Originally Posted by
Bryan
Chris I would think the errors from bearing noise would be tiny. Like, at a wild guess, a micron or two? For my purposes that's a theoretical issue, not a practical one. Spindle adaptors OTOH seem prone to larger problems. At least the one I made for the Graz, with all the care I could muster, runs out I think .02mm, even when registered to the spindle. I threw it in the drawer in disgust and now use a chucked centre. Even if your adaptor is perfect, or you have a centre that's native to the spindle and needs no sleeve, it still only takes a tiny ding or a speck of grit ...
On dogs, I gave up on the cast ones as they seem to twist under load. Maybe mine are in poor condition. I use a home made one consisting of ... wait, here's a pic. :- This was a quick fix that worked so well I never got around to finishing it. I'm ashamed to say it even still has the gutter bolts. The roll pin is a trick (bodge) I use if I get slippage. I grind a little groove in the shaft to engage it - only if that surface doesn't matter obviously. I can think of better solutions.