X axis out of tolerance

Hello, I have a quick question for you guys. If you can help me, please, I had to make a Pocket an exact. size 11 3/4 by. 9 1/4. After the pocket was completed. the Y direction which was the 9 1/4. was exactly right, but in. the X direction it. was out by .060" I thought at first it might be some cutter deflection, but I would have seen that on the Y direction. and it was only an MDF board. Thanks for your help in advance.

Have you calibrated for belt stretch?

I’m not entirely sure how to do that. I just make sure it’s still tight or is there a proper process?

See:

https://carbide3d.com/hub/faq/belt-stretch/

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Thanks William that worked out good for me, it’s good now.