Surface Grinder Wheel Vibration

I bought a 6 X 12 Boyar Schultz Manual Surface grinder and mounted an ENCO 1/2 x 7 wheel. The wheel had some bad vibration so I replaced the
spindle bearings. I have three Enco wheels and some vibrate more than others, the wheels have the letters BAL painted on them so I expected that indicated they were balanced. I was a Tool & Die Maker in the late 50's and spent a significant amount of time using the 6 X 12 Boyar Schultz manual grinder. I never experienced a vibration and am not sure where to begin sorting out this problem. The ENCO Wheels were not very expensive and I wonder if the problem is the inexpensive wheel or the drive mechanism. Any suggestions are appreciated. Thanks ....Al Basham
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Is the spindle motor 3phase? Are you generating it with a static converter?
Wes
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Al wrote:

Try a new wheel? Jeez, wheels cost what, eight bucks? What did those spindle bearings set you back? I remember doing the ones on my KO Lee, think they were about $400 .. yow.
Grant
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Wheels will generally need balancing after you first mount and dress them. Does the grinder have balancing weights on the wheel arbour?
Mark Rand RTFM
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Mark -
Can you give a short description on how to do just the balancing mode with the sliding weights on the spindle nut.
Martin
Martin H. Eastburn @ home at Lions' Lair with our computer lionslair at consolidated dot net TSRA, Endowed; NRA LOH & Patron Member, Golden Eagle, Patriot's Medal. NRA Second Amendment Task Force Charter Founder IHMSA and NRA Metallic Silhouette maker & member. http://lufkinced.com /
Mark Rand wrote:

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Considering you find variations in the vibration by changing wheels, you may not have a problem with the machine, but don't discount the possibility. If it runs on single phase, that alone can introduce vibration, as can the belt, assuming the spindle is belt driven. If the original motor was replaced, look there very first. A common electric motor should not be used on precision grinding equipment. Also, make sure you're tightening the wheel adequately, and that you have a blotter under each side. Don't over tighten, that's not necessary, nor desirable. Hand pressure on the provided spanner should be more than adequate-----assuming you've holding the wheel with the other hand while tightening.
If you find the wheels do not run true on the sides, don't hesitate to dress them with a diamond. Dress all the way to the blotter until you've trued each side. That should make a serious improvement in how the wheel runs. You'll do nothing to harm the wheel, assuming you take light passes (a few thou each pass).
Harold
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Hi- I hgave a B.S.6x12, single phase, belt drive and I have never had to balance a wheel or true the sides. Jim
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