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Chuck Loosening (Read 122 times)
 
Diana Brant
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Chuck Loosening
Sep 13th, 2021 at 3:39pm
 
I have a Nova G3 chuck and things have been going very well until the last two times I have used it.  I have a shoulder on the tenon just as I have done in the past but now the jaws continue to loosen as I am turning.  I have been using the tail stock every time.  I am only turning a ten inch inside/out project that is 3" in diameter out of poplar.  This is happeing whether I am using my traditional gouges or carbide.  Can someone please give me some advice?  I can't get anything turned because I have to continually stop and tighten the jaws.
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David Moeller
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Re: Chuck Loosening
Reply #1 - Sep 13th, 2021 at 6:41pm
 
Is the wood wet or punky causing crushed fibers? Poplar at times can be soft and fibrous.
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Diana Brant
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Re: Chuck Loosening
Reply #2 - Sep 13th, 2021 at 9:45pm
 
It was poplar that I bought from a local lumber company that deals in selling mostly exotic woods.  I don't have a way of measuring moisture content in wood.  When I started out with putting the squared end into the chuck so I could turn a tenon, it did dig into the squared corners.  Could that be the problem that the poplar has too much moisture?
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Louie Powell
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Re: Chuck Loosening
Reply #3 - Sep 14th, 2021 at 6:17am
 
Diana Brant wrote on Sep 13th, 2021 at 3:39pm:
I have a shoulder on the tenon just as I have done in the past but now the jaws continue to loosen as I am turning. 


I don't think this is all that unusual - chuck jaws can loosen.  This is more pronounced when roughing out a blank because of the vibration from the unbalanced blank, but it can also happened when finishing.  And its even more of a problem when the jaws are expanded into a mortise.

It's always good advice to periodically snug up the chuck while turning.
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robo_hippy
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Re: Chuck Loosening
Reply #4 - Sep 14th, 2021 at 10:30am
 
Well, if I am turning sloppy wet wood, I may need to tighten the chuck up while turning if it is a big bowl, like 14 inch diameter or so. Other than that, you generally won't need to tighten up with dry board stock. One problem I have noticed over the years is that the screws, that hold the chuck jaws on, can loosen up, and fall out. You should check them periodically, and keep some spares on hand. This is another reason why you can reverse a bowl and get more than usual run out. Did a demo last week up in Salem, and when putting my chuck in my box, noticed that a screw was missing, lost in the shavings.....

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Forrest Forschmiedt
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Re: Chuck Loosening
Reply #5 - Sep 14th, 2021 at 10:36am
 
Poplar is a relatively soft wood. Regardless of moisture content, I would expect some compression, especially when roughing or making aggressive cuts.

Are you using the 50mm jaws that came with the chuck? Even with a perfect tenon, working towards the end of a 10" long piece gives a good amount of leverage against the clamping force of the chuck.

Don't be afraid to put some muscle into tightening the chuck. Keep the tail stock in place as much as possible. Work on smoother, lighter cuts. Keep your tools as sharp as possible (if using conventional, not carbide insert tools).

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John Grace
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Re: Chuck Loosening
Reply #6 - Sep 15th, 2021 at 7:41am
 
Questions:
1) Are the jaws loosening from the chuck...or is the stock loosening in the jaws?
2) Are you sure your piece isn't 'bottoming' out on the chuck itself?

For what it's worth...my preference when turning something like you describe is to use Teknatool's 'tenon' and/or 'spigot' jaws.
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Ed Weber
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Re: Chuck Loosening
Reply #7 - Sep 15th, 2021 at 9:47am
 
Louie Powell wrote on Sep 14th, 2021 at 6:17am:
It's always good advice to periodically snug up the chuck while turning.

+1
When you stop and inspect the wood, the chuck, the jaws, etc, you should be able to tell what is loosening and adjust accordingly.
I should say, it's not only obvious.
It's difficult for us to diagnose the problem without actually being there.
If you see something that doesn't seem right or there's something you don't quite understand, let us know.
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