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Balancing chucks?

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bogstandard:
All you can do, is get say a 1" lump of bluetak and stick on the side of the chuck, then run it. If by moving the lump around the outside of the chuck the vibration starts to get better, then leaving the blob in position, remove half of it, if it gets worse, add some more to the original lump, by trial and error, if it is the chuck, then you should end up with it eventually being balanced.
Then it is a matter of removing metal from the backplate or chuck, diagonally opposite from where the stuck on weight is, equal to the weight of the lump.

I balance critical flywheels and rotors, but that is easy because I can mount them on a free running spindle, where the heavy bit always drops to the bottom. Unfortunately, you can't do that with a chuck.

You could try to rotate the chuck around to the next set of mounting holes, and see if that balances it out.

But other than that I can't suggest any other way of doing it.

Bogs

28ten:
I just nipped to the workshop while the kids had their sleep, and I removed the chuck from the mounting plate, and. It would appear that the mounting plate is the culprit. It is a universal mount with several sets of holes that are not evenly spaced, so I need to either drill another hole to balance it, or 'fill' the holes to balance.
At least I have found the problem!
I'm sure the lathe will great when it is sorted but that seems a long way off at the moment  :bang:

websterz:

--- Quote from: 28ten on August 17, 2009, 11:03:20 AM ---I just nipped to the workshop while the kids had their sleep, and I removed the chuck from the mounting plate, and. It would appear that the mounting plate is the culprit. It is a universal mount with several sets of holes that are not evenly spaced, so I need to either drill another hole to balance it, or 'fill' the holes to balance.
At least I have found the problem!
I'm sure the lathe will great when it is sorted but that seems a long way off at the moment  :bang:

--- End quote ---

Yup...same problem I had. I made a couple of plugs for mine and pressed them in. No more thumping noises.  :)

John Hill:
If you need to balance a wheel (or chuck I suppose) which has a suitable concentric outer you can roll it on something really smooth, a sheet of glass for example, a few times marking the point that always rests at the bottom.

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