// challenge-bot
// GNU AGPLv3 (or later at your option)
// project available at these locations:
// https://gitorious.org/ozzloy/challenge-bot
// https://github.com/waynegramlich/challenge-bot

module encoder_shaft(){
  motor_shaft_big = 3.7;
  motor_shaft_small = 4.8;
  motor_shaft_length = 7.65 / 2;

  intersection(){
    cylinder(h = motor_shaft_length,
             r = motor_shaft_big,
             center = true,
             $fn=100);
    cube([motor_shaft_big * 2.1, motor_shaft_small, motor_shaft_length],
         center = true);}}

module wheel(){
  depth = 7.65;
  radius = 68/2;
  difference(){
    cylinder(h = depth, r = radius, center = true, $fn=100);
    translate([0, 0, 7.65/4])
      scale([1, 1, 1.1])
        encoder_shaft();
    cylinder(h = depth * 1.1, r = 1, $fn = 100, center = true);}}

translate([0, 0, 7.65/2]) wheel();