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