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Author Topic: Static weight chart?  (Read 3173 times)

Long Roller

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Static weight chart?
« on: December 13, 2006, 07:33:50 AM »
A few questions to clear some things up for me.

1.)  In general, I have heard that if you move the cg away from grip center it is equivalent to 1 oz for every inch you move.  Is this correct?

2.)  How does topweight affect this?  If I have a cg that is 2" right of center on the midline, how will a top weight of 2 vs a top weight of 4 oz affect the need for a weighthole?
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Edited on 12/13/2006 4:49 PM
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Laybzz74

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Re: Static weight chart?
« Reply #1 on: December 13, 2006, 03:36:55 PM »
I'm curious about this too ...
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shelley

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Re: Static weight chart?
« Reply #2 on: December 13, 2006, 03:43:38 PM »
The 1-inch-gives-1-ounce rule I've heard as well, but it's in reference to a specific starting top weight.  Probably somewhere between 2 and 3oz.  I'm not sure it's linear in the top weight, so a ball with 2oz of TW may not give half the ending weight of a ball with 4oz of TW.

SH
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Long Roller

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Re: Static weight chart?
« Reply #3 on: December 13, 2006, 03:46:31 PM »
I wonder what that starting top weight that is based on is.  That would be cool if someone had or made a chart on what 1 oz of static vs distance moved on a ball for different top weights.  There actually should be some sort of multiplier or math problem to figure this out as well....
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Strapper_Squared

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Re: Static weight chart?
« Reply #4 on: December 13, 2006, 03:48:19 PM »
I know that somewhere there is a chart that "estimates" these values given distance of shift and starting top weight.  My old ball drilled used to have one...  

It definitely would be a function of the starting top weight of a ball.. so I'm not sure you could use the 1" = 1oz estimate very confidently

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LuckyLefty

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Re: Static weight chart?
« Reply #5 on: December 13, 2006, 04:42:39 PM »
The 1 inch general rule refers to a ball with starting top weight of 3 ounces!

This why experienced ball drillers often recognize an illegal ball when they see it!

Clearly a 4 ounce topweight starting ball that shifts the cg 1 inch will have more side weight than a 2 ounce top weight starting ball.

The gravity balance system(from lane#1) has everthing one needs to calculate ending statics based on starting top weight and based on switching cgs off of grip center.

REgards,

Luckylefty
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JohnP

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Re: Static weight chart?
« Reply #6 on: December 13, 2006, 07:30:30 PM »
As LL said, for a ball with 3 oz of beginning top weight and the holes drilled to normal depth, 1" in any direction equates to about 1 oz of imbalance in that direction.  For example, if the cg is 1" to the right of grip center and 1" above the midline, you will have about 1 oz each of finger and positive side weight.  For top weights different than 3 oz, simply ratio the weights.  For example in the preceding example if the beginning top weight had been 2 oz, the finger and positive side weights would be about 2/3 oz.  --  JohnP
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Long Roller

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Re: Static weight chart?
« Reply #7 on: December 13, 2006, 07:44:43 PM »
I saw a layout with the cg above the fingers on a pin-in Angular One with the top weight like 1 3/4" without a weighthole.  How was this legal?
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Pinbuster

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Re: Static weight chart?
« Reply #8 on: December 14, 2006, 06:08:51 AM »
These rules can only be used as estimates of where to layout a ball.

Since CGs are miss-marked and weights on the side of ball boxes are sometimes wrong the ball SHOULD be balanced BEFORE drilling and then AFTER.

A ball can look legal and be illegal.

A ball can look illegal and can be legal.
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JohnP

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Re: Static weight chart?
« Reply #9 on: December 14, 2006, 10:00:23 AM »
quote:
I saw a layout with the cg above the fingers on a pin-in Angular One with the top weight like 1 3/4" without a weighthole. How was this legal?


As Pinbuster said, it is not uncommon to find the cg mismarked by as much as an inch even on a ball that's not an X-out.  If the cg is off, the top weight is probably off also.  They should always be checked before laying the ball out.  If the markings are correct, the finger holes are probably drilled extra deep.  You can take a lot of finger weight out by drilling two 31/32" holes (assuming grips) an extra 2" deep.  --  JohnP

Edited on 12/14/2006 3:43 PM
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shelley

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Re: Static weight chart?
« Reply #10 on: December 14, 2006, 10:15:43 AM »
quote:
I saw a layout with the cg above the fingers on a pin-in Angular One with the top weight like 1 3/4" without a weighthole.  How was this legal?


Drill the fingers deeper, drill the thumb shallower.  Drilling deeper is a pretty popular way to eliminate weight when sideweight isn't going to be an issue or if a weighthole is not wanted.

SH
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