Hi Guys,
I have a 4 axis machine and been using it with for a few years now. I have a noticed problem that has got me tossed. My centre of rotation is along the Y axis. After setting my zero points (x, y, z, a) and confirming that there is no misalignment between the  indexer and the tail-stock, when I initiate the run sequence, the piece is machined off centre by about 1mm. I am using Rhinocam and Mach3 though a Gecko controller. After a couple of days of checking all settings in both programs, there is nothing that looks out of place. I have never noticed this error before, so whether it is a new development or not I don't know. Problem is, if I machine the top surface, then rotate 180 degrees, the misalignment then totals 2mm. I am not too sure but could tool compensation be causing this issue?

I have posted an image that I found on another forum where a fellow was having the same issue when trying to machine a square end on a table leg. Unfortunately there was no final result/solution posted so I do not know the final outcome and there is no way to contact the person concerned.

So if anyone has experienced this, or knows of this issue and has an answer I would be most appreciative.

Thank you all in advance.

Phil

What happens if you where to index and machine 4 sides ?  Will it be a total of 4mm off (from first side to last).

How is your program set up, are the corridents a sub program and you just index and call the sub programs a second time ?

Can you post the program ?
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