answer for e-tek about power:
I have it mounted on a model 510 Shopsmith, which has a 1 1/8 HP motor and uses mechanical variable pulleys to vary the speed from 700 to 5200rpm.
I also used 2 degrees of crown on the idler pulley.
Here is a pic of the mounting on the Shopsmith:
I'm the author of that "Nifty Belt Grinder" article. Thanks for the kind comments. I have been using it since for light work ( cleaning up edges cut by my 4x6 band saw, sharpening chisels, etc) and like it so much, I sold the Shopsmith strip sander I had.
Here is the cover pic:
I would be...