challenge-bot.com Git - challenge-bot/blob - 3d-printables/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 // use 10 ish for development, 60 or so for printing
   8 $fn = 60;
   9
  10 /* measured with calipers */
  11 ball_diameter = 12.7 + 1.125;
  12 ball_radius = ball_diameter / 2;
  13
  14 wall_thickness = 1;
  15 holder_height = (25 / 32) * ball_diameter + wall_thickness;
  16
  17 holder_radius = ball_radius + wall_thickness;
  18 holder_diameter = holder_radius * 2;
  19
  20 standoff_radius = holder_radius; // 0.580 / 2 inches from spec sheet
  21 standoff_height = 48; // eyeballed
  22
  23 // eyeballed caster flange height, (0.580/5) inches, times 2 to be stronger
  24 caster_flange_height = 5;
  25 caster_flange_width = 20.32;  // 0.800 inches
  26 caster_flange_screw_radius = 2.286 / 2;  // 0.090 inches
  27 caster_flange_screw_length = 8; // eyeballed
  28
  29 deck_grid_width = 25.4; // measured center to center on grid on pegboard
  30 deck_flange_height = 2.9464;
  31 deck_flange_screw_radius = 3.556 / 2;  // For #6 machine screws
  32 deck_flange_radius = (deck_grid_width) / 2 + deck_flange_screw_radius + 3;
  33
  34 module deck_flange(){
  35   difference(){
  36     cylinder(h = deck_flange_height, r = deck_flange_radius);
  37     for(ii = [-1, 1]){
  38       translate([deck_grid_width / 2 * ii, 0, -.1])
  39         cylinder(h = deck_flange_height * 1.1,
  40                  r = deck_flange_screw_radius);
  41       translate([0, deck_grid_width / 2 * ii, -.1])
  42         cylinder(h = deck_flange_height * 1.1,
  43         r = deck_flange_screw_radius);}}}
  44
  45 module deck_flange_reinforcement(){
  46   translate([-deck_flange_radius,
  47              -.5 * deck_flange_height / 2,
  48              deck_flange_height]){
  49     difference (){
  50       cube([deck_flange_radius, deck_flange_height / 2, deck_flange_radius]);
  51       translate([-.1, -.05 * deck_flange_height, 0]){
  52         rotate([0, -45, 0]){
  53           cube([deck_flange_radius * 1.5, // 1.5 is bigger than sqrt(2)
  54                 deck_flange_height * 1.1, // 1.1 is bigger than 1
  55                 deck_flange_radius]);}}}}}
  56
  57 module ball_holder(){
  58   gap = wall_thickness * 4;
  59   difference (){
  60     cylinder(r = holder_radius, h = holder_height);
  61     translate([0, 0, ball_radius + wall_thickness]){
  62       sphere(r = ball_radius);}
  63     translate([0, 0, holder_height / 2 + wall_thickness]){
  64       cube([holder_diameter + 0.1, gap, holder_height],
  65            center = true);}}}
  66
  67 module caster_standoff(){
  68   cylinder(h = standoff_height,
  69            r = standoff_radius);
  70   deck_flange();
  71   for(ii = [0:3]){
  72     rotate([0, 0, 45 + 90 * ii])
  73       deck_flange_reinforcement();}
  74   translate([0, 0, standoff_height]){
  75     ball_holder();}}
  76
  77 //caster_standoff();
  78 ball_holder();