BallReviews

General Category => Drilling & Layouts => Topic started by: LuckyLefty on January 14, 2016, 11:25:05 PM

Title: Conventional grips and deep finger holes into high end cores.
Post by: LuckyLefty on January 14, 2016, 11:25:05 PM

SO....a guy in my house buys high end balls and drills them conventional grip.  Maybe standard but his fingers are drilled 3 to 3 1/2 inches deep.  Thumb at least 3.

I can see how this would make no difference on old pancake core but how do you think it effects a high end core like say....a Marvel?  I note lots of dense dark core material has been removed in a couple of his high balls for sale with these deep holes.

I have purchased one of his in the past but it seems weaker than other's I have seen of a similar ball, ie maybe this has been caused by the large amount of high density core drilled out near the fingers versus a similarly drilled fingertip with their much shallower holes?

Any thoughts?

Thanks,

Regards,

Luckylefty

Title: Re: Conventional grips and deep finger holes into high end cores.
Post by: kotm on January 15, 2016, 05:19:57 PM

Pin above finger drillings will usually lose a little differential, but gain intermediate, which helps the ball transition quicker.  In pin down layouts, the loss of diff is a little more drastic, so the smoothing is more noticeable.

This is a good read by Steve Freshour modeling a pin up layout...

http://wiki.bowlingchat.net/wiki/index.php?title=Effects_of_Drilling_Finger_Holes_Deeper (http://wiki.bowlingchat.net/wiki/index.php?title=Effects_of_Drilling_Finger_Holes_Deeper)

Title: Re: Conventional grips and deep finger holes into high end cores.
Post by: BallReviews-Removed0385 on January 15, 2016, 06:20:47 PM

Lefty,

I would estimate that a bunch of core would need to be removed before any drop in performance could be measurable AND attributed to that one thing only.

Maybe the ball lost performance because it was... old...

Title: Re: Conventional grips and deep finger holes into high end cores.
Post by: LuckyLefty on January 15, 2016, 08:57:57 PM

KOTM,

That table is EXACTLY what I was looking for.

As always NotClay thanks for the helpful comments.  The ball is not old but I was having slight release problems and the pearls for me in this house need to track a little bit for me!

I now understand the effect of the deep fingers.  Acceptable!

Regards,

Luckylefty

Title: Re: Conventional grips and deep finger holes into high end cores.
Post by: JustRico on January 15, 2016, 09:12:08 PM

The bowling ball does not know what grip is drilled into...it is simple...size of hole primarily and depth in what portion of the core
Dave Guidon had a mitt...his finger holes were close to 15/16" and his thumb was in the 1 1/8"...fingertip