Originally Posted by arvidb However if there's even a small amount of backlash present, use motor mounted encoders. Otherwise the motors will hunt back and forth, trying to "compensate" for the backlash and quickly wearing out themselves and the screws.
Arvid |
I have not had that experience, if the scale indictes it is in position the servo will null, the servo will only move if it 'sees' the table move. In other words if there is thrust against the table which is generally in one direction, the servo will compensate as it would if the encoder was on the motor, if the table is at rest with no thrust then the servo will not be active if there is no position error.
Al