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Author Topic: Drilling the Thumb into the Cg  (Read 4504 times)

BigWillyStyle

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Drilling the Thumb into the Cg
« on: September 22, 2008, 03:29:50 AM »
Just wondering if anyone has tried this. Also, wondering if it came out legal weight without adding a weighthole.

I did this with an older ball I had, and when weighed on the dodo, came out about maximum for legal weight. Just wondering if anyone else has ever tried this.

Big Willy Style

PS...the only reason I decided to try this out, was I wanted to keep the ball around the same layout and reaction as one of my Cuda/C Solids, and with the pin difference, this was the only way to really keep pin just below the fingers. Thanks in advance for anyone with insight on this.
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scotts33

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Re: Drilling the Thumb into the Cg
« Reply #1 on: September 22, 2008, 11:34:50 AM »
No drilling guru here but I had a T S&A with a large target weight hole I think they are called near or on the CG which was drilled into the core I filled it but taking out weight in the core made it awry.  Not a good thing for me.  On a symmetrical not sure.

Good luck!
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los2003

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Re: Drilling the Thumb into the Cg
« Reply #2 on: September 22, 2008, 11:42:35 AM »
I'm pretty sure htis has been discussed search in the drilling section

quote:
Just wondering if anyone has tried this. Also, wondering if it came out legal weight without adding a weighthole.

I did this with an older ball I had, and when weighed on the dodo, came out about maximum for legal weight. Just wondering if anyone else has ever tried this.

Big Willy Style

PS...the only reason I decided to try this out, was I wanted to keep the ball around the same layout and reaction as one of my Cuda/C Solids, and with the pin difference, this was the only way to really keep pin just below the fingers. Thanks in advance for anyone with insight on this.
--------------------
Just my $0.02 so take it for what the Foreign Exchange values it at!
"I was raised by a cup of coffee..."
***This message brought to you by the A.O.B.U.B.O.A. (Assembly Of Back-Up Bowlers Of America) which is now taking applications***  
Honorary Member of the F.O.S. (and also the best back-up bowler the Saws have ever had)!
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hhsbowler

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Re: Drilling the Thumb into the Cg
« Reply #3 on: September 22, 2008, 04:23:22 PM »
It really depends on the top weight of the ball.  Most of the time if you move the CG down to the thumb that much you will probably end up with to much thumb weight.  Laying the ball out and then weighing it out is basically the only way to tell.  

Good luck.
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novawagonmaster

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Re: Drilling the Thumb into the Cg
« Reply #4 on: September 22, 2008, 07:29:20 PM »
As has been stated, top weight is a factor. You will likely end up with some thumb weight. I would start by keeping the fingers as shallow as possible.

Just as a "what if...?":
Say you drilled the thumb for a 1-1/4 slug at "zero" pitch (let's say that is the bowler's actual pitch). Then you went back in with a 1" bit at a radical reverse pitch just under the surface. You have basically drilled an upside down "V". Now throw a 1-1/4" slug in (the fist hole) and drill it to fit the bowler. I know it "can" be done, but is it legal? Is there any reason it should not be done?

I'll likely never run into this scenario, but I figured it could make for entertaining discussion
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Edited on 9/22/2008 7:36 PM
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los2003

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Re: Drilling the Thumb into the Cg
« Reply #5 on: September 22, 2008, 08:02:41 PM »
it was just recently.. maybe 2 weeks

quote:
i'm pretty sure you should contribute to the thread before telling someone how to get an answer. not everyone wants to use the search hack to look back 3 years to find a thread.

quote:
I'm pretty sure htis has been discussed search in the drilling section

quote:
Just wondering if anyone has tried this. Also, wondering if it came out legal weight without adding a weighthole.

I did this with an older ball I had, and when weighed on the dodo, came out about maximum for legal weight. Just wondering if anyone else has ever tried this.

Big Willy Style

PS...the only reason I decided to try this out, was I wanted to keep the ball around the same layout and reaction as one of my Cuda/C Solids, and with the pin difference, this was the only way to really keep pin just below the fingers. Thanks in advance for anyone with insight on this.
--------------------
Just my $0.02 so take it for what the Foreign Exchange values it at!
"I was raised by a cup of coffee..."
***This message brought to you by the A.O.B.U.B.O.A. (Assembly Of Back-Up Bowlers Of America) which is now taking applications***  
Honorary Member of the F.O.S. (and also the best back-up bowler the Saws have ever had)!
Visionary Test Staff Member ''08-''09

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Doug Sterner

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Re: Drilling the Thumb into the Cg
« Reply #6 on: September 22, 2008, 08:41:42 PM »
nova....as far as what I know what you are suggesting is illegal...you cannot create intentionally create a sealed void within the ball.

