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  1. 08-10-2015 #2
    komatias's Avatar
    Lives in Bristol, United Kingdom.
    komatias
    Last Activity: 06-07-2022 Has been a member for 9-10 years. Has a total post count of 559. Received thanks 61 times, giving thanks to others 12 times.
    Have a look in your code to see the start and finish positions of your circles. It seems that they may be different.

    As for backlash, yes ballscrews do have backlash if they are not preloaded, you will also get it from the bearings. Try cutting a square, it is usually the best way to see if you do have backlash. Also use a flat endmill not a ball. A very quick way to test is to measure the actual movements you are doing to verify them.

    If you really want to test the machine have a go at the NAS Test also known as the Circle Diamond Square:

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