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Thread: Wobblers
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3rd November 2011, 09:03 PM #1
Wobblers
Wobbler 2.0 is a successor to Wobbler 1.0, which was a study sketch in Spruce, about 4 1/2" (115mm) in diameter and unfinished.
They're both loosely derived from David Springett's "Ribbon Streptohedron" in "Woodturning Full Circle," but with a circular cross section of each torus.
I call them "wobblers," because when rolled on a table top or the floor, they traverse an S-shaped path defined by cones tangent to a large and a small arc. There are four such cones available, but only two operate in a single rolling.
Wobbler 2.0 is 11" (280mm) in diameter, limited by my lathe's 12-inch swing, with allowance for cutting the outside and support for cutting the inside. The torus body has a diameter of 1 5/8" (41mm). The small rings are about 6 1/4" (160mm) in diameter.
There are 132 segments altogether, 66 each in Spruce and Mahogany. The large ring has 60 segments of 6 degrees; the two small rings have 36 segments of 10 degrees. I chose those values to make the outside width of the segments almost equal, for ambiguity in the exact location of the transition between large and small. The junctions lie at the corners of a hexagon.
The finish is clear semi-gloss polyurethane.
Cheers,
JoeOf course truth is stranger than fiction.
Fiction has to make sense. - Mark Twain
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3rd November 2011 09:03 PM # ADSGoogle Adsense Advertisement
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3rd November 2011, 09:30 PM #2
Joe I have the book one day maybe I'll get to attempt such as this
Well done
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7th November 2011, 02:23 PM #3GOLD MEMBER
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Joe,
WOW!
Not in this lifetime or the next will I attempt something like that.So much timber, so little time.
Paul
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7th November 2011, 02:35 PM #4Old Fart (my step daughters named me)
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OK I'll bite. Wobble wobble wobble. That is clever craftsmanship.
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7th November 2011, 09:44 PM #5
Thank you all. I think this is one of the weirdest things I've ever made - so far.
Cheers,
JoeOf course truth is stranger than fiction.
Fiction has to make sense. - Mark Twain
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8th November 2011, 08:23 AM #6
Great
regards
Nick
veni, vidi, tornavi
Without wood it's just ...
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31st July 2016, 03:15 PM #7
As almost everybody knows, pictures vanished from threads of this era.
However he found this thread, member SawTooth1953 requested pictures as shown in the tag line of post #1. The Forum sent me an email about the request.
I don't know what pictures were originally included, so I've reconstructed some from my files.
The second one is a stereo view. To see it in stereo, aim your eyesight at twice the distance to the screen, i.e."uncross" your eyes.
The first one illustrates the hexagon pattern of the arc junctions.
I hope this helps.
Cheers, JoeOf course truth is stranger than fiction.
Fiction has to make sense. - Mark Twain