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Author Topic: Asymmetric vs Symmetric cores: plugging and redrilling?  (Read 3450 times)

charlest

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Asymmetric vs Symmetric cores: plugging and redrilling?
« on: September 26, 2009, 11:39:07 AM »
I SEEM to feel that plugging and re-drilling asymmetric cored balls are more prone to affecting the core''s dynamics than plugging & redrilling symmetric cored balls, but I do not know if it''s based on some logical but subconscious reason.

In other words, If you plug and re-drill an asymmetric/mass bias ball, do you run a greater risk of NOT having a good amount of the stock dynamics than you would with a symmetric cored ball?

This bothers me because I have no reason, based in physics (or Core Dynamics) for this assumption or feeling. It seems to me that it''s easier to destroy or have a greater affect on the dynamics of a mass bias ball than a symmetric cored ball.

Does anyone know of any physical reason for this to be true or false??
Or it it just luck or happenstance?

I wonder. I do not know. I''d like to know.

I''m not asking for your personal experience in redrilling mass bias balls. I have mine. We all have some. All the experience in the world does not really constitute proof, or a valid reason.

Thanks.
On edit: as Rico so appropriately put it, I should have phrased this: mass bias vs non-mass bias balls because there are symmetric mass bias balls and there are asymmetric non-mass bias balls.
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Edited on 9/26/2009 8:38 PM
"None are so blind as those who will not see."

 

JustRico

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Re: Asymmetric vs Symmetric cores: plugging and redrilling?
« Reply #1 on: September 26, 2009, 07:47:59 PM »
My view on this would be the how the asymmetry is created in the core and where the holes are placed, as well as depth of holes.
If the asymmetry is created by using multi-densities, then I can see see the dynamics possibly being effected, by altering the densities and shifting the masses.
Same would be in relationship to the gripping holes.
A test would be to take a plugged asymmetrical core ball and spin on a determinator to see if the mass bias has moved. You could also test different manufacturers asymmetrical core balls to see how the different types are effected.
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scotts33

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Re: Asymmetric vs Symmetric cores: plugging and redrilling?
« Reply #2 on: September 26, 2009, 08:22:43 PM »
My opinion is not scientifically based but I will say that I bought a used T S&A from a person whose PAP was supposedly close to mine. I did know that a target X-hole was drilled into it but did not know that it was so deep.  A 1" hole drilled at least 2" deep was plugged and that ball always rolled like crap. After trying multiple surfaces and every hand position that I possess I gave up on it. I'd agree Jeff though I can't base my opinion on science.
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JustRico

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Re: Asymmetric vs Symmetric cores: plugging and redrilling?
« Reply #3 on: September 26, 2009, 08:40:13 PM »
A weighthole 2" deep is not considered deep, it more than likely did not hit the core.
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Formerly BrunsRico
Co-author of BowlTec's END GAMES ~ A Bowler's COMPLETE Guide to Bowling; Head Games ~ the MENTAL approach to bowling (and sports) & (r)eVolve
...where knowledge creates striking results...
BowlTEc on facebook...www.iBowlTec.com

charlest

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Re: Asymmetric vs Symmetric cores: plugging and redrilling?
« Reply #4 on: September 26, 2009, 08:43:04 PM »
quote:
My view on this would be the how the asymmetry is created in the core and where the holes are placed, as well as depth of holes.
If the asymmetry is created by using multi-densities, then I can see see the dynamics possibly being effected, by altering the densities and shifting the masses.
Same would be in relationship to the gripping holes.
A test would be to take a plugged asymmetrical core ball and spin on a determinator to see if the mass bias has moved. You could also test different manufacturers asymmetrical core balls to see how the different types are effected.
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Formerly BrunsRico


Thank you, Rico.
Those various densities asymmetric cores are a twist I didn't have in mind, making a complex concept even more complex.
My pro shop doesn't have a determinator. But there's another good shop I can ask.

Such a fascinating topic ...

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"None are so blind as those who will not see."
"None are so blind as those who will not see."

scotts33

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Re: Asymmetric vs Symmetric cores: plugging and redrilling?
« Reply #5 on: September 26, 2009, 08:46:14 PM »
quote:
at least 2" deep  


Since, I don't have the ball Ric I know it was deeper and did hit the core so that was minimum guess.  I remember my driller said that it was deep into the core....he wondered at the time how it would roll.
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charlest

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Re: Asymmetric vs Symmetric cores: plugging and redrilling?
« Reply #6 on: September 26, 2009, 08:47:41 PM »
Scott,

Agree with Rico. 2" hole affects static weights more than dynamics, in general.

I went thru h*ll in a hand basket with a couple of new Shock & Awes, never  getting either to work, EVEN when one was drilled by the great Mo himself.

Have had much better recent success when I got a better handle on Mass Bias influences with respect to bowler release specs and a bunch of current Mass Bias balls, mostly Brunswick & 900Global.

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"None are so blind as those who will not see."
"None are so blind as those who will not see."

scotts33

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Re: Asymmetric vs Symmetric cores: plugging and redrilling?
« Reply #7 on: September 26, 2009, 08:59:45 PM »
Sidebar....related to this.  Ric can you comment or have any knowledge of pro's using the Wild Ride and using Turbo's SwitchGrip having issues or problems with the way the ball rolled when using the Turbo SwitchGrip?

Reason I ask in that in the Wild Thing Big B video by Billy O.  Billy says the Paragon core was used in the Wild Thing to raise the Rg differential so that interchangeable thumbs can be used.
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Scott

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JustRico

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Re: Asymmetric vs Symmetric cores: plugging and redrilling?
« Reply #8 on: September 26, 2009, 09:12:26 PM »
In using any of the interchangeable thumb inserts, generally, you are going to lower the RG and raise the differential.
Most thumb holes are drilled 4 1/2-6+" away from the pin creating asymmetry in the ball (weight holes placed 6 3/4" from the pin in symmetrical core balls create the strongest asymmetry) thus having the highest potential to alter the core dynamics.
So in most instances, you are lower the RG and increasing the diff.
--------------------
Formerly BrunsRico
Co-author of BowlTec's END GAMES ~ A Bowler's COMPLETE Guide to Bowling; Head Games ~ the MENTAL approach to bowling (and sports) & (r)eVolve
...where knowledge creates striking results...
BowlTEc on facebook...www.iBowlTec.com