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Author Topic: Pin, CG, MB Question  (Read 2951 times)

TheGom

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Pin, CG, MB Question
« on: January 11, 2008, 03:56:03 PM »
I am seeing a ton of balls with these three marks on the ball not lining up very well.......it seems one cannot draw a straight line through the pin, into the GC, and have it hit the MB, as it's always to the left or right.........Is this the norm now? If it is, is it best to have the MB to the right or the left of that line draw from the Pin thru the GC for a right hander and why?
Thanks
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Maine Man

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Re: Pin, CG, MB Question
« Reply #1 on: January 12, 2008, 12:01:04 AM »
Draw the line from the Pin to the MB.  Don't worry about the CG, it does not make that big of a difference in the first place.  As soon as you drill a hole in the ball, the marked "CG" is no longer the balls true "CG" anymore.  Worry about Pin location and MB location before sweating about if the CG lines up with the Pin and MB.  Good luck!
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MainePBA
"Power tends to corrupt; absolute power corrupts absolutely." Lord Acton
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TheGom

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Re: Pin, CG, MB Question
« Reply #2 on: January 12, 2008, 12:13:48 AM »
Good To Know.......thanks BG
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T-GOD

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Re: Pin, CG, MB Question
« Reply #3 on: January 12, 2008, 12:43:56 AM »
quote:
 Don't worry about the CG, it does not make that big of a difference
It does make a differnce, but what is not that big to you, may seem really big to someone else, or vice a versa. =:^D
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Maine Man

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Re: Pin, CG, MB Question
« Reply #4 on: January 12, 2008, 01:32:24 AM »
quote:
quote:
 Don't worry about the CG, it does not make that big of a difference
It does make a differnce, but what is not that big to you, may seem really big to someone else, or vice a versa. =:^D


According to USBC data, and other tests that have been performed, the real world difference in cg position is negligible.  It may be a board, maybe 2 boards, difference AT MOST.  Most bowlers miss by more boards than that from shot to shot.  I was not saying that it did not make ANY difference, only to inform the poster that the Pin and MB position are of GREATER importance than worrying about the cg not being lined up with the Pin and MB.  If you want to get technical, having a cg set right of the Pin will give you more ending positive weight, and a cg located left of the Pin will give you more ending negative weight (side to side) for a right handed bowler.  These subtle differences can be offset by putting a weight hole in the ball IF you want to compensate for an offset cg. So, like I said in my original post, the cg position lining up relative to the Pin and MB is of little to no importance when selecting a ball.  Take care, and good luck.
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MainePBA
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shelley

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Re: Pin, CG, MB Question
« Reply #5 on: January 12, 2008, 07:23:59 AM »
The CG may not affect ball reaction in a significant way for today's balls with strong dynamics, but it most assuredly cannot be ignored if you want the ball to be legal for sanctioned competition.  I'd like to see all the folks who are so quick to say to ignore the CG to take 10 balls without a marked CG and drill them all up to be legal.

TheGom: It is unusual for the CG to lie exactly on the pin-MB line.  For first quality balls, it should be less than an inch off the line, more than that and it may be a blem (2nd, X-out, pro-CG).  For a right-handed bowler and today's strong asymmetrics, it's best to have the CG to the left of the pin-MB line (the MB to the right of the pin-CG line).  That allows you to place the MB almost anywhere between the thumb and VAL or beyond without moving the CG too far from grip center.  For a lefty, it's the opposite.

SH
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