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 standoff_radius = 14.732 / 2; // 0.580 / 2 inches from spec sheet
  11 standoff_height = 48; // eyeballed
  12
  13 // eyeballed caster flange height, (0.580/5) inches, times 2 to be stronger
  14 caster_flange_height = 5;
  15 caster_flange_width = 20.32;  // 0.800 inches
  16 caster_flange_screw_radius = 2.286 / 2;  // 0.090 inches
  17 caster_flange_screw_length = 8; // eyeballed
  18
  19 deck_grid_width = 25.4; // measured center to center on grid on pegboard
  20 deck_flange_height = 2.9464;
  21 deck_flange_screw_radius = 3.556 / 2;  // For #6 machine screws
  22 deck_flange_radius = (deck_grid_width) / 2 + deck_flange_screw_radius + 3;
  23
  24 module deck_flange(){
  25   difference(){
  26     cylinder(h = deck_flange_height, r = deck_flange_radius);
  27     for(ii = [-1, 1]){
  28       translate([deck_grid_width / 2 * ii, 0, -.1])
  29         cylinder(h = deck_flange_height * 1.1,
  30                  r = deck_flange_screw_radius);
  31       translate([0, deck_grid_width / 2 * ii, -.1])
  32         cylinder(h = deck_flange_height * 1.1,
  33         r = deck_flange_screw_radius);}}}
  34
  35 module deck_flange_reinforcement(){
  36   translate([-deck_flange_radius,
  37              -.5 * deck_flange_height / 2,
  38              deck_flange_height]){
  39     difference (){
  40       cube([deck_flange_radius, deck_flange_height / 2, deck_flange_radius]);
  41       translate([-.1, -.05 * deck_flange_height, 0]){
  42         rotate([0, -45, 0]){
  43           cube([deck_flange_radius * 1.5, // 1.5 is bigger than sqrt(2)
  44                 deck_flange_height * 1.1, // 1.1 is bigger than 1
  45                 deck_flange_radius]);}}}}}
  46
  47 module caster_standoff(){
  48   cylinder(h = standoff_height - caster_flange_height,
  49            r = standoff_radius);
  50   deck_flange();
  51   for(ii = [0:3]){
  52     rotate([0, 0, 45 + 90 * ii])
  53       deck_flange_reinforcement();}
  54   caster_deck_interlock_solid();}
  55
  56 module ball_holder(){
  57   /* measured with calipers */
  58   ball_diameter = 12.7 + 0.5;
  59   ball_radius = ball_diameter / 2;
  60
  61   wall_thickness = 1.5;
  62   holder_height = ball_radius + wall_thickness * 2;
  63
  64   holder_outer_radius = ball_radius + wall_thickness;
  65   holder_outer_diameter = holder_outer_radius * 2;
  66
  67   difference (){
  68     cylinder(r = holder_outer_radius, h = holder_height);
  69     translate([0, 0, ball_radius + wall_thickness]){
  70       sphere(r = ball_radius);}
  71     translate([0, 0, holder_height / 2 + wall_thickness]){
  72       cube([holder_outer_diameter + 0.1,
  73             wall_thickness * 2,
  74             holder_height],
  75            center = true);}}}
  76
  77 ball_holder();
  78 //caster_standoff();