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Thread: Un-Golf Ball
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22nd January 2012, 10:37 PM #1
Un-Golf Ball
This oversize Un-Golf Ball has bumps instead of dimples. Cherry, 2 3/4" (70mm) diameter; clear gloss polyurethane.
Golf balls typically have 330-500 dimples. A recent search of the US Patent Office database found 136 titles containing the words "golf" and "dimple(s)." Many different arrays are disclosed. My Un-Golf Ball has 482 bumps.
I laid out the pattern in pencil as subdivided spherical triangles in an icosahedral array. I erased the node intersections. I modified a drift punch with rounded end (~1/4" diameter), and used a 2-pound hammer to punch 162 dimples at the nodes, followed by 320 dimples at the centers of the small triangles.
I used a hand-held drum sander to reduce the outside to the bottom of the dimples; this also "erased" the layout lines. I sanded it further by hand to 600 grit. The only remaining evidence was variation in chatoyance.
Then I placed it in boiling water for a few minutes to raise the bumps, and let it dry. Google [ukibori] for more.
Cheers,
JoeOf course truth is stranger than fiction.
Fiction has to make sense. - Mark Twain
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22nd January 2012 10:37 PM # ADSGoogle Adsense Advertisement
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22nd January 2012, 11:40 PM #2
Nut! Fun and interesting though!
anne-maria.
Tea Lady
(White with none)
Follow my little workshop/gallery on facebook. things of clay and wood.
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23rd January 2012, 04:44 AM #3
Joe, quite interesting, and it amazes me, as seeing this for the first time.
Ukibori, is this not a carving technic invented by a Japanese person??
Ad
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23rd January 2012, 04:49 AM #4
Do the bumps help it fly any better than dimples?
Dragonfly
No-one suspects the dragonfly!
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23rd January 2012, 07:44 AM #5Skwair2rownd
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You have more patience and a steadier had than I do Joe!
Very clever an very well executed!
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23rd January 2012, 08:57 AM #6
Joe thats amazing
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23rd January 2012, 09:49 AM #7Always Learning
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Lot of thought gone into that well done
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23rd January 2012, 10:45 AM #8Senior Member
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Wow that is quite amazing. I would have tired long before getting a final result.
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23rd January 2012, 04:14 PM #9Old Fart (my step daughters named me)
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Patience is not mine to have. Rekon it would have ended like my golf shots do( In the scrub.) long before it was finished.
Very good exercise in whatever. Do admine your work tho.
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23rd January 2012, 04:53 PM #10
Joe you have way too much time on your hands
Still and interesting excersize, well done, your patience must be unlimited.Inspiration exists, but it has to find you working. — Pablo Picasso
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23rd January 2012, 09:44 PM #11
Yes, Ad, it's of Japanese origin. Tomiharu is cited as the expert.
Oddly enough, and unbeknownst to me until today, in the period of about 1890 to 1908, some golf balls had raised projections called "brambles." Thus called because they resembled wild fruit of the English countryside. Then recessed dimples were found to perform better.
Worked in small doses, it isn't very tedious, usually during television commercials. The clamp accessory was devised for another project, so it was already at hand. Somewhat squirrelly otherwise.
I found that a piece of carpet, without any cushion, provides the best support on the far side. On a hard surface, the far side might get flattened; with cushion, the initial dimples aren't deep enough.
In case it isn't obvious, the reason for erasure is to avoid marks on the final product. It also helps to wash hands frequently.
Cheers,
JoeOf course truth is stranger than fiction.
Fiction has to make sense. - Mark Twain
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23rd January 2012, 10:58 PM #12
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24th January 2012, 09:07 AM #13
Cool!
Hmmm... I wonder how effective this process'd be in making "non-slip" tool handles?
- Andy Mc
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24th January 2012, 10:10 AM #14SENIOR MEMBER
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Now you've got me thinking. When I was teaching Plastics in the 70's, we used to squash a key or coin into hot acrylic, let it cool, sand the surface flat, polish it and then reheat it to allow the "indentation" to rise. Of course, the old method of steaming dents from wood means that the same technique would apply. I may be rehashing something many of you already do, but the idea of using it to produce raised sections on tool handles sounds good.
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24th January 2012, 03:44 PM #15Been here a while
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The bumps are essentially raised bruises, where the fibers have been deformed by stretching then restored. They are softer than the surrounding timber and easily worn away, so not ideal for long-term use in tool handles.
It's easy to try this yourself - hit a hammer into a bit of wood, then steam it out again. You'll find the bruised area will never be as hard as it once was.
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