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Author Topic: Weight Hole  (Read 2854 times)

bshannon

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Weight Hole
« on: March 02, 2009, 08:01:15 PM »
I have an old ball (10-15 years old) that I used to really like the reaction. I tool it in for new grips and a surface clean up, the shop pro told me that the ball is now illegal due to the size of the weight hole 1-3/8". I have several questions.
 * Is the ball grandfathered in due to it's legality when it was drilled?
 * The layout is 4 X 0 with 1/2oz side & 1/2oz finger with said large hole on my PAP. Do I look for balls with specific top weight in order to duplicate this layout on a new ball?
  * Does this layout work better on symmetrical or asymmetrical core?
  * This was a popular layout in the urethane days, why has it lost it favor?

Thanks in advance for your input
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Moon57

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Re: Weight Hole
« Reply #1 on: March 03, 2009, 05:08:16 AM »
If you really like this ball have the proshop plug the weight hole and drill a legal hole in the same spot only a little deeper. If you don't use this ball in sanctioned play it doesn't matter.
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Moon
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So many questions, so little time but I'm having fun.
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charlest

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Re: Weight Hole
« Reply #2 on: March 03, 2009, 06:48:11 AM »
quote:
I have an old ball (10-15 years old) that I used to really like the reaction. I tool it in for new grips and a surface clean up, the shop pro told me that the ball is now illegal due to the size of the weight hole 1-3/8". I have several questions.
 * Is the ball grandfathered in due to it's legality when it was drilled?


Not sure on that one. Probably not.

quote:

 * The layout is 4 X 0 with 1/2oz side & 1/2oz finger with said large hole on my PAP. Do I look for balls with specific top weight in order to duplicate this layout on a new ball?


You don't say what type of core this ball has. If it's an older pancake core, then the static weights will have a significant effect. I suspect it's a dynamic core, otherwise you wouldn't be mentioning the pin position, the "4" in the "4x0". That said, the 1/2 side, 1/2 finger make virtually no difference in the ball's reaction. The "4x0" (plus the pin's height above the midline) are the only important factors.

Have the driller plug the hole and make it the max legal size, 1 1/4" and drill it the depth needed to make it legal. You can have it taken it to 1/2 and 1/2, if it makes you happy. It just makes little true difference.

quote:

  * Does this layout work better on symmetrical or asymmetrical core?


The "4x0" indicates the pin and CG distances with respect to the PAP. If, on an asymmetric core, you put the CG on the PAP/VAL, the MB, mass bias will be well past the VAL. This is usually, but not always, not recommended, especially on a strong mass bias.

When talking about drilling Asymemtric cored balls, nomention of the CG is made because it is of no importance. The pin and the MB are the only important item to be placed.

On an asymmetric core, the equivalent drilling is the MB located on the VAL. The position of the MB on an asymmetric ball has a much greater effect on the ball reaction than the position of the CG on a symmetric cored ball on the PAP. The Asymmetric ball will roll very early. The stronger the MB, the earlier it will try to get into a roll.

quote:

  * This was a popular layout in the urethane days, why has it lost it favor?

With short oil, in the last of the urethane days, I don't recall this drilling being very popular at all. Maybe you had a lot of oil in your neck of the woods. This drilling tends to make a ball roll really early, but cut down on the backend. If you had high ball speed and low rev rate, I can see it being used. In any case, there are many drillings that will make balls roll early and there are now so many balls that do so many things, this type of drilling is just not seen a lot. It is still used, however. In fact, I was thinking of using it myself just this morning on a pearl to make it more usable playing an outside line with less flip and less backend. What goes around, comes around.[/quote]

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

Edited on 3/3/2009 7:50 AM
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"None are so blind as those who will not see."

tenpinspro

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Re: Weight Hole
« Reply #3 on: March 03, 2009, 01:09:27 PM »
Hey bshannon,

The 4x0 came recommended in Columbia drill sheets if I remember correctly.  I had a Rage and Outrage drilled like this (symmetrical cores).  The only thing similar to urethane when we did this was called a label axis drill where the weight hole went back thru cg and pin (blk hammers usually).  It was originally used more for crankers (high speed and revs) to smoothen out their reaction on the short oil.

Lower top weight will make it easier to remove pos side weight to meet USBC guidelines.

I do recommend however if you plug and redrill this hole to go below 1 1/4 because ABC/USBC Nationals flagged 2 of my balls 2-3 yrs ago with an 1 1/4 weight hole because I had buzzed the edges to avoid the possibility of cracking.  

They had 3 guys discussing this for a little while, tried to tell them that the hole diameter was 1 1/4 inside but they decided (in their wisdom) that the lite buzzing on the edge caused the hole to now be larger than 1 1/4 and they were sent to the booth to be fixed.

 
quote:
In fact, I was thinking of using it myself just this morning on a pearl to make it more usable playing an outside line with less flip and less backend.
 


Haha....so was I charlest....funny.
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Rick Leong - Ten Pins Pro Shop
Co-Founder - Tag Team Coaching
"El" Presidente of the Legion

JessN16

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Re: Weight Hole
« Reply #4 on: March 03, 2009, 01:15:03 PM »
I have this exact drill pattern on a Track Threat that came with low top weight. Talk about a ball that's very smooth but still has some drive to it, this one does. It's one of the balls I keep handy when I know I'm going to see dry track areas and want to play right of the track rather than move left. And when that condition is there, this ball is a killer.

Jess
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kidlost2000

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Re: Weight Hole
« Reply #5 on: March 03, 2009, 01:27:47 PM »
"They had 3 guys discussing this for a little while, tried to tell them that the hole diameter was 1 1/4 inside but they decided (in their wisdom) that the lite buzzing on the edge caused the hole to now be larger than 1 1/4 and they were sent to the booth to be fixed."

It's stupid stuff like that, that can hurt any sport. A 1 1/4" hole that has a bevel to smooth the edges is still a 1 1/4" hole. But USBC list it as

(2. One hole for balance purposes not to exceed 1-1/4"
inch diameter. (Including the surface opening).)

So why not say 1 1/8" and bevel it to whatever. Or leave it unbeveled and let it damage the equipment.

Stupid rules are made by stupid people who have no sense. Which is what the USBC has been founded on.

The new slogan for USBC should be " we're not happy, till you'r not happy "
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Edited on 3/3/2009 2:28 PM
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…… you can't  add a physics term to a bowling term and expect it to mean something.
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