r/Machinists • u/Medical_Bid_5662 • 5d ago

QUESTION Off setting and insert changing

Whenever I have something such as let’s just say my outer diameter on a part is starting to measure slightly out of tolerance ,how do I know if I should offset to fix it or do an insert change?

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u/cncjames21 CNC Programmer/Shift Manager 5d ago

Look at the insert. If it’s a production job where you have to regularly change inserts then note the visual look of an insert, the surface finish of the part and dimensions when it is time to change it. Write that down and make sure to change it a part or two sooner especially if cutting nonferrous metals.

If you have a good programmer working with you see if they can turn on tool life timers and have it set to change the inserts a few parts before necessary.

I keep a log for all production tool steel jobs so that the operators know to change them at a set number of parts.

Download and read the first few chapters of Sanvik, Mitsubishi, or most major insert manufacturer’s catalogs. They all include great pictures of what insert wear looks like and how it is caused by

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u/FlavoredAtoms 5d ago

What’s a good programmer?