Had similar problems with mine. Sounds like you need a visit from somebody real familiar with EZTRAK servo and gib tuning.
Not a DIY project if you ask me as I watched and learned thru the whole process when mine was redone. Motor drives need to be tuned to the particular motor as they all respond a bit differently. If they are not tuned, they'll not cut round or straight or repeatably.
Lead error will accumulate the longer you travel. This adjustment was part of the tuning process by our service guy.
Brian at BPT Machine in Carol Steam IL did our 'TRAK (we're in Michigan) and it is deadly accurate now. |