LumberJocks

Turning dodecahedrons inside the sphere #2: Third Chuck

  • Advertise with us
Blog entry by Yuri posted 897 days ago 3460 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.

Yuri

-- Live to Learn



4 comments so far

View stefang's profile

stefang

12580 posts in 1933 days


#1 posted 897 days ago

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

mafe

9456 posts in 1688 days


#2 posted 897 days ago

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

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

View BritBoxmaker's profile (online now)

BritBoxmaker

4338 posts in 1635 days


#3 posted 896 days ago

Precise and accurate.

-- Martyn -- Boxologist, Pattern Juggler and Candyman of the visually challenging. http://www.theartofboxes.com

View SASmith               's profile

SASmith

1546 posts in 1586 days


#4 posted 896 days ago

Very clever.

-- Scott Smith, Southern Illinois

Have your say...

You must be signed in to post the comments.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com

Latest Projects | Latest Blog Entries | Latest Forum Topics

GardenTenders.com :: gardening showcase