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 standoff_height = 55; // eyeballed
   8 nut_short_side = 4.7; // from calipers
   9 nut_height = 1.6; // from calipers
  10 standoff_radius = 14.732 / 2; // 0.580 / 2 inches from spec sheet
  11 screw_radius = 2.286/2;  // 0.090 inches
  12 caster_flange_screw_length = 8; // eyeballed
  13 // eyeballed caster flange height, (0.580/5) inches, times 2 to be stronger
  14 caster_flange_height = 2.9464 * 2;
  15 caster_flange_width = 20.32;  // 0.800 inches
  16 ziptie_width = 4.7625; // 3/16 inch
  17 ziptie_height = 3; // i'm guessing
  18
  19 module caster_flange_screws(){
  20   translate([standoff_radius, 0, 0])
  21     cylinder(h = caster_flange_screw_length, r = screw_radius, $fn = 20);
  22   translate([-standoff_radius, 0, 0])
  23     cylinder(h = caster_flange_screw_length, r = screw_radius, $fn = 20);}
  24
  25 module caster_flange(){
  26   side_radius = caster_flange_width / 2 - standoff_radius;
  27   hull(){
  28     cylinder(h = caster_flange_height, r = standoff_radius);
  29     translate([standoff_radius, 0, 0])
  30       cylinder(h = caster_flange_height, r = side_radius);
  31     translate([-standoff_radius, 0, 0])
  32       cylinder(h = caster_flange_height, r = side_radius);}}
  33
  34 module nut(size, height){
  35     width = size/1.75;
  36     for (r = [-60, 0, 60]) rotate([0,0,r]) cube([width, size, height], true);}
  37
  38 module nuts(){
  39   translate([standoff_radius, 0, nut_height/2])
  40     nut(nut_short_side, nut_height);
  41   translate([-standoff_radius, 0, nut_height/2])
  42     nut(nut_short_side, nut_height);}
  43
  44 module caster_standoff(){
  45   difference(){
  46     union(){
  47       cylinder(h = standoff_height, r = standoff_radius);
  48       translate([0, 0, standoff_height - caster_flange_height])
  49         caster_flange();}
  50     translate([0, 0, standoff_height - caster_flange_screw_length * 1.1 + 0.1])
  51       scale([1, 1, 1.1])
  52         caster_flange_screws();
  53     translate([0, 0, standoff_height - (caster_flange_height + nut_height)])
  54       nuts();}}
  55
  56 caster_standoff();