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Author Topic: CG miss mark? Matter?  (Read 2796 times)

Bluff

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CG miss mark? Matter?
« on: August 29, 2009, 06:06:43 AM »
I have been checking some new balls that I buy from ebay and it has no cg mark.
So I use Lane #1 instruction and Find the CG.

I also try it on marked one and they don't seems to match the factory location.
So base on that should I use factory mark or the one I find?

IT ALSO SEEMS is NEVER marked right on.

any thoughts?
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mainzer

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Re: CG miss mark? Matter?
« Reply #1 on: August 29, 2009, 02:20:38 PM »
CG NOMADAHH!!
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JohnP

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Re: CG miss mark? Matter?
« Reply #2 on: August 29, 2009, 02:44:08 PM »
If you're using the location method correctly it will give the true cg.  Most factory marks are close but not right on, maybe off 1/8 - 3/8".  I have checked some that were off by more than 1".  If you're consistently missing the factory mark a bunch, check your procedure.  Another check you can use -- when the true cg is located at top dead center of the ball in the scale, the scale will remain balanced as you rotate the ball in the cradle (keeping the cg at top dead center).  --  JohnP

Added on edit:  And the cg location on the undrilled ball does matter if you want to drill the ball so it's legal on static weights without using a balance hole.

Edited on 8/29/2009 2:46 PM
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Bluff

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Re: CG miss mark? Matter?
« Reply #3 on: August 29, 2009, 03:36:57 PM »
quote:
If you're using the location method correctly it will give the true cg.  Most factory marks are close but not right on, maybe off 1/8 - 3/8".  I have checked some that were off by more than 1".  If you're consistently missing the factory mark a bunch, check your procedure.  Another check you can use -- when the true cg is located at top dead center of the ball in the scale, the scale will remain balanced as you rotate the ball in the cradle (keeping the cg at top dead center).  --  JohnP

Added on edit:  And the cg location on the undrilled ball does matter if you want to drill the ball so it's legal on static weights without using a balance hole.

Edited on 8/29/2009 2:46 PM


ah good pt there JohnP Thanks
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themagician

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Re: CG miss mark? Matter?
« Reply #4 on: August 29, 2009, 03:41:11 PM »
The pro shop i go to checks every ball, its amazing how frequently balls are mismarked CG wise from the factory and sometimes its extremely far off. Its not good to see but its an easy fix.
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Warmon

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Re: CG miss mark? Matter?
« Reply #5 on: August 29, 2009, 05:02:03 PM »
Guys, do you see CG mismarked balls from all manufacturer's, or is it more prevalent in some brands vs others?
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themagician

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Re: CG miss mark? Matter?
« Reply #6 on: August 29, 2009, 05:22:00 PM »
I've seen it across all companies, normally the markings are really close, but on occasion from every company we see a ball or two thats really off. Its always worth taking the time and making sure the ball is right.


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-Mike
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Guined

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Re: CG miss mark? Matter?
« Reply #7 on: August 31, 2009, 10:55:01 AM »
Most of the time I don't initially check the CG. I do weigh every ball after I lay it out to verify statics. If I run across a ball that has an unusual amount side, finger or thumb then I will go re-check the CG Location.

JohnP is correct though if you want to have layout without a balance hole then re-check the CG location.

More importantly is to check the PSA "Mass Bias" on an asymetric and the low RG axis "The Pin" on a symetrical ball. I have found symetrical core balls where the the low RG axis up to 3" off. If you don't check this and have one like this you can think your drilling a 5" pin layout and are really drilling a 2" pin layout. You will end up with a reaction shape you weren't looking for.

You will need a determinator to do this. It is a great investment in providing better quality service to your customers.
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