Quote Originally Posted by JAZZCNC View Post
Now the diameter for HTD 5mm pitch 20T pulley is approx 30mm so the amount traveld (pitch) for 1 revolution is 30*pi so 30*3.141=94mm.!!!
It doesn't change the point you're making, but that's a rather roundabout way to get the circumference! To find the distance traveled per revolution just multiply the pitch by the number of teeth - i.e. 5*20=100mm. Save the pi for other occasions.