Author Topic: cg nomaddah??? (Read 3213 times)

BrunsWolf · « **on:** March 22, 2007, 06:11:07 AM »

while brunswick teaches that the placement of the cg doesn't affect ball reaction, why is it still taught in the laying out a ball according to degrees (BTM, here, etc.). yes, i know the degree method works on assym. balls with the MB being measured. i'm talking about the cg on sym. balls. so.......

Do the angles of the PAP,Pin,CG matter?
Why is it still taught?

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Grayson · « **Reply #1 on:** March 22, 2007, 02:18:30 PM »

I guess with the CG on symm cares the position of the MB is defined and that imho is more important and what I have read the drilling always refers to the MB for assymetrical balls.

I guess it has to make a difference or between a label and a cg out drilling if the pin is put in the same location!....
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purduepaul · « **Reply #2 on:** March 22, 2007, 03:15:25 PM »

Grayson is correct, when you spin a symmetrical ball, the ball will go to the high RG spot still, but since the high RG spot is across the equator of the ball it will spin if you give it enough time throughout the equator. The angle of the equator relative to the middle of your grip is what determines, the RG that your ball will start on. This will also be affected by a bowlers PAP.

Sawuser · « **Reply #3 on:** March 22, 2007, 05:34:47 PM »

quote:
Grayson is correct, when you spin a symmetrical ball, the ball will go to the high RG spot still, but since the high RG spot is across the equator of the ball it will spin if you give it enough time throughout the equator. The angle of the equator relative to the middle of your grip is what determines, the RG that your ball will start on. This will also be affected by a bowlers PAP.

Are you saying cg nomaddah is bogus?

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south fl bowler · « **Reply #4 on:** March 22, 2007, 05:37:53 PM »

huh!!! cg do maddah
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leftehh- LG · « **Reply #5 on:** March 22, 2007, 09:02:13 PM »

CG IS JUST A BALANCE HOLE INDICATOR!
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laufaye · « **Reply #6 on:** March 22, 2007, 10:45:42 PM »

CG matters before you drill a ball, it helps you to have different options to manipulate reaction, after its drilled, where the CG position is no longer relevant.
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Laufaye

Re-Evolution · « **Reply #7 on:** March 23, 2007, 12:22:22 AM »

The cg marker is only put there so you know where the top weight is for x-hole placement if you want one.

The TRUE cg is near the center of the ball and has virtually no influence on ball reaction.

Completely forget about static weights for a minute and now visualize the core in the ball with the pin on your axis. I use axis cause it seems to make more sense to most. Now with that picture in your head and knowing that the true cg of the ball is within a 1/2" of the center of the ball how much can we actuall move the CG regardless of where you place the top weight marker.

Here is an experiment you can do. Go to your local tire store and ask for a 2oz clip style wheel weight and 2oz of adhesive backed wheel weights. Placing the clip style at the outer edge on your wheel will cause a vibration. However if you take the adhesive weights and place it within 1/2" of the axis of the wheel (inside the center cap) there will be no vibration cause it is too close to the center to have an influence. The CG of the ball falls under the same priciple of centrifigal force being the farther from the center of rotation a weight is placed the more force it will generate at any given rpm.

Forget CG it has absolutely nothing to do with core orientation, isn't the core sitting inside the ball at the same angle whether the pin out is 0 or 6 other than the small difference created by core shift which is only fractions of an inch even when comparing low top weight and short pin to high top and long pin or any other combination you want to use.

I can create pics to show a visualization of this if neccesary.

The bowling industry need to change the terminology for CG to TWI which is what it really is.
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Re-Evolution
Evolve to a smarter game.

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Edited on 3/23/2007 0:27 AM

vilecanards · « **Reply #8 on:** March 23, 2007, 12:36:18 AM »

wow... WAY more than I can comprehend! Hopefully/thankfully my driller does....
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r.k.wolfe

laufaye · « **Reply #9 on:** March 23, 2007, 02:30:52 AM »

quote:
The cg marker is only put there so you know where the top weight is for x-hole placement if you want one.

The TRUE cg is near the center of the ball and has virtually no influence on ball reaction.

Completely forget about static weights for a minute and now visualize the core in the ball with the pin on your axis. I use axis cause it seems to make more sense to most. Now with that picture in your head and knowing that the true cg of the ball is within a 1/2" of the center of the ball how much can we actuall move the CG regardless of where you place the top weight marker.

Here is an experiment you can do. Go to your local tire store and ask for a 2oz clip style wheel weight and 2oz of adhesive backed wheel weights. Placing the clip style at the outer edge on your wheel will cause a vibration. However if you take the adhesive weights and place it within 1/2" of the axis of the wheel (inside the center cap) there will be no vibration cause it is too close to the center to have an influence. The CG of the ball falls under the same priciple of centrifigal force being the farther from the center of rotation a weight is placed the more force it will generate at any given rpm.

Forget CG it has absolutely nothing to do with core orientation, isn't the core sitting inside the ball at the same angle whether the pin out is 0 or 6 other than the small difference created by core shift which is only fractions of an inch even when comparing low top weight and short pin to high top and long pin or any other combination you want to use.

I can create pics to show a visualization of this if neccesary.

The bowling industry need to change the terminology for CG to TWI which is what it really is.
--------------------

Re-Evolution
Evolve to a smarter game.

www.Bowling-Info.com
BR.com's unofficial FAQ section

Edited on 3/23/2007 0:27 AM

Remember long time ago in one of the articles on BTM by Bob Summervile, static weight measures Mass X Distance, Dynamic Weight(ball in motion) measures Mass X Distance Square.
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Laufaye

Author Topic: cg nomaddah??? (Read 3213 times)

BrunsWolf

cg nomaddah???

Grayson

Re: cg nomaddah???

purduepaul

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Sawuser

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south fl bowler

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leftehh- LG

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laufaye

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Re-Evolution

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vilecanards

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laufaye

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