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 Post subject: Balance Holes?????
 Posted: Sat Apr 28, 2018 9:03 am Post Number: #1 Post
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In another Thread currently, they are talking about some changes (apparently) that have to do with Ball construction (if I’m reading things right).

A week ago or so, I saw a guy in my local Pro Shop, picking up a ball that I presumed to be his, and noted that it had a thumb hole sized hole, drilled into the ball, but it wasn’t the hole the bowler used to hold the ball.

I speculated at the time, that perhaps this was a ball that this particular bowler didn’t want to replace, and decided to change the hole location(s) for whatever reason.

That raises two questions for me:

1. Why leave the old thumb hole drilled out? Why not plug it?
2. Is this a “balance hole?” What IS a “balance hole,” and when should it be considered?

I’m making the assumption that “balance holes” are legal for competitive play, and I wonder just how commonly a “balance hole” is found on players balls?

But wait a minute! It can’t ALL be based on mathematical location, can it?!

https://m.youtube.com/watch?v=CO_ZHmf3FGc

Doesn’t core design (shape) have to be taken into account, which has a direct effect on the way a ball rolls?!

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 Post subject: Re: Balance Holes?????
 Posted: Sat Apr 28, 2018 2:05 pm Post Number: #2 Post
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A Balance/Weight hole is a hole placed in a ball to either bring a ball back to USBC legal specifications in regard to static weight rules and/or too Increase or Decrease ball reaction.

If someone has a new thumbhole drilled they plug the old one, You just don't leave gripping holes unplugged and drill new ones somewhere else on the ball.

So yes what you seen was a balance hole most likely.

As for when should Balance hole be considered? When you need to make it static weight legal or want to Increase or Decrease ball reaction.

Yes currently Balance/Weight holes are legal for competitive play, But starting Aug. 1, 2020 they will no longer be legal.

The systems like the Gradient Line are basically designed to take the core design (MB/PSA, Your PAP, PIN etc.) into account.

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 Post subject: Re: Balance Holes?????
 Posted: Sun Apr 29, 2018 8:41 am Post Number: #3 Post
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bowl1820 wrote:
..............Yes currently Balance/Weight holes are legal for competitive play, But starting Aug. 1, 2020 they will no longer be legal..........


Well there it is...........

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 Post subject: Re: Balance Holes?????
 Posted: Mon Apr 30, 2018 8:59 pm Post Number: #4 Post
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After August 2020, ball selection and layouts will become much more critical to getting the desired ball motion.
Balance holes simplified this process, since a given ball could be drilled for slightly reduced diff, then tuned to higher diff or earlier hook phase with the balance hole.

IMO, symmetrical weightblocks will be more greatly affected by the rule change.

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