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Author Topic: Difference between two drills  (Read 1942 times)

lefty50

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Difference between two drills
« on: April 06, 2010, 09:56:17 AM »
In general terms, what would be the difference between the following drillings:

LEFT HANDED...
PAP = 4-3/4 by 3/4 up, although this is a generic question, so it may not matter....

A. - Pin next to ring, Cg straight under (3 inch pin)
B. - Pin just below ring, Cg swung left 45 degrees.

Thanks in advance.



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J_w73

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Re: Difference between two drills
« Reply #1 on: April 06, 2010, 07:00:07 PM »
In a symmetrical ball they are probably going to be pretty close to the same.
More than likely the one with the cg kicked out 45 degs is going to need a weighthole and where you put the weighthole will influence the reaction alot.

Pin next to the ring is going to flare alittle more
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18 mph,350 rpm,PAP 5 1/2 x 3/8up, 15 deg axis tilt, varied rotational axis deg.. usually 45+
HighGame 300 x 4, High Series 808
Book Average 205,PBA Xperience 185
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kidlost2000

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Re: Difference between two drills
« Reply #2 on: April 06, 2010, 07:16:01 PM »
Pin placement is one huge factor in ball reaction. In my personal experience being that close has not been a huge difference. Usually falls within 1/2" of same distance from pap for either drilling.

The cg location and need for a weight hole can make a lot of difference like the guy ahead of me said.

Weight holes can be added in locations to increase flare, decrease flare, give more length in one location, less length in another.

If you drilled two of ball brand X and tried the two different pin locations and left the cg in the palm area both would be very similar.

The X factor will be the weight hole location and size.
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lefty50

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Re: Difference between two drills
« Reply #3 on: April 07, 2010, 12:03:18 AM »
Ok thanks. Follow-up question... I want to make this a flare increasing drill. I've heard  that the best flare increasing option is something like 2-1/4 down on the VAL. True? Also, what's rthe effect of going past the VAL and/or further down towards the thumb?
Thanks!
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kidlost2000

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Re: Difference between two drills
« Reply #4 on: April 07, 2010, 12:19:05 AM »
I would go to Morichs website where it shows a diagram for x-hole locations. I have also read that 2 1/4 past your PAP increases flare.


P4


http://www.morichbowling.com/Drilling/GradientLineBalanceHole/GradientLineBalanceHole.htm


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J_w73

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Re: Difference between two drills
« Reply #5 on: April 07, 2010, 12:20:07 AM »
quote:
Ok thanks. Follow-up question... I want to make this a flare increasing drill. I''ve heard  that the best flare increasing option is something like 2-1/4 down on the VAL. True? Also, what''s rthe effect of going past the VAL and/or further down towards the thumb?
Thanks!
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It depends who you ask.. Take a look at the morich gradient line method..that could give you an idea..

http://www.morichbowling.com/Drilling/GradientLineBalanceHole/GradientLineBalanceHole.htm

I believe that if you want to increase flare the optimum place is 6 3/4 from the pin.. the placement of the hole in relation to the PAP will alter the reaction of the ball though... For a symmetrical ball, if the hole is 6 3/4 from the pin, where you put the hole will act as a mini PSA/MB spot..
so you can place the hole like you would a PSA/MB to get the desired reaction..

as far as 2 1/4 down the VAL.. well most generic drillings are or were somewhere around leverage( pin to pap of 3 3/8" - 4") Well that distance plus your 2 1/4 is getting pretty close to 6 3/4" from the pin  and into the side of the core.  The ebonite link below explains that any hole over 5" from the PIN will more than likely increase the flare.

this link from ebonite gives some good info about balance holes..

http://ebonite.com/resources/bowling_tip_detail/balance_holes

I feel the "truth" about balance holes is a combo between Morich''s and Ebonite''s theory..  I think Ebonite is on with the distance from the pin being a determining factor.. and Mo is correct about the position of the hole being a factor..

This is just me pulling all my knowledge together and making my own little theory. I''m sure some will disagree with what I am saying.

I am still searching for the real "truth" about balance holes..

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18 mph,350 rpm,PAP 5 1/2 x 3/8up, 15 deg axis tilt, varied rotational axis deg.. usually 45+
HighGame 300 x 4, High Series 808
Book Average 205,PBA Xperience 185


Edited on 4/7/2010 0:21 AM
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