I've been offered a surface grinder

[Sunset Machine]

I just lightly push mine squarely up against the side of the grinding wheel and clamp it down, making sure the wheel clears on all four sides of the chuck.

Had to regrind the chuck after a removal a while back. Kept burning. Didn't do that before, what is wrong??? Turns out that the wheel had worn to 6 inches. I was able to compensate by whippin' the table back and forth as fast as possible. Oh, my aching arm.

Wheel diameter makes a difference.