I may be wrong but I recall hearing about this somewhere. I think it was in reference to not drilling all the way through a thumb slug.

As I said I may be wrong......Lord knows it has happened before.
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Pinbuster

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Re: Drilling the Thumb into the Cg
« Reply #7 on: September 23, 2008, 07:34:23 AM »
Doug I agree on the creating a void.

Under the USBC ball specifications.

Material:
1. The ball shall be constructed of solid material ie: no
liquids, and without voids in its interior.

2. Any materials added to or included in the coverstock
shall be equally distributed throughout the entire
coverstock of the ball, except for materials used in
logos and other required markings.


Number 1 says a ball can not be built with internal voids.

Number 2 asys to me that any hole filled would have to be completely filled.

Lastly even if this was legal I don't know how long the ball would last. I would think the undermined area would crack and break away in short order.

Like others have said if the top was low enough you might be able to pull this off without a weight hole.

But I have to believe the reaction of a heavy thumb weighted ball would be significantly different than a finger weighted ball even if the pin was in the same position.
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DrillLord

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Re: Drilling the Thumb into the Cg
« Reply #8 on: September 23, 2008, 07:46:33 AM »
You can double drill a thumb.  First, take a 1 1/8 bit and drill as far as it will go.  Then, use a 1 1/4 bit deep enough to insert your slug.  Finally drill the slug to fit your thumb.  This is legal by all USBC standards.

If you like 1 3/8 slugs you can even use a 1 1/4 bit for the first hole.
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Pinbuster

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Re: Drilling the Thumb into the Cg
« Reply #9 on: September 23, 2008, 09:19:45 AM »
But you have to drill completely thru the slug when you drill the thumb hole in the slug so there is no hidden void.

Plugs & Designs:
1. Plugs may be inserted for the purpose of redrilling
the ball. A slug may only be used in place of plugging
a thumb or finger hole when a new weight hole
is drilled completely through the slug. If no hole is
drilled, this will leave a void at the base of the slug,
thus considered out of compliance.
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DrillLord

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Re: Drilling the Thumb into the Cg
« Reply #10 on: September 23, 2008, 10:42:48 AM »
Correct, but you must always drill through a slug so there is no sealed void beneath it.

You can NEVER insert a slug and not drill all of the way through it.

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BigWillyStyle

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Re: Drilling the Thumb into the Cg
« Reply #11 on: September 23, 2008, 12:11:32 PM »
OK, first of all, thanks everyone who responded with the info. I guess I can clear a few things up about my drilling habits so-to-speak.

First off, I use a custom mold, so the whole "blocked off" void wouldn't apply, since both ends of my custom mold are open. I know that when the driller punched this ball up, he did first put the 1 3/8 hole in for the mold...then switched bits to I believe 1" and drilled at a bit more of a backward angle to take a bit more out.

The main reason I was asking, is because I really, REALLY like the reaction of this ball (Visionary DC Tour Edition to be exact), as the backend is STRONG but I would hate to take it somewhere like Nationals and find out is't considered "illegal". Like I said in the OP, We put it on the dodo, and it came out legal....but at maximum end of legal, and I'd really rather keep a weighthole out of an older 2nd drill ball if able to. Thanks again so far for all the knowledge invested into this post so far.

Big Willy Style
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Just my $0.02 so take it for what the Foreign Exchange values it at!
"I was raised by a cup of coffee..."
***This message brought to you by the A.O.B.U.B.O.A. (Assembly Of Back-Up Bowlers Of America) which is now taking applications***  
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novawagonmaster

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Re: Drilling the Thumb into the Cg
« Reply #12 on: September 24, 2008, 11:52:40 AM »
So you have done what I suggested.

As for creating a void, as long as the mold (or slug) is open at the bottom, there will not be a sealed void.

I see this as being one of those "grey areas" that could be left open to interpretation. You are not deliberately breaking any rule, just acting according to your interpretation of the rule.
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aka: Rico Swervé~

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