include <MCAD/involute_gears.scad>

//<gregfrostoncouch> but I think you need to make the teeth taller and the roots shallower if
//<gregfrostoncouch> you want to suptract it and have it mesh properly

module gearsbyteethanddistance(t1=14,t2=51,t3=79, d=90)
{
	cp = 360*d/(t1+t2);
	translate([70.61+19.38,0,10]) gear(twist = 300/t1, number_of_teeth=t1, circular_pitch=cp);
	gear(twist = -300/t2, number_of_teeth=t2, circular_pitch=cp);
	difference()
	{
		cylinder(r=d+10+19.38, h=5);
		gear(twist = 300/t3, number_of_teeth = t3, circular_pitch = (360*(d+19.38)/t3));
	}
}

gearsbyteethanddistance();