Quote Originally Posted by paco664 View Post
i have to calculate a diameter of wheel I will need for a slight hollow... Due to the humongous natureof this blade...
No you don't.
Atm I stil use the 1.5 inch wheel of my belt sander for grinding hollows.
You just need to 'roll' the blade from spine to edge back and forth in order to take metal out of the middle.

Using 1 wheel is easier, but so far I have beendoing this with just the little wheel.