[chronomill]

Hello,

I think I'm missing something. I've been cutting MDF and abs with success but I have difficulty getting accurate cuts in only one pass. If I run my code three times I get somewhere close to the correct distance.

For example, a 9mm hole will come out at 8.6mm at the first pass and end up at 8.95mm after the third or fourth pass. I need to mention that what I call a pass actually is three times going around the hole circumference.

Could that be an end mill issue, I'm using some Chinese end mill? Machine is functioning properly and calibrated properly.

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[ger21]

Sounds like a machine rigidity issue.What kind of machine is this?

[chronomill]

What kind of machine is this?

Chinese CNC 3040 with 800W spindle.

[jahnj0584]

yep thats it. Add finish passes in your CAM. The larger end mill will also help, hopefully. Reduce your bore stepdown as well