Round or Octagonal Inserts

shell70634

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I have a face mill that uses either round or octagonal inserts. When would I select one over the other? Is the octagonal considered a roughing insert?
 

shell70634

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It's made by LMT and it does take either according the the manufacturer.
 
Last edited:

pstemari

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Odd, yes I see that at MSC.

Yes, I would assume that the round ones give a smoother finish *iff* they don't chatter. They make a very wide cut, which generates a lot of force.

I would expect the octogonal ones to have better support, though.

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FOMOGO

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Seems I just read somewhere that round are used for roughing. Mike
 
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