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Author Topic: Pin/MB layouts vs Pin/CG layouts  (Read 1033 times)

5150BWLR

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Pin/MB layouts vs Pin/CG layouts
« on: April 05, 2009, 10:40:54 AM »
Pin-MB layouts vs Pin-CG layouts (i.e. 4x4 from pin to MB vs 4x4 pin to CG) . When do you consider to use them? (I.e. Cell, it's suggested to use a pin-MB layout). Are PIN-MB layouts used more on Asymetrical core balls?
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charlest

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Re: Pin/MB layouts vs Pin/CG layouts
« Reply #1 on: April 05, 2009, 08:17:19 PM »
quote:
Pin-MB layouts vs Pin-CG layouts (i.e. 4x4 from pin to MB vs 4x4 pin to CG) . When do you consider to use them? (I.e. Cell, it's suggested to use a pin-MB layout). Are PIN-MB layouts used more on Asymetrical core balls?


FOr balls with asymmetric cores and a mass bias strength equal to or greater than .008", it is essential for the ball driller to lay them out using the pin and the MB and to ignore the CG. The CG's only importance in such balls is when it's time to insure they meet the USBC's rules for static weights.

SYmmetric cores have what is termed a virtual MB (not an imaginary one). It is normaly conceived of as being from the pin through the CG for a length of 6 3/4", 1/4 of the ball's circumference or 1/2 the ball's diameter. That virtual MB can be used to drill balls.

The virtual MB of a symmtric cored ball has much less significance to the drilling of a symmetric core than the real MB of an asymmetric cored ball. The larger the MB rating/strength of an asymmetric cored ball (some are as high .035") the more important the proper positioning of the MB is to ball reaction.
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