Another chapter in the saga of the Ryobi BGH827 8" bench grinder, which vibrates badly.
The basic problem appears to be that the grinding wheels are not reliably held perpendicular to the arbor shaft, and also can slide about radially perpendicular to the shaft.
It occurred to me that I could solve or at least greatly reduce this wiggling problem by machining a combined dished washer and sleeve (0.625" ID, 1.000" OD) in one piece, sharply reducing the ability of the wheel to move in undesired ways. Today, I machined the first such flanged sleeve from 6061 aluminum. The sleeve protrudes 1" from the flange (~2.75" diameter), and the sleeve is a tight slip fit on the shaft. The flange face is undercut, and so rests on the stone only in a ring, just like a dished washer. The vibration is much reduced. So far so good.
Next I'll make another flanged sleeve for the other wheel. Hmm. If it has a 1" hole, leaving sufficient space for the sleeve.
And re-dress both wheels, as they were dressed wrong before: I would dress them to what seemed like true, but it was really wobbling. This would have been OK, except the wheel would then shift on the arbor, doubling the wobble. Maddening.
I suppose it could be useful to make flanged sleeves to accept wheels with 1.25" center holes, or larger.
I've never had the opportunity to take a Baldor grinder apart. How are the wheels attached to the arbors? Are the dished washers machined? Are they keyed to each other and/or the arbor shaft? What manuals I've seen are not clear. Does anybody have pictures? I've always imagined that all that Baldor really does is accurate machining of arbors designed so that they don't let the wheels wiggle around.
Joe Gwinn