chuck problem - Woodworking Talk

jeepturner · 05-21-2009, 12:47 PM

I bought a chuck a few months ago from Grizzly tools and the other day i was wroking on a small bowl and i noticed that the check was spinning out of round. I removed the bowl and ran the lathe with just the chuck, the jaws are spinning out of round. Everything is tight, and its only the half of the chuck that the bowls would mount to that is spinning out or round if that makes sense. Any input

Here is a link to the chuck
http://www.grizzly.com/products/4-Ja...x-16-TPI/G8783

thanks Jason

john lucas · 05-21-2009, 03:30 PM

I assume your talking about the chuck jaws being out of round. Is this with them tightened against each other. Grizzly's chucks have a lot more slop when the jaws are loose than my vicmarc chucks. When tight they run true. Check all the screws and make sure the ones holding the jaws on are tight.

The woodsman · 05-21-2009, 09:42 PM

I don't know how much this really effects a chuck,but I was told when I first started turning to make sure the jaws are in the right position.My nova chucks are numbered an you supposed to make sure the numbers on the jaws an the chuck match up. Then before you completly tighten the screws snug the jaws up against each other ,then tighten the screws down tight.Hope this helps.

Ken

PTownSubbie · 05-21-2009, 09:44 PM

Jason,

I would take the chuck jaws back off and make sure there is nothing lodged under them that would cause them not to close all the way.

Then make sure you hand tighten the screws very loosely. Close the jaws until they just touch and then tighten the screws all the way.

Also, make sure the jaw faces are matched to the correct place on the chuck. They should be match marked.

Hope this helps.

john lucas · 05-21-2009, 10:28 PM

First take the jaws off and tighten the inner jaws until they touch. They should form an even square or circle depending on how they ground the tips. Then do as mentioned above, put the jaws back on with the screws just a tiny bit loose. Tighten the jaws until they touch and the tighten the screws.
On vicmarc chucks the jaws are numbered but they don't have to go back into the same order. The vicmarc rep told me with CNC machining the jaws match so there isn't any reason to put them in order. They put numbers on the jaws because thier clients were used to that and felt they needed them. I've tried it and mine run true in any position.
My early Nova chuck did recommend putting the jaws in the correct position but that chuck at the time was the least expensive on the market and that was about 10 years ago or so.

The woodsman · 05-22-2009, 10:55 AM

Quote:

Originally Posted by john lucas

First take the jaws off and tighten the inner jaws until they touch. They should form an even square or circle depending on how they ground the tips. Then do as mentioned above, put the jaws back on with the screws just a tiny bit loose. Tighten the jaws until they touch and the tighten the screws.
On vicmarc chucks the jaws are numbered but they don't have to go back into the same order. The vicmarc rep told me with CNC machining the jaws match so there isn't any reason to put them in order. They put numbers on the jaws because thier clients were used to that and felt they needed them. I've tried it and mine run true in any position.
My early Nova chuck did recommend putting the jaws in the correct position but that chuck at the time was the least expensive on the market and that was about 10 years ago or so.

I got the super nova 2 last yr,not cheap,but was on sale and they still do recomend you do that.
Ken

HLW · 05-22-2009, 12:35 PM

I'll have to agree with the "Woodsman". I was told that the factory puts the numbers on the jaws for a good reason. Balance ! You have to match the numbers because each jaw will not weigh the same. You can can relate it to putting weights on tires for a smooth ride. But that might not be the case with your chuck. Spin it without the jaws on it and see if it shows a wobble. That's just my unprofessional opinion !