pulleymod.scad

// Belt pulley is http://www.thingiverse.com/thing:3104 by GilesBathgate
// GPLV3

include <configuration.scad>

module pulley()
{


	module spur()
	{
	linear_extrude(height=20) polygon([[-1,-1],[-1,1],[0.9,0.8],[0.9,-0.8]],[[0,1,2,3,0]]);
	}
	
 difference()
 {	 
 	union()
 	{
 		//base
 		rotate_extrude($fn=30)
 		{
 				square([9,8]);
 				square([10,7]);
 				translate([9,7]) circle(1);
 		}
    	
    	//shaft
    	cylinder(r=motor_shaft,h=20);
    	
    	//spurs
    	for(i=[1:8]) rotate([0,0,i*(360/8)]){
    	translate([6,0,0])spur();
	translate([6.5,0,0])spur();
	}
   }
   
   //shaft hole
    translate([0,0,-1])cylinder(r=motor_shaft/2+0.4,h=22,$fn=15);
    		
    //captive nut and grub holes
    for(j=[1:1]) rotate([0,0,j*(360/3)])
	translate([0,20,4])rotate([90,0,0])
	union()
	{
		//entrance
		translate([0,-3,15]) cube([8.6,7,3],center=true);
		//nut
		translate([0,0,13.6]) rotate([0,0,30])cylinder(r=4.22,h=2.8,$fn=6);
		//grub hole
		translate([0,0,9]) cylinder(r=1.9,h=10);
	}

 }

   
}

pulley();