I just upgraded my PM30 to CNC. In running my first part it was out of calibration. I remember that Marty did a video on calibrating the axis. Anyone know which video this was?
I did the process while setting up my mill using the All in One DC but the process is the same.
Re: Axis calibration
Posted: Wed Jan 12, 2022 5:14 pm
by rk9268vc
the place to start is using your ball screw pitch to find out revs/inch. then use stepper/ servo's steps/rev to work it out.
To fine tune my PM-30 I used a sharp V bit/ engraver and marked out a line on a piece of 6061 as far apart as possible (like 20 in apart) and then measure it to work out your inaccuracies (you need to move the mill in only 1 dir to ignore backlash)
Once you got steps per in done, then use a dial indicator to work out your backlash to set your backlash comp
When milling a part to check accuracy, always conventional mill, not climb mill. This is the more rigid way since it isnt trying to pull your cutter into the mill making an undersize cut.