Both my 8" HF grinder and my 6" HF grinder shake badly.? The 8" was mounted on a heavy stand and it still ran across the floor unless I loaded down it down with weight...and that was *after* truing the wheels.? During my "rebuild" I found that one end of the shaft is bent (from the factory!) about 8 thou where the wheel mounts.? I'm now trying to get that side down to under 1/2 thou like the other side.? The internal plastic fan blade was also not installed true, but that was an easy fix.
The problem with *only* squaring up the shoulders where the washers mount is that they're really thin, like 15 thou high if I remember correctly.? The tip from the Harold Hall book was to mount larger collars on the shaft to have something more substantial for the washers to rest against.? Great that you got yours smooth without having much trouble.
