Turning a ball is more work than you think.
I first tried a simple method..
Turn a blank round
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Form the ball
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Part off and sand.
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Clearly, not a ball...
On to step two!
Chuck up a chunk of walnut, and scrape out a cup...
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Part off for the tailstock....
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Scrape out an matched set for the chuck side..
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They should match up.
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Insert square block..
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Okay. You turn off the edges, rotate your block. Turn off more edges, rotate your block.
Etc. About 15-20 minutes later...
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You can see how I turned a way the jam chuck as I went. The closer you get to spherical, the less you remove each rotation. Like anything practice till you're happy with it!
I first tried a simple method..
Turn a blank round

Form the ball

Part off and sand.

Clearly, not a ball...
On to step two!
Chuck up a chunk of walnut, and scrape out a cup...

Part off for the tailstock....
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Scrape out an matched set for the chuck side..
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They should match up.
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Insert square block..
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Okay. You turn off the edges, rotate your block. Turn off more edges, rotate your block.
Etc. About 15-20 minutes later...
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You can see how I turned a way the jam chuck as I went. The closer you get to spherical, the less you remove each rotation. Like anything practice till you're happy with it!
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