Rest Machining issues with 1/4 bit

This is the third project in which I use a 1/4 inch bit with rest machining function and a 1/8 bit. However, the 1/4 bit is going beyond in some corners, as you can see in the image below.

The project is large, and there is enough space to pass the 1/4 bit, but this problem is still occurring. Any recommendations? My solution has been to not use the rest machining option and instead use the 1/8 inch bit throughout the entire project, which has been taking much longer.


Thank you

Upload the .c2d file?

Could it be that the machine lost steps?

Which machine do you have?

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That kind of looks like mechanical issues. What kind of machine? If it is belt drive, check the drive pulleys - each should have two screws, both tight, one over the flat part of the motor shaft.

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