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Author Topic: When is a ball "asymetrical"?  (Read 964 times)

DanH78

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When is a ball "asymetrical"?
« on: May 14, 2004, 10:57:43 PM »
Thinking back to geometry class, the basic definition is if you were to cut an object in half, it would be in two equal portions.  Now, a lot of "symetrical" bowling balls, I don't think they fit the definition.  Take Dynothane for instance, the Element core has symetry through the vertical axis, but not through the horizontal.  The Thunder cores from Storm, same thing.  Retro Resurrection, etc.  I could keep listing them but you get the idea.

The closest thing I can think of to a truly symetrical core are the Diamond cores, and the stinger cores from Ebonite.  

Does the term actually refer to "spin time" and mass bias ratings?  

I don't get it.
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LuckyLefty

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Re: When is a ball "asymetrical"?
« Reply #1 on: May 15, 2004, 02:08:46 PM »
You in a way have answered the question yourself.

Most balls are listed as symmetrical if they are symmetrical around a vertical line thru the center of the core.

Many balls are not symmetrical from top to bottom or in other words around a line horizontal thru the center of the core.  Yet the core IS symmetrical by the way today's definition is used.

Symmetrical = symmetrical around a vertical line thru center of the core.
No horizontal protrusions!  Assymetrical = horizontal protrusions.

IE a woman would would not be consided symmetrical for these purposes!  Thank GOD!

REgards,

Luckylefty
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tenpinspro

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Re: When is a ball "asymetrical"?
« Reply #2 on: May 15, 2004, 02:27:10 PM »
One more way guys,

Storm introduced the multi density core in the El Nino.  It had a symmetrical shape yet was considered to have an asymmetrical reaction.  They made one side of the block heavier then the other.  By ceating the multi density core, there were no horizontal protrusions as we normally see.

ps. cool example LL

Rick
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DanH78

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Re: When is a ball "asymetrical"?
« Reply #3 on: May 15, 2004, 03:13:55 PM »
But the X-factor core is symetrical through 2 vertical planes.  The throttle cores look symetrical through the horizontal and the vertical.

<scratches head>
 
I do get what your saying, but there seems to be some inconsistency in industry definitions.
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DanH78

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Re: When is a ball "asymetrical"?
« Reply #4 on: May 15, 2004, 03:47:25 PM »
quote:
dan,

the xfactors use different densities in their shape to create a secondary differential.

throttles are radially symmetrical.
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I understand what you mean with the Xfactor, but what do you mean by "radially symmetrical"?
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C-G ProShop-Carl

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Re: When is a ball "asymetrical"?
« Reply #5 on: May 15, 2004, 03:48:27 PM »
I believe if I remember correctly, the disc in the center of the core for the X Factors is what made them asymmetrical.

Throttle core is symmetrical.
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Edited on 5/15/2004 3:52 PM
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DanH78

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Re: When is a ball "asymetrical"?
« Reply #6 on: May 15, 2004, 05:39:03 PM »
Thanks for the replies.  I think I now understand how they determine when a ball is asymetrical.  I know I at least have a better understanding than an average bowler really needs.
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a_ak57

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Re: When is a ball "asymetrical"?
« Reply #7 on: May 15, 2004, 05:42:50 PM »
Hmm, interesting, I've been curious myself, well, know i know.

And Dan, most bowlers don't even know what a "pin" is...so...
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BadShot

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Re: When is a ball "asymetrical"?
« Reply #8 on: May 15, 2004, 06:22:04 PM »
i believe that we would be correct in saying that an assymetrical ball is a ball with a mass bias . . . when the mass of the core itself is shifted to one side, causing an imbalance in the core along its vertical axis.

some cores may therefore be assymetrical, even though they appear to be symetric, due to differences in the densities of one side of a core compared to the other side.

i'm not positive, but i seem to remember a good explanation of this topic on mo pinel's website (morich equipment).

danh78, that's a good observation about the diamond cores being symmetric along ANY axis . . . i can't think of another high performance ball that meets this requirement.
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