Home made Longworth chuck

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Blog entry by higtron posted 11-02-2014 10:01 PM 2258 reads 1 time favorited 5 comments Add to Favorites Watch

I got the idea to build a Longworth chuck when I watched a video of Jason Beam make one on his home made CNC machine when I saw it I knew I could make one with my router and, a home made trammel jig.

I laid everything out on some particle board than made some test cuts to see how it would work out for the final cuts on the 1/2” baltic birch ply.

I mounted the face plate on a blank of the baltic birch ply with 1/4-20 T-nuts than mounted the blank to my lathe slid the tail stock over until the live center made contact tightened it down turned the hand wheel until I made a dimple on the ply now I had my center and took the face plate off. Than I laid the every thing out with my compass onto the blank screwed that to the other baltic birch blank and a sacrificial blank took this over to my drill press and drilled the 1/4” holes for the pivot points of the arcs and, the outer perimeter of the chuck.
I bought some #6 1/2 solid rubber bottle stoppers I needed a 1/4” inch hole centered perfectly in the middle of each of the eight stoppers so I needed a jig for that the tapper on the stoppers was around 7 deg. so I planned some 2×6 down to the height of the stoppers ripped some strips down to the 7 deg. bevel and cross cut the middle strip to the same bevel mounted the strips to some scrap ply using one of the stoppers to align the the drilling jig with my brad gun.

Here is the finished Longworth cuck

-- A friend will help you move, a good friend will help you move a body

5 comments so far

View stefang's profile


15512 posts in 2756 days

#1 posted 11-02-2014 10:31 PM

Excellent work, it came out very nice and real handy! I have been intending to make this chuck for a long time, but haven’t gotten around to it yet, probably because I am not doing much turning these days.

-- Mike, an American living in Norway.

View poospleasures's profile


543 posts in 1906 days

#2 posted 11-03-2014 12:00 AM

Good looking chuck. Nice job and thanks for showing how to. Love the precision.

-- I,ve had amnesia for as long as I can remember. Vernon

View Mark's profile


814 posts in 1396 days

#3 posted 11-03-2014 12:27 AM

Very nice. I built a set of cole jaws, but they’re pretty much a pain in the butt to work with (not having a spare chuck). So I guess I’ll have to have a bash at one of those. Well done. Like yer shop too.

-- Mark

View ToddJB's profile


6787 posts in 1552 days

#4 posted 11-03-2014 05:49 PM

Great job. How do you center your piece in this? Also what are the holes for?

-- I came - I sawed - I over-built

View higtron's profile


207 posts in 2099 days

#5 posted 11-03-2014 07:40 PM

you cut two disks together when you mate them you flip one over so the arc’s are opposing each other when you move the disks away from each other or towards each other the holding point move in and out staying centered. Here is a video that will show the action of the chuck thanks for all the comments everyone it was a fun project.

-- A friend will help you move, a good friend will help you move a body

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