Originally Posted by Larken  It would be easiest to remove the tach and mount the encoder on the motor.
But your machine would be more accurate though with it mounted on the screw, as long as the belt has no backlash in at, just harder to tune. But by increasing the D (derivative) you can overcome most backlash problems.
How many turns/inch is the main screw ? |
Hi Larry, thanks for the reply.
The existing resolver mount on the end of the screw is going to make it a sinch to mount the new encoder, I won't even need to disturb the motors.
Photo of the
z axis resolver
The screw is a 5mm pitch. photo of the
Z axis screw
There is very little backlash, more a stretching of the belt to overcome the stiction in the slides. Photo of the
drive belt setup
So it looks like my preference wil be to mount the new encoder in the end of the ball screw.
ATB
Derek