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Author Topic: ??? about leverage drilling  (Read 1766 times)

Re-Evolution

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??? about leverage drilling
« on: February 15, 2004, 07:16:07 AM »
I have been thinking about the dynamics of drill patterns and I think that this makes more sense than the normal method for a leverage drill.

They say that a leverage drilling is with the pin 3 3/8" from PAP.
well this doesn't make any sense to me because you can have the pin 3 3/8 from PAP in many different positions as you move the pin in an arc up and down.
This 3 3/8 pin location is only accurate if you placed the pin on the line that goes from your PAP through grip center to your track.
With this being correct couldn't you place the pin anywhere within reason on a line that is 3 3/8" from PAP and runs parallel to your track therefore the pin would always be exactly in the middle between you track and PAP.
By making this line that runs parallel to your track and placing the pin on it you could get the most out of the core and adjust when it reacts with the vertical placement.
The reason that I started wondering this is because I recently had a ball drilled that is 3 3/8" pin but since the pin is quit high it ends up being quit close to my VAL and the ball flares very little with an early roll and I have a ball that is drilled with the pin roughly 5" from PAP but is close to the line that is 3 3/8" from PAP and running parallel to my track and I get quit a bit of flare out of this drilling even though it has a differential of .041 and the ball with little flare has a diff of .058

As I was typing this I realized that the line wouldn't run exactly parallel to your track but would actually get slightly farther from you track as it went up to stay in the middle of your track and PAP. For instance say your track runs at a 15° angle to your bridge line you would make this line at a 7.5° angle.

Do you think that this makes more sense than the current "leverage" drilling.
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STORMIN1



Edited on 2/15/2004 11:24 PM
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Re-Evolution

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Re: ??? about leverage drilling
« Reply #1 on: February 17, 2004, 05:46:35 PM »
quote:
Just a question: In both balls, where is the CG 1) In reference to your PAP 2) in reference to your grip center. 3) In reference to each other.

Also, is there a weight hole in either or both balls and where is it in reference to your PAP?

Michael Cimba
www.bowlbetternow.com

Edited on 2/17/2004 3:04 PM


On the ball with more flare (.041 diff): the CG is 4 1/2" from PAP, 6:00 to pin, and in grip center with no weight hole. 3/4oz pos. side, no finger or thumb weight

On the ball with less flare (.058 diff): CG is 3" from PAP, 5:00 to pin, about 3/8" above grip center, weight hole is about 3/4" above PAP and 1/2" past VAL. 3/4oz pos. side, 1/4oz finger.

Distances are approximate.
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STORMIN1

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Re-Evolution

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Re: ??? about leverage drilling
« Reply #2 on: February 19, 2004, 05:20:56 PM »
I know RG is a factor if ball reaction, but RG does not affect the ammount of flare a ball has, it only has an affect on when it wants to go into a roll.
High RG = late roll / Low RG = early roll.
The amount of flare a ball has is dependent on Differential.
At least that is what every bit of info I have ever found states.
I never said anything about the balls reacting differently just that the ball with little flare should have more going buy specs and drill pattern.
I expect them to react differently considering 1 is a pearl and the other is a particle.


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STORMIN1



Edited on 2/19/2004 6:19 PM
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