help id this chuck

bigcrunch · Mar 25, 2010

Hello all, I need some help identifying this lathe chuck, trying to locate a adapter to an A1-6 spindle.
15.75" OD
7.75" dia in rear recess for mounting adapter
3.2" bore
4 hole mounting 6" dia pattern 5/8" holes

only marking I could find is 5 939 T700

many thanks for your assistance,,,
links to pics

http://i307.photobucket.com/albums/nn315/bigcrunch69/101_0397.jpg
http://i307.photobucket.com/albums/nn315/bigcrunch69/101_0396.jpg
http://i307.photobucket.com/albums/nn315/bigcrunch69/101_0394.jpg
http://i307.photobucket.com/albums/nn315/bigcrunch69/101_0398.jpg
http://i307.photobucket.com/albums/nn315/bigcrunch69/101_0403.jpg
http://i307.photobucket.com/albums/nn315/bigcrunch69/101_0406.jpg

JRIowa · Mar 25, 2010

The taper is A-11 but the bolt circle is wrong. Should be 3/4 holes on a 6 1/2" BC.

Don't know what brand it is. Most of the American made 4-jaws like Skinner, Cushman, etc all had back plates to keep them clean and balanced. Pratt-Burnard, Forkhardt or another European. Whatever it is, it's oddball. Just get a flat adaptor plate and machine to fit. You'll have to index the holes so they don't run into each other.
JR

Limy Sami · Mar 25, 2010

Yep, it looks like a plain back chuck to me as well, just do as JRIowa suggested.

Forrest Addy · Mar 25, 2010

Probably have to make an adaptor. But hey! We're machinists, right. That's what we do.

bigcrunch · Mar 25, 2010

hi all, I check the measurements again, they are correct not a A-11 I printed those dimensions from multiple internet sites and compared.
The recess is only .25 deep not tapered. A real odd ball I have.

DieselPower · Mar 25, 2010

I have that exact same chuck. Mine came on a 1950's swedish engine lathe I have. I never liked it, the jaws and screws are not very hard, and mine's wore slap out. Some of the screws extend 1/2" past the chuck body now, and I had to build up the collor with weld to pull them back in and keep them from hitting the ways. You are correct, it is just a plain back, and you will need to make your own backplate. but I don't think it would be worth it, give it to a farmer and buy a good one on ebay.

When I was using mine, it would take me 5 or 6 minuts to dial a part in to about .002, now that I use a 12" cushman, it takes me 20 seconds to dial in to .0005

Just my 2c!

bigcrunch · Mar 25, 2010

Dieselpower, do you know the brand?

DieselPower · Mar 25, 2010

No, mine is unmarked too, but the lathe was made by arosverken, who are famouse for their punch presses

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help id this chuck

bigcrunch

Aluminum

JRIowa

Diamond

Limy Sami

Diamond

Forrest Addy

Diamond

bigcrunch

Aluminum

DieselPower

Cast Iron

bigcrunch

Aluminum

DieselPower

Cast Iron

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