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post #1 of 5 Old 12-06-2011, 09:13 PM Thread Starter
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Chuck Question?

Just bought a Super Nova 2 chuck. It came with the 50 mm jaws. What is the best size for bowl turning. It seems to hold around 2 to 3 inch bowls pretty good. But, anything larger and they sling off. Maybe I'm not doing something right. I have been mostly using the recess up into the bowl. I used a talon one time and it flew off. It could have been the wood (walnut). New to this with alot to learn. Thanks for any help you can give.

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post #2 of 5 Old 12-06-2011, 09:25 PM
Yea i got wood
 
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show pics of your chuck and bowls you are mounting
pics speak a 1000 words
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post #3 of 5 Old 12-06-2011, 09:36 PM
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Are your jaws straight or dovetailed? Need to cut your tenon accordingly. Also, your tenon should ideally be sized so that the jaws grip it at their roundest position...not all the way closed or not opened too far. Make sure your tenon is not bottoming out in the chuck. The face of the chuck jaws should have a nice flat spot on the bottom of the bowl to register against. When tightening the chuck, don't over tighten it. Tighten it snug one handed and then give one good two handed tighten and you should be good. Sharp tools and light cuts...don't force it. Ok, to steal another members tagline...that's all the free advice I can afford to give you.

Oh, and did I mention, take a class or find an experienced turner to help you...learn to do it right before you develop too many bad habits or before that chunk of wood decides to slap you upside the head.

That bowl was perfect right up until that last cut...
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post #4 of 5 Old 12-06-2011, 09:46 PM
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I agree with Robert that a picture of the problem would help.
How large (diameter) and thick (deep) are you trying to turn? Are your recesses 2-3 inches in diameter?
I cut mine where the closed jaws just fit in the opening as show in the picture. When expanded they will be at optimum holding area.
Other problems may be that the item it too thick, like 6” or more. The standard 2” jaws are not made for that much leverage.
Are your recesses too deep? The top of jaws should fit tight against the wood and the wood should not contact the base.
Did you make (or have) a tool to cut the dovetail to the correct angle? I use a old bench chisel but a large flat screwdriver will work also.
I assume the bowl came off, and not that the recess broke. You should have at least ½” of sound wood surrounding the recess and 1” is much better.
How deep sorta depends on the wood, for green wood I go about 3/8” deep.
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Last edited by NCPaladin; 12-06-2011 at 09:55 PM.
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post #5 of 5 Old 12-06-2011, 10:07 PM
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You should turn a tenon for the bowl that is shorter than the jaws are tall. This lets the wood sit on top of the jaws as well as in the jaws. It keeps the wood from rocking.
When you put a chuck on the wood the jaws compress the wood. When you turn wood it vibrates and can compress the wood more so it rocks. It will eventually work it's way out.
If you put the shoulder on the wood it helps prevent this. Another tip is to stop the lathe every now and then and tighten the chuck.
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