Feedback is the key to the accuracy of ANY type of CNC system.
The glass scales SHOULD be telling your controller where the "table is" on your current system.
The encoder based servos used on the Ajax system tell the controller where the servo went - due to slop in table ways/gibbs, ball screws, motor drive, etc - your Ajax system won't be getting TRUE table position feedback.
If you dutifully go to the trouble to tune out ANY/ALL slop, you should end up with reasonable accuracy with your new system.
However, your "new" controller still won't/can't actually "know" where the table went because of it NOT having first hand knowledge of the TRUE table position with the new system. |