I finally got around to making two sets of flanged half-sleeves that fit nose-to-nose, two to a grinding wheel with the wheel between. This pretty much tamed the vibration. What remains appears to be due to slight warpage of the wheels themselves. I'll dress them true when I have time to drag the grinder outside (so the resulting cloud of grit doesn't coat everything in my shop).
I have taken photos and on Monday (9 Mar 09) submitted the resulting three files to the Dropbox. Nothing has turned up yet. Nor do I see anything after 2 Mar 09, so I assume that the Moderator is busy.
The files will be:
While taking the photos, I found that using a textured background helped the autofocus camera a lot. Cameras are not really designed to focus on shiney metal, and can become confused. With my camera, an Olympus eVolt, it is also essential to use Macro mode (the symbol on the camera is a stylized flower).
What also helped a lot was to use a slave flash to fill the room with light, triggered by the pipsqueak flash on the camera. The slave flash is pointed away from the camera at the wall and ceiling to the left of the objects in the photos.
I used an old studio flash (from my photo hobby days) turned down to minimum power, but edison-base AC slave flashes are cheap and common. One just screws them into a ordinary lamp, and fires away.
.Joe Gwinn