Half of the circle is perect and the other half is not (SOLVED)

Can someone explain mi this?

Half of the circle is perect and the other half is not. there is no physical obstruction.
the machine passed twice through the same erroneous route

Check that your belts and v wheels are tight

Overload of some sort. Feeds and rpm? The cut doesn’t appear to be smooth, is the bit dull / rpm to high??

I am pretty sure if you where to run the same circle with the bit just above the material it will be a true circle.

Hi guys
thanks for your help
I found the problem
a small piece of metal stuck in the bearings of the X axis.

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