TNMG vs TNMM

elninio · Jul 11, 2013

Is TNMGon a flat carbide seat (some carbide seats are made to match the chipbreaker, providing support all the way to the periphery) noticeably weaker than TNMM? Different inserts have different chipbreakers, and I usually don't have matching carbide seats. I am using them to cut hard materials.

mrainey · Jul 11, 2013

In my experience, a flat-bottom insert (M style) supported by a flat seat is significantly stronger than any comparably-sized G style.

PixMan · Jul 11, 2013

Any single sided insert sitting on a new carbide seat is going to be more stable than an equivalent shape double sided. Chipbreaker patterns that are used repeatedly in a toolholder will eventually leave their impression on the seat. When you change to a new chipbreaker design and want to judge tool life it's best to put a new seat in the holder.

If you are looking to get strength in an insert for roughing, you'll gain far more by going to a round (R), 80º parallelogram (C) or square (S) shape insert over that triangular (T) you show.

elninio · Jul 11, 2013

TNMM are harder to find on ebay than TNMG, so how are people using all these tools --- do they all have the appropriate chipbreaker seats and holders, or is the strength of a flat seat unnoticeable (perhaps they are mostly using high-feed instead of heavy cuts, perhaps coating thinning occurs prior).

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TNMG vs TNMM

elninio

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elninio

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