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post #1 of 12 Old 01-19-2013, 04:24 PM Thread Starter
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Spheres

Here are my first attempts at spheres.
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post #2 of 12 Old 01-19-2013, 04:30 PM
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Pretty good! I like the distressed-looking one.
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post #3 of 12 Old 01-19-2013, 04:51 PM
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Still haven't dreamed if attempting a sphere. Those look nice.

That bowl was perfect right up until that last cut...
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post #4 of 12 Old 01-19-2013, 06:18 PM
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They look pretty darn round to me. That's not easy at all. Nice work.
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post #5 of 12 Old 01-19-2013, 07:41 PM
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Awsome!
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post #6 of 12 Old 01-19-2013, 08:11 PM
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those are round
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post #7 of 12 Old 01-19-2013, 09:18 PM
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Excellent job. I designed a project using a sphere. I will have to search for the wood of the right size so I did a test of something similar with smaller wood. The final project will be larger and more ornate. This one is about 18" tall with a 3" mirror in it.
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post #8 of 12 Old 01-19-2013, 10:33 PM Thread Starter
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Thanks for the replies. Nic job John. I'm a long ways from doing that kind of stuff.

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post #9 of 12 Old 01-19-2013, 10:44 PM
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Quote:
Originally Posted by sawdustfactory View Post
Still haven't dreamed if attempting a sphere. Those look nice.
+1

Sometimes I'm lucky to get round. Spherical seems insanely difficult without some kind of jig. Even with one, I bet I'd find a way to mess it up.
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post #10 of 12 Old 01-20-2013, 08:06 AM
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There are some good videos on youtube that show turning sphere's. I have collected photos of a bunch of different sphere turning jigs and will eventually build one. I'm going to build a nice one out of metal but they can be built quite easily out of wood.
the method I use is to first turn a cylinder. The cut the width to match the diameter of the cylinder. Then turn it close to round and draw a line on the center. Cut the tenons off and mount it between 2 cones so the line you drew runs through the center of the cones. Then just carefully turn away the shadow area so it's round. Draw another line and mount it so neither line runs through the cones. Turn the shadow away. In theory you should now have a round sphere.
What I find usually goes wrong is the cones that you use as a jam chuck may not be accurate enough or are too large or too small to properly support the area you just turned. You can usually tell this because the shadow area will extend all the way to the cones. This usually happens on the first rotation anyway but after the first one the shadow area should ideally be smaller and smaller and more toward the center. My first spheres started out one size and ended up about 1/2" smaller or more. Now I usually end up taking off just an 1/8 or 1/4"
Hope this helps someone. They are fun to turn.
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post #11 of 12 Old 01-20-2013, 10:50 AM
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I'm not sure how you made the made the hole for the mirror but I just stumbled on this jig and thought it was a good idea to pass along.

Ball drilling jig

Keep in mind that I'm new to turning but I would think that the cones would like holes in your sphere and I don't see any in your pics.

Off the top of my head seems like you would want to turn two bowl sort of mounts, one mounted on the head and the other on the tail stock. Turn round then rotate until your satisfied.

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post #12 of 12 Old 01-20-2013, 08:02 PM
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Well I turned the opening. You can do that with a jig similar to the drilling jig. We call it a Doughnut chuck. I did it using a vacuum chuck.
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