BallReviews

General Category => Drilling & Layouts => Topic started by: captainhook on January 18, 2006, 10:44:32 AM

Title: Drilling out the mass Bias ??
Post by: captainhook on January 18, 2006, 10:44:32 AM

was looking at a ball today that the pin was right of the fingers,
 c.g in the middle of the grip and the thumb was drilled into the MB locator.


any reason for this ??  or what purpose does this serve ?? just courious thanks
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"THE ONE AND ORIGINAL CAPTAIN HOOK" NO IMITATIONS !!! 2002 MICHIGAN SCRATCH SINGLES CHAMPION

Title: Re: Drilling out the mass Bias ??
Post by: sportwood24 on January 18, 2006, 07:41:50 PM

My Zone Classic is drilled through the MB.  Just where it ended up upon measuring. but no big deal at all.
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"There are no stupid questions only stupid people"

Title: Re: Drilling out the mass Bias ??
Post by: dizzyfugu on January 20, 2006, 03:39:44 AM

Depends on the core. Principally, drilling holes into ball markings does not mean anything special. These are just markings, and if you want a specific reaction, drilling. e. g. a finger hole into the pin might just be necessary because any other position would not do the job.

But back to the topic: placing the MB/PSA marker onto the thumb hole can be a tactic for asymmetric core balls if you want to achieve a hook/set recation. On symmetric balls or aballs with a low MB rating, you place the MB at 135° from PAP to create this reaction - somewhere close or even on your track on the negative ball side. It tames down the back end reaction, pronounced midlane recovery and is generally a nice control drilling, especially for medium-dry shots.

On strong asymmetrical balls, like the Zone Classic, this PSA placement can cause flaring problems (especially for high trackers), even create reverse flare! To avoid this, the MB should not be place further to the negative side of the ball than the thumb hole area.
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DizzyFugu --- Reporting from Germany
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Title: Re: Drilling out the mass Bias ??
Post by: JustinWi on January 20, 2006, 07:44:09 PM

Depending on the type of mass biasing used, drilling into the indicator will have different effects.

Ellipse(Zone)
Drilling out the indicator pin will strengthen the mass bias of the ball.  Larger hole = Higher Z Diff.

Density(Storm)
Drilling out the indicator will weaken the mass bias of the ball.  Larger the hole = Lower Z Diff.

Offset(MoRich)
Not 100% sure on this one, but I would think it would behave the same as Extention/Density designs and weaken the Z diff if drilled in the indicator.

Extention(Ebonite)
Drilling out the indicator will weaken the mass bias.
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