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Author Topic: Pro-CG balls with dual angle layout?  (Read 2135 times)

1MechEng

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Pro-CG balls with dual angle layout?
« on: January 23, 2008, 01:54:32 AM »
Just like the title of the post implies, can you use the dual angle layout with a Pro CG ball (i.e. - any asymmetric ball with CG offset left of pin-MB line by 1-1/2" or so) and still achieve the desired results according to Mo's instructions?

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Dan
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Engineering * Bowling = a fun and practical application of rotational kinematics.

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SDSTREET

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Re: Pro-CG balls with dual angle layout?
« Reply #1 on: January 23, 2008, 10:59:41 AM »
I've drilled quite a few of these "PRO CG" balls.  Amazingly enough we seem to get a lot of these in our shop.  I think it will depend on the layout you want to use whether or not that particular "PRO CG" ball will work for you.  When I chose to use these particular "PRO CG" balls it was based on the size and depth  and location of a weight hole I wanted to use for a certain layout.
I haven't seen any MAJOR differences in the reaction of these balls using the "DUAL ANGLE LAYOUT TECHNIQUE".  Since MO's technique doesn't use the CG in the angle equation for asymmetricals (it does for symmetrical balls).  The ones that have a lower starting top weight(2.5 ounces or less) will allow you to have more layout choices and use the weight hole (if used) as a tuning instrument rather than just to make the ball "statically" legal.  
But I don't feel you have anything to worry about.
As always consult with a pro shop you trust to make sure it will be right for what you want to achieve.
Hope this helps ya...

SDSTREET
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1MechEng

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Re: Pro-CG balls with dual angle layout?
« Reply #2 on: January 23, 2008, 02:51:45 PM »
SDStreet -
Thanks for the response and the advice.
I was curious because on the MoRich site, the drilling instructions for the LevRG show that the CG is supposed to end up in a certain location with respect to the pin and the MB.

If the CG is out of the oval because it is a blem/2nd ball to start with, does it affect the location/necessity of the weight hole, and by association, the amount of potential flare for the ball?

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Dan
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Engineering * Bowling = a fun and practical application of rotational kinematics.

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NicholasE

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Re: Pro-CG balls with dual angle layout?
« Reply #3 on: January 23, 2008, 02:56:24 PM »
Well the CG just has to releativly close in that oval that you are referring to. I've seen them up to about 1 1/2" to the left and the ball works fine but if its more then that then I don't really know if that would be a blem, but it should work with the dual angle layout but the weighthole will have to be placed correctly.
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SDSTREET

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Re: Pro-CG balls with dual angle layout?
« Reply #4 on: January 23, 2008, 03:36:20 PM »
YOUR SECOND QUESTION
"If the CG is out of the oval because it is a blem/2nd ball to start with, does it affect the location/necessity of the weight hole, and by association, the amount of potential flare for the ball?"

ANSWER:
A combination of layout choice, cg shift location and starting top weight can limit or determine where and what size and depth a weight hole can be.  For example, if your chosen layout places the "PRO CG" above your midline (let's say 1.5" above) and your starting top weight is 3.5 ounces or more, your weight hole will more than likely need to be placed above the midline and vice verca if the "PRO CG" ends up below your midline.  As a note, weight holes are placed not just in relation to your PAP, VAL, and Midline, but are also placed in relation to core shift determined by your layout.  Any time you use a weight hole and it significantly removes enough mass from the core it can and usually does change the flare characteristics.  Because the core has now been reshaped to create a set of new mathematical properties. Weight holes are funky little creatures and can be your best friend or be gremlins and be your worst nightmare if chosen improperly. As NicholasE stated "the weighthole will have to be placed correctly".

SDSTREET
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