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« Last post by Muzzerboy on March 26, 2024, 01:21:24 PM »
Can you not adjust out (or at least reduce) that backlash? Many / most rotary tables have an eccentric adjuster on the wormwheel for this purpose.
Backlash adjustment in software assumes the table is driven against a friction-like drag load that resists angular movement but you may well have a machining load that biases the wormwheel in the other direction, in which case the anti-backlash may actually double the error when you change the direction of movement.
To measure the angular error, perhaps you would want to lock the table and then apply a controlled torque to the wormwheel in each direction. It's not a perfect science, since there is inevitably a degree of spring so that the backlash will depend on the torque you apply. If you applied no torque but simply moved the wormwheel in alternate directions, you'd get a smaller backlash - but not necessarily what you will see with a real world load applied.....