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From ball to the star inside dodecahedron #1: First half

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Blog entry by Yuri posted 844 days ago 1789 reads 2 times favorited 6 comments Add to Favorites Watch
no previous part Part 1 of From ball to the star inside dodecahedron series Part 2: Making plugs »

I start this project without making proper calculation and drawing. I just made a quick sketch based on my previous ball project calculations. Sure enough, I had to redo first three holes and star vertices because the base of the star was suppose to be a nice small dodecahedron and it didn’t turn up the way I wanted. The base of the star should look good because star will be moving free inside and all cuts and mistakes will be quite noticeable. So, here are the pictures of the first 6 sides:


Ball has 12 marks where star vertices are going to be


Flat face


Going slowly inside at 20 degrees


Another view, about 10 mm done and 5 mm to go


Almost there


Done


Second tool bit to make a groove


In process


Thickness of the wall (depth to the opening) is 6.5 mm


Here it is, half done. I use shellac to finish each side/face/vertex before switching to the next hole.

I have no idea yet on how I’m gong to hold this thing in the lathe to do next 6 sides

-- Live to Learn



6 comments so far

View MShort's profile

MShort

1720 posts in 2004 days


#1 posted 844 days ago

Yuri— you are definitely in a whole nother dimension that I can keep up with… :) Love your creativity and boldness to try anything. I enjoy watching even thought it is much far beyond my capabilities. Hats off to you.

-- Mike, Missouri --- “A positive life can not happen with a negative mind.” ---

View kenn's profile

kenn

773 posts in 2305 days


#2 posted 844 days ago

Just amazing work, the only way I could think to hold it is to fill it with your wax/sawdust mixture. Good luck, it’ll look great.

-- Every cloud has a silver lining

View HalDougherty's profile

HalDougherty

1820 posts in 1823 days


#3 posted 843 days ago

Wow, that’s going to be way beyond my turning skills for a long time. Very impressive. I can see how filling the cavity to reinforce the center while turning the next 6 openings is important. A wax-sawdust mixture would be easy to get out, after all the cuts are finished. Good luck with this project. It’s going to be a fantastic display piece.

-- Hal, Tennessee http://www.first285.com

View stefang's profile

stefang

12416 posts in 1920 days


#4 posted 843 days ago

Great work Yuri. I love the looks of this ball! If you hadn’t already finished the outside I would have suggested gluing on wood with paper in between, and turn round again so your chuck can hold it. The glued on pieces can be easily removed with a chisel and light taps at the glue line. I realize this may be a bit more difficult than it sounds. I am sure with your technical abilities, you will find a good solution.

-- Mike, an American living in Norway.

View BritBoxmaker's profile

BritBoxmaker

4328 posts in 1622 days


#5 posted 843 days ago

That is seriously clever and interesting. I’m sure you’ll work out how to complete it.

Could I suggest some form of three jaw chuck with jaws opening outwards instead of closing inwards, inserted into one of the circular apertures.

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

View LittlePaw's profile

LittlePaw

1571 posts in 1664 days


#6 posted 805 days ago

It’s sort of like watching some university work while I’m struggling to get through grade school! It is fascinating just to watch and admire!

-- LittlePAW - The sweetest sound in my shop, next to Mozart, is what a hand plane makes slicing a ribbon.

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