Quote Originally Posted by eltel View Post
Having trouble getting low cost tap for Left hand thread. ( X axis one=rh and one=lh so torque is balanced.) Shafts are 20mm for x and y, trapezodial 16mm.
Welcome eltel....

I am sure John S had a discussion with somebody about making taps out of the M16 left hand trapazoidal thread .

When he see's this he may be able to shed some light on it, just depends what mood he is in...:whistling: