder(h = height, r = caster_radius);
  50       fixture();}
  51     translate([0, 0, -.1]) scale([1, 1, 1.1]) ball_screws();
  52     translate([0, 0, fixture_height]) nuts();
  53     translate([0, 0, height * 3 / 4]) scale([1.1, 1, 1]) ziptie();
  54     rotate([0, 0, 90]) translate([0, 0, height * 1 / 2]) scale([1.1, 1, 1])
  55       ziptie();}}
  56
  57 caster_standoff();