Turning dodecahedrons inside the sphere #2: Third Chuck

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Blog entry by Yuri posted 02-10-2012 02:41 AM 8245 reads 1 time favorited 4 comments Add to Favorites Watch
« Part 1: First ball Part 2 of Turning dodecahedrons inside the sphere series no next part

First chuck (see my previous blog) I upgraded from two screws to three T-Bolts.

Still gives me a lot of positioning flexibility from the front where I can check the center and from the sides. Later I realized, any jigs like this should not be removed from the face plate. Re centering A to B takes very, very , very long time

T-Bolts from the face plate view.

More stable Sphere Chuck #3 design. Biggest advantage of this chuck is speed of centering and locking the ball in.

Started with two peaces from the home hardware store. I’m not exactly sure what they for but they have right size and can be screwed in. Reminder: Mark the peace when you first time put in the lathe. In my case, my lathe chuck has letters, so I always align my A-A.

Cut them a bit to make them smaller.

Two other peaces made from four layers of fiberglass and epoxy.

On two waxed half-balls I spread vaseline then cover with fiberglass cloth, spread epoxy then cloth then epoxy and so on to create 4-5 layers. To create ridges marked on last two pictures with blue arrows I had black pipe cut-off placed on the top (make sure vaseline is on all parts that don’t need to be glued-in, including the half-balls footprint!). Takes 24 hours to cure and a bit of fighting to separate half-balls from fiberglass. Here is the result:

No gaps, perfect fit

With a few layers of the same fiberglass cloth I glued peace of aluminum to screw in center bolt.

To the center bolt I can screw in wooden plugs/pegs if needed. I will get to that on the next blog when I finish this ball

Also check Stefang's blog on how to make the chuck from wood.


-- Live to Learn

4 comments so far

View stefang's profile


16381 posts in 3602 days

#1 posted 02-10-2012 10:21 AM

This looks real good Yuri. Clever thinking about making the fiberglass insert and also the way you secured the threaded insert for the center bolt.

I considered using a donut chuck like your first one after my first chuck failed, but I never got around to it and now I have my new chuck.

I’m enjoying your blog very much and you have a lot of good ideas. I hope my Chinese ball will come out as good as your dodecahedrons did.

-- Mike, an American living in Norway.

View mafe's profile


11779 posts in 3357 days

#2 posted 02-10-2012 10:39 AM

Really a true inventor!
I love your thinking, clever and with sence for the detail.
Best thoughts,

-- MAD F, the fanatical rhykenologist and vintage architect. Democraticwoodworking.

View BritBoxmaker's profile


4611 posts in 3304 days

#3 posted 02-10-2012 04:14 PM

Precise and accurate.

-- Martyn -- Boxologist, Pattern Juggler and Candyman of the visually challenging.

View SASmith               's profile


1850 posts in 3255 days

#4 posted 02-10-2012 05:41 PM

Very clever.

-- Scott Smith, Southern Illinois

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