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Author Topic: Circle Not a circle when cut  (Read 943 times)

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Circle Not a circle when cut
« on: April 08, 2015, 10:21:03 AM »
Hi all,
   I have recently installed my machmotion controller to my old router table powered by Delta ASDA-A2 servo drives. Y and A moves the gantry forward and backwards and have 1:10 reduction gear boxes with 1Kw Servo motor, the X axis has a 1:7 reduction gear box with a 1.5 kw servo motor. All drives of those servos are set to pulse direction and have been set to 1000 Numerator and 10 denominator electronic gear ratio.
 
   When i cut a circle the dimensions along X and Y are perfect but the shape is oval skewed 1.5mm more than the correct size ? i tried increasing the acceleration on the motors and tuning, that helped a little but did not solve the problem. What could it be? could the different gearbox ratios be the problem?

Thanks

Offline Hood

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Re: Circle Not a circle when cut
« Reply #1 on: April 08, 2015, 06:16:40 PM »
Sounds like you may be suffering from backlash, could well be in the reduction boxes unless they are very high quality zero backlash ones.
Hood