If I read your advertisement correctly, the cutter is ~2” in diameter.
Comparing this to the use of a dado blade on a table saw, the dado blade would spin around 3,400 rpm. Maybe you can compare an 8” blade run at 3,400 rpm has the same surface feet/minute at the cutter as a 2” blade running around 13,600 rpm. But that is scary to me.
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Keyway cutters on milling machines are also similar. The recommended surface feet/minute for these on plastic is 200 (
https://internaltool.com/docs/reference/saf-keyway-cutters.pdf). That equates to a 2” cutter spinning at
200 ft/min * 12 in/ft / (2 * pi in/rev) = 389 rpm
Note: I welcome any input a machinist may have for this.
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The drilling charts say that a 2” Forstner bit should be revolved at 500 rpm. Other large cutters have similar speed recommendations when drilling.
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It seems to be well balanced, but it will still be cutting only a small part of the rotational circle; Maybe only 10° of the circle, leaving 350° spinning in the air.
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Regardless, I believe that running this cutter at 12,000 rpm will be too fast and probably unsafe.
If I were to use such a cutter in a
drilling spindle on my rose engine, I’d run the bit at a speed around 200-500 rpm.