Reply by SPalm

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Posted on Sharpening Lathe Tools

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5320 posts in 3879 days

#1 posted 12-20-2012 04:48 PM

I have the same problem. Done some lathe work for years – old tools – not sure about sharpening.

I was just looking at the instruction manual for the Wolverine and wondering about slow speed grinders. Use high speed is what they suggest.

Our Recommended Grinder
8” @ 3450 RPM

This gives an optimum speed of
7225 surface feet per minute with a
new wheel and an acceptable speed
of 5740 sfpm with a wheel considered
worn out at 6-1/2”.

Why a 3450 rpm Grinder?
Manufacturer recommended speed
in surface feet per minute (sfpm)
for grinding wheels is between
6000 and 8000 sfpm:
6” at 3450 rpm = 5419 sfpm
(at 1725 rpm = 2709 sfpm – too slow)
7” at 3450 rpm = 6322 sfpm
(at 1725 rpm = 3161 sfpm – too slow)
8” at 3450 rpm = 7225 sfpm
(at 1725 rpm = 3612 sfpm – too slow)

But what do I know?

-- -- I'm no rocket surgeon

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