challenge-bot.com Git - challenge-bot/blob - wheel.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 wheel_depth = 7.65;
   8 wheel_radius = 68/2;
   9
  10 module encoder_shaft(){
  11   motor_shaft_big = 3.7;
  12   motor_shaft_small = 4.8;
  13   motor_shaft_length = wheel_depth / 2;
  14
  15   intersection(){
  16     cylinder(h = motor_shaft_length,
  17              r = motor_shaft_big,
  18              center = true,
  19              $fn=100);
  20     cube([motor_shaft_big * 2.1, motor_shaft_small, motor_shaft_length],
  21          center = true);}}
  22
  23 module mounting_screw(){
  24   cylinder(h = wheel_depth * 1.1, r = 1, $fn = 100, center = true);}
  25
  26 module wheel(){
  27   translate([0, 0, wheel_depth / 2]){
  28     difference(){
  29       cylinder(h = wheel_depth, r = wheel_radius, center = true, $fn=100);
  30       translate([0, 0, wheel_depth/4]){
  31         scale([1, 1, 1.1]){
  32           encoder_shaft();}}
  33       mounting_screw();
  34       for(i = [0 : 4]){
  35         rotate(i * 360/5, [0, 0, 1]){
  36           translate([0, 0, -0.6 * wheel_depth])
  37             between_spokes();}}}}}
  38
  39 module wheel_block(){
  40   cube([wheel_radius, wheel_radius, wheel_depth]);}
  41
  42 module pie_slice(){
  43   intersection(){
  44     translate([0, 0, wheel_depth / 2]){
  45       cylinder(h = wheel_depth,
  46                r = 0.7 * wheel_radius,
  47                center = true);}
  48     translate([0, wheel_radius * 0.3, 0]){
  49       rotate([0, 0, (360/5)/2]){
  50         intersection(){
  51           wheel_block();
  52           rotate([0, 0, 90 - 360/5])
  53             wheel_block();}}}}}
  54
  55 module between_spokes(){
  56   minkowski(){
  57     pie_slice();
  58     cylinder(h = wheel_depth, r = 1, $fn=100);}}
  59
  60 wheel();