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Longworth chuck with jaws

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Forum topic by nick85 posted 04-01-2012 11:47 PM 5228 views 0 times favorited 6 replies Add to Favorites Watch
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nick85

39 posts in 1706 days


04-01-2012 11:47 PM

HI guys. I just recently pulled an old lathe out of my dad’s shed that was gathering dust and dirt dobber nests, and decided to try my hand at woodturning. It didn’t have a faceplate or chuck to hold items, so I made a 6-peg Longworth chuck. Then I thought of this secondary faceplate with straight slots and jaws, rather than rubber pegs. The jaws use a threaded rod and wingnut for tightening at the center end of each jaw, and a short dowel that keeps the jaw straight on the outside end.

I couldn’t find anything like it online, but was wondering if anyone out the had come up with something similar, and if so, how well does it work? This is just a quick design on the computer, before building it today. I assume it works on the same principle as a store bought chuck, but I can’t afford one of those right now… =S

(apologies for the size, only on 2nd cup of coffee)

-- "I suggest a new strategy, R2: let the Wookiee win."


6 replies so far

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Dusty56

11806 posts in 3147 days


#1 posted 04-02-2012 12:53 AM

looks cool . how will you attach it to your lathe ?

-- I'm absolutely positive that I couldn't be more uncertain!

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nick85

39 posts in 1706 days


#2 posted 04-02-2012 01:02 AM

Thanks! My lathe is an old Craftsman with 3/4”-16 threads. I’ve ordered some 5/8” bore flanges from Grainger that I will tap out and attach to the backplate of the chuck. Basically this design is just another frontplate and jaws, so I can quickly switch between the 6 rubber stoppers and the 3 jaws. I’m just a little hesitant on their holding power… =S

I’d like to get a nice metal chuck, but finding them for my machine is tricky without an adapter, and pricier than I’m willing to go at the moment… If I find that I really like woodturning, I may upgrade to a better lathe.

-- "I suggest a new strategy, R2: let the Wookiee win."

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Dusty56

11806 posts in 3147 days


#3 posted 04-02-2012 09:33 PM

Turning is fun if your tools are sharp ! Something I must get done very soon : ) Enjoy !!

-- I'm absolutely positive that I couldn't be more uncertain!

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nick85

39 posts in 1706 days


#4 posted 04-02-2012 10:49 PM

Yeah, I learned that lesson making a bowl from black palm. Dull cutter caught and blew the piece of wood in half… Conveniently, the motor I’m using to power the lathe is a heavy duty bench grinder, so I can quickly mount a grinding wheel and use the lathe tool rest to get straight edges on my gouges… (After removing the belt from the other side, of course)

-- "I suggest a new strategy, R2: let the Wookiee win."

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hairy

2384 posts in 2991 days


#5 posted 04-02-2012 11:02 PM

I think a faceplate might work better for you.

http://www.davidreedsmith.com/Articles/WoodenFaceplate/NutFaceplate.pdf

A longworth chuck is used to clean up the bottom of a bowl, where it was held in a chuck, and similar operations that need slow speed and light cuts.

-- stay thirsty my friends...

View Jim Jakosh's profile

Jim Jakosh

17105 posts in 2565 days


#6 posted 06-20-2012 12:18 PM

That is pretty cool. I’m making a Longworth chuck and I’m looking for the material/ stoppers etc for the jaws.
Are your 3 jaws tapered at all to hold a downward force on the piece?...........Jim

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

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