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  1. #1
    Hi....

    So I decided to try and mill a sphere as a test piece to check the functioning of my mill and the software I'm using. I figured a sphere would be tough - and I turned out to be correct.

    I'm using Vectric Cut3D to produce the toolpath and Mach3 to control the mill.

    I used a piece of pine 70mmx70mmx43mm and aimed for a sphere 40mm in diameter.

    However, it became very obvious on the 2nd pass that the circles being left after each pass were not concentric. I could see clearly that when Mach3 said the X-axis was at 70mm it was in fact probably 75mm!! It seems as though Mach3 no longer knew where the exact position of the mill was. I shut the mill off when it became apparent that the Z-axis had suffered the same fate.

    Here's the piece after about 12 roughing passes.

    It's a mess:



    Does anyone have any ideas why this may have occurred and possible solutions please?

    Is this backlash at work?

    Regards

    Simon
    Last edited by Lee Roberts; 04-03-2011 at 06:22 PM. Reason: Added photo.

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