I've seen some grinding wheels with a center hole plugged with a grey material (?sulfur) which is then precisely bored to the shaft dimension plus a small tolerance... if you tighten the flanges on such a wheel, if it is bored slightly askew, you'll bend the shaft and everything goes wobbly.
Epoxy. If from a good supplier, the hole will be perpendicular to the faces.
Joe Gwinn
whit3rd fired this volley in news: snipped-for-privacy@googlegroups.com:
Right. Sulfur. L
Joe Gwinn fired this volley in news:070920151847203238% snipped-for-privacy@comcast.net:
If from a BAD supplier, if they've gone to the trouble of plugging and re- drilling the center hole, it's going to be as true as it needs to be.
Lloyd
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