I'm to the point of turning the drive wheel for the belt grinder I'm building for my son. It'll be 6061 Al, 6" dia. x 2" wide, running on a 3/4" keyed shaft, and turn up to 3800 rpm. I figure I'll put a setscrew on the key and another at 90 deg., which will require drilling from the circumference. I can drill holes opposite to help balance.
Any suggestions on how to balance this for a hobbyist? I'm not buying a balancer, but could build something. Or just spin it up and see how it does? Thanks.