Playing with parametric gears in CoffeeScad

ParaGears.coffee

class Tooth
  constructor: ()->
  
    @csg = new Cylinder
      r: 1
      h: 1
      center: true
      
    @csg = @csg.scale [1,2.5,1]

    
class Gear
  constructor: (@numTeeth) ->

    @pitchAngle = 360 / @numTeeth
    teeth=[]
    @dia = 4 * @numTeeth / 3.1415
    
    for angle in [0..359] by @pitchAngle
      t = new Tooth
      teeth.push(t.csg.translate([0,@dia/2-1.5,0]).rotate([0,0,-angle]))
      
    c1 = new Cylinder
      d: @dia-3
      h: 1
      center: true
      
    c2 = new Cylinder
      d: @dia+1.75
      h: 1
      center: true
    
    @csg = c1.union(teeth)
    @csg = @csg.intersect(c2)
        
g1 = new Gear 10
g1.csg = g1.csg.rotate([0,0,g1.pitchAngle/2])
g1.csg = g1.csg.translate([-g1.dia/2,0,0])

g2 = new Gear 30
g2.csg = g2.csg.translate([g2.dia/2,0,0])

return g1.csg.union(g2.csg)