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Tool Talk Discussion Forum

Lathe chuck

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Dusty MI

09-10-2015 11:32:47




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I have an old Seneca lathe, 6" swing, 60" bed, or something like that. The 3 jaw chuck has gotten hard to open and close. It feels like it needs to be taken apart and cleaned. I took all the allen screws out but do not see how it comes apart. Shouldn't it come apart when all the screws are out ?

The chuck looks like the one on the lathe that Lance pictured.

Dusty




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Dusty MI

09-12-2015 04:59:36




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 Re: Lathe chuck in reply to Dusty MI, 09-10-2015 11:32:47  
I got it all apart yesterday, cleaned it up and greased it, put it back together. The jaws will close without to much of an effort, but it is hard to close them. It appears that the problem is with small gears that turn the scroll gear, and I didn't see a way to get them out. They seem rather loose.
I can e-mail pictures, but don't post them.
Thanks,

Dusty



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dr sportster

09-11-2015 09:38:08




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 Re: Lathe chuck in reply to Dusty MI, 09-10-2015 11:32:47  
If it is 1inch 8 tpi I have a 6 inch in an eBay auction rifght now. Jaws are copper coated steel.6inch diameter 3 jaw.



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DGinVT

09-10-2015 17:45:45




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 Re: Lathe chuck in reply to Dusty MI, 09-10-2015 11:32:47  
On the back side of the lathe chuck there shud be 3 screw holes. You screw in a bolt into each hole and slowly tighten each bolt which will separate the the chuck's back plate from the chuck itself. All my chucks have these holes. Make sure that you have carefully marked each piece for re assembly. Do not force any of the parts. A note of caution never use an air hose in cleaning the chuck as it will cause chips and other material to lodge in the scroll and jamb the jaws. Each jaw has its own slot.

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TimV

09-10-2015 17:29:30




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 Re: Lathe chuck in reply to Dusty MI, 09-10-2015 11:32:47  
Dusty: without a picture, it's hard to give specific advice, but in general, you mark the jaws and the body (common practice is 1, 2, and 3 dots on each piece with a center punch corresponding to jaws 1,2 and 3), mark the lathe body with an indicating mark on each side of the split line (or lines, some chucks have more than one) remove the allen screws holding the body together, and separate the pieces. They're usually a tight press fit--a lead hammer can come in handy, as they're less apt to mark or distort things than a brass one. The video below is by Tubalcain--one of the better known Youtube lathe guys. He's long-winded, but the info is good.

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ObsoElitist

09-10-2015 16:56:13




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 Re: Lathe chuck in reply to Dusty MI, 09-10-2015 11:32:47  
Not sure, no photo, but you probably have to remove the chuck and then take the back plate off. Make sure to mark it so it the two halfs go back in the same spot



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rustyfarmall

09-10-2015 14:33:43




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 Re: Lathe chuck in reply to Dusty MI, 09-10-2015 11:32:47  
Those jaws should come all the way out. Just keep opening the jaws until they are free, then you can apply oil to the scroll. The jaws should be numbered, with a corresponding number on the chuck. Number 1 goes in first.



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Dusty MI

09-10-2015 14:39:50




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 Re: Lathe chuck in reply to rustyfarmall, 09-10-2015 14:33:43  
I've had the jaws out but would like to get to the scroll.

I'll take the jaws out again see what I can do from there.



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