Yes there is a plugging already available for mach 4.
This is the link the encoder module.
http://www.zappautomation.co.uk/elec...io-ip-s-a.html
however, you would typically fit a servo to the spindle to get the best from it for tapping.
If the existing spindle is a high speed spindle, it is unlikely you will be able to tap with it, due to the lack of torque at the lower speeds.

Quote Originally Posted by Chaz View Post
Thanks, yes, sorry, that's what I meant. I ordered the controller about an hour ago to get it for the weekend on the basis that I was fairly certain it was correct.

Does this controller work with Mach 4?

Which of the modules is the encoder module? Are you able to link it please? Also, how would I know, what do I look for that might be able to indicate if its needed or not?