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Price and location?

It's been my experience that torque drops with lower rpms on a vfd. At least this is true with the 2.2kw 24000rpm motor on my router and the 3600rpm motor on my mill. Both are 3 phase, the former is 400hz and the later is 50hz.

I am a machinist and run various inserts daily on multiple lathes and mills. The majority of our tooling is Sandvick, we also run Secco, kennametal, HSS and hand ground carbide. In my home shop I use tooling from China exclusively. I would rank the tooling as follows: 1. Kennametal/Secco 2...