Longworth chuck

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Project by Paul Jenkins posted 05-09-2015 09:37 AM 2703 views 11 times favorited 7 comments Add to Favorites Watch

I’ve made one or two bowls where its only been after the fact I’ve realised I can’t finish the bottom because my cole jaws aren’t large enough, so it was time to build a longworth chuck!

Longworth hardware ‘kit’ + phenolic resin coated plywood + 4” faceplate. Much cheaper than the several hundred needed for the same size.

Lesson learnt: don’t think “good enough” is good enough when it comes to accurately marking out. I should have found my dang good compass and used that rather than the awful stanley one. Cumulative errors added up to me needing to use M6 bolts instead of the supplied 1/4” bolts for it to slide easily.

Video of construction, for those interested.

7 comments so far

View JoeinGa's profile


7739 posts in 2243 days

#1 posted 05-09-2015 12:12 PM

Nice job!
Once I get the new lathe in and set up, I’m gonna hafta make me one of these bad boys!

Adding to favs!

-- Perform A Random Act Of Kindness Today ... Pay It Forward

View lew's profile


12495 posts in 3991 days

#2 posted 05-09-2015 08:52 PM

Nice Work! The coated plywood will make adjustments much easier.

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

View woodcox's profile


2187 posts in 2248 days

#3 posted 05-10-2015 05:45 AM

Thanks for this sharing this Paul. On assembly when aligning the slots for the bolts, is it long slot to long slot or long slot to short slot? Also, when chucking up a bowl do you tighten the bolts in an alternating sequence? Finally, is there a recommended maximum rpm for your longworth?

-- "My god has more wood than your god" ... G. Carlin.

View Paul Jenkins's profile

Paul Jenkins

41 posts in 1851 days

#4 posted 05-10-2015 06:21 AM

@lew I just love the colour – I want to make all my jigs out of it!

@woodcox long slot to long slot. I’ve heard people go both alternating sequence or sequentially. I think so long as it is good and tight and you’re being sensible it probably doesn’t matter too much. Just like cole jaws or any other reversing jaws, erring on the side of caution is usually a good idea – light passes and ‘lowish’ RPMs. For mid-to-large bowls, 600rpm or lower is what I’d be aiming for.

View Diggerjacks's profile


2290 posts in 3375 days

#5 posted 05-10-2015 05:04 PM

Hello Paul

Very nice and instructive video

What is the diameter ?

In my favorite to make one in the future weeks

Thanks for sharing

-- Diggerjack-France ---The only limit is the limit of the mind and the mind has no limit

View Paul Jenkins's profile

Paul Jenkins

41 posts in 1851 days

#6 posted 05-10-2015 08:46 PM

My chuck is about 400mm, because the swing over my lathe is ~406mm (16”). It just barely clears the lathe ways. I could have swung my lathe headstock to do outboard turning, but I don’t think its likely that I’ll be doing bowls that large for awhile.

When you make it, just be sure to measure your lathe to make sure it’ll fit on!

View Jim Jakosh's profile

Jim Jakosh

21953 posts in 3341 days

#7 posted 05-10-2015 10:29 PM

Very nice job on that chuck. I have one and it sure comes in handy some times. you’ll love using it.


-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!! Variety is the Spice of Life!!

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