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Forum topic by Dustyjosh posted 12-29-2012 08:58 PM 686 views 0 times favorited 8 replies Add to Favorites Watch
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Dustyjosh

5 posts in 706 days


12-29-2012 08:58 PM

Topic tags/keywords: turning big bowls finishing work large chuck jumbo jaws

Hello friends! Thanks again for the advice on chucks. Ended up with PSI beginner one and its working just great. Today’s question is about finishing the bottom of a big bowl 10”-16” in diameter. When i an working on a smaller diameter bowl 4-8” after separating the bowl from the tenon I simply turn it around and grab with PSI Jumbo Jaws and clean up/sand the bottom. How can I do the same thing with a much larger bowl? Homemade holder? Other thoughts. As always I am grateful for you insights. Best, dustyjosh


8 replies so far

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Wildwood

1118 posts in 830 days


#1 posted 12-29-2012 09:15 PM

Ever heard of a jam chuck or donut chuck?

Check out chucks at: http://www.woodturningonline.com/Turning/Turning_articles.php?catid=9

-- Bill

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lew

10100 posts in 2451 days


#2 posted 12-29-2012 09:49 PM

I like to use one of these-
http://www.woodworkersguide.com/2010/10/17/how-to-make-a-longworth-chuck/

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

View mpax356's profile

mpax356

46 posts in 1188 days


#3 posted 12-29-2012 10:42 PM

I showed more than one way to handle this in my video you can link to from this thread http://lumberjocks.com/topics/44404

-- MPax, Atlanta

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MonteCristo

2097 posts in 884 days


#4 posted 12-30-2012 03:30 AM

A vacuum chuck with a big drum is expensive but solves this problem (and many others !).

-- Dwight - "Free legal advice available - contact Dewey, Cheetam & Howe""

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RVroman

163 posts in 720 days


#5 posted 12-30-2012 03:43 AM

For bigger bowls an “internal tenon” (not sure what the correct terminology for this is) works well. That way once you finish the outside and turn it around you never have to reverse it.

-- Robert --- making toothpicks one 3x3x12 blank at a time!

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tamboti

207 posts in 1837 days


#6 posted 12-30-2012 08:22 AM

Hi Look at projects and look for longworth chuck made by quatersawn this will solve your problem regards Tambotie

-- Africa is not for sissies

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ldl

1135 posts in 1061 days


#7 posted 01-01-2013 03:53 PM

Does the longworth chuck do good from the inside on bowls that are tapered in from the top.

-- Dewayne in Bainbridge, Ga. - - No one can make you mad. Only you decide when you get mad - -

View Jimbo4's profile

Jimbo4

1149 posts in 1459 days


#8 posted 01-01-2013 06:11 PM

Longworth chucks: Whenever the chuck is expanded / contracted use nylon lock nuts on the back. I have found, when the chuck is in operation it will slowly expand, due to centifigul force, and the object being turned will come loose. After you adjust the chuck for use, tighten the lock nuts and all will be ok.

Dewayne: The longworth will work in expansion mode also. See above.

-- *Arachnoleptic Fit*: The frantic dance performed just after you've accidently walked through a spider web.

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