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4 jaw lathe chuck

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Forum topic by Sawdust2 posted 07-20-2009 03:53 AM 877 views 0 times favorited 5 replies Add to Favorites Watch
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Sawdust2

1467 posts in 2777 days


07-20-2009 03:53 AM

Topic tags/keywords: lathe chuck toothpick holder question lathe

I recently got a 4 jaw chuck for my Carba-Tec.

I’m trying to turn some toothpick holders.

Instructions say to turn a 1/4” tenon on the rounded spindle and put that tenon in the chuck.

Did that. Won’t stay. Made it 1/2” tenon, still won’t stay.

Should I have a taper on the tenon? Wider at the base narrower near the spindle? Other way around? Deeper tenon?

I’ve watched the videos at Wood magazine and he doesn’t seem top have this problem.

Lee

-- No piece is cut too short. It was meant for a smaller project.


5 replies so far

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lew

10094 posts in 2445 days


#1 posted 07-20-2009 04:45 AM

What brand of chuck do you have? I think the 1/4” refers to the length of the tenon. The diameter of the tenon should be about half the size of the chucks max/min opening range. Also, I find it helpful to use the tail stock center to help hold the piece I am turning for as much turning as possible.

-- Lew- Time traveler. Purveyor of the Universe's finest custom rolling pins.

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Sawdust2

1467 posts in 2777 days


#2 posted 07-20-2009 01:12 PM

It’s the Barracuda from Penn State Ind.

As the top of the toothpick holder gets a hole drilled in it I will also use that.

Thanks.

Lee

-- No piece is cut too short. It was meant for a smaller project.

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lew

10094 posts in 2445 days


#3 posted 07-20-2009 07:47 PM

That is similar to the chuck I’m using.

I find that turning the tenon so that it has a slight flair, to match the inside of the chuck jaws, also helps hold the work piece more securely. My chuck doesn’t hold long pieces very well. That’s why I use the tail stock to do most of the turning and then back the tail stock out to finish up and sand.

Another thing that helps me is to make sure the tenon is not long enough to bottom out on the inside of the chuck. I think you get more support by having the work piece “sit” on the top of the jaws- just my opinion.

-- Lew- Time traveler. Purveyor of the Universe's finest custom rolling pins.

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a1Jim

112326 posts in 2267 days


#4 posted 07-20-2009 10:35 PM

Not very helpful here. when I first started reading this post I thoughrt you were saying you were having trouble turnug a tooth pick. Us old guys we have to read things twice.

-- http://artisticwoodstudio.com Custom furniture

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peruturner

317 posts in 2052 days


#5 posted 10-06-2009 05:55 PM

Just look at your jaw shape and make the tennon to that

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