I'm new here!

[firewizerp]

Thanks for the suggestion of removing the jaws and then leveling them! That may be my most effective solution!

While I agree with gunner312, I have had "acceptable" results removing the jaws and using hand made clamp/jig to resurface. I've used both a grinder and a flat table, prefer the flat table you have better control.
The use of acceptable is a relative term, based on your individual expectations

[falang]

Thanks for the welcome, Jon!!
My next project is to finish making a tool post grinder so that I can clean up the chuck jaws on my ancient South Bend lathe. The old 8" three jaw chuck has small but serious damage to the jaws that prevent proper centering of the work piece. Regrinding the jaws should correct most of the problem. Making a small cylinder to clamp in the jaws for this purpose will be a challenge as the jaws must protrude through slots cut into the cylinder. Those slots must be perfectly 120 degrees apart and of uniform width. Any thoughts on how that can be accomplished? I do have a rotary table.

I've had to grind jaws in the past but like others here don't recommend it. The results aren't worth the effort.When the jaws are so far gone the rest of the chuck is usually in poor shape too. A four jaw can obviously work but can be take a little more setup time. If I were you I'd invest in a set of soft jaws. These can last a long time and many, many jobs, especially if you are using them for internal clamping. They aren't too expensive and you have guaranteed accuracy. Really, soft jaws can get good results from even the oldest machines used wisely. If you can afford it get 2 set, one to machine internally and one externally.

[Iconoscope]

I don't expect perfection in any 3 jaw self centering chuck, but this one as it now stands is unusable. Nothing top lose!!

[juan_alberto_13]

It is interesting to see people who know I love the subject and I congratulate them, I would like to comment some things about my project but my English is very bad and I am writing or reading through a translator. A hug from Colombia

[Iconoscope]

It is interesting to see people who know I love the subject and I congratulate them, I would like to comment some things about my project but my English is very bad and I am writing or reading through a translator. A hug from Colombia

Thanks! And your English is just fine!!