On Wed, 16 Nov 2016 06:49:58 -0800 (PST), robobass
wrote:


Y'think? That's 51.6% faster than your ideal. Why didn't you slow
down the lathe? Or did that speed work best with the density of the
larger diameter brush?

Jawohl, Herr Jaques! I slowed down the lathe to 550 for the 10" wheel, and everything works perfectly now. This wheel should last for years, so I will stop fretting about finding 3" wheels that are real brass.

Great. Glad I could help. It's amazing the simple things we can
overlook, or perhaps, are too lazy/hesitant at the moment to change
things.

I don't know why I didn't try to match the surface speed when I got the big wheel. I guess 550 just seemed so slow!

I was going to mention that, but you said "everything works perfectly
now" so I let it alone. 705rpm is your ideal speed, unless the
density of the brush changes that.

--
I have never understood why it is "greed" to want to keep the money you
have earned, but it is not greed to want take someone else's money.
--Thomas Sowell