well I have an "old tool" with a pig tail, that has multiple speeds via 
pulleys and n which I mounted two 10" wheels.  You can usually pick 'em 
up cheap at yard sales.  It's a repurposed head from a very old  mono  
tube lathe.   I hated the lathe so I just re-purposed the head stock

Discussing RPM is unhelpful since it  is SFM that matters and nothing 
more.  I don't know the numbers on that head stock but I can run u it 
really slowly so things don't burn.  However cutting rates suffer so I 
went with a water drip.