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Author Topic: Maximum weight hole drill bit size?  (Read 4976 times)

LuckyLefty

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Maximum weight hole drill bit size?
« on: May 04, 2003, 01:32:42 AM »
Anyone know the legal maximum size???

REGards,

Luckylefty
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TTforshort

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Re: Maximum weight hole drill bit size?
« Reply #1 on: May 04, 2003, 04:39:17 PM »
One hole for balance purposes, not to exceed 1-1/4 inch in diameter.

Quoted from ABC rulebook.


TT

Edited on 5/4/2003 5:31 PM
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Doc Hollywood

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Re: Maximum weight hole drill bit size?
« Reply #2 on: May 04, 2003, 04:59:32 PM »
1 1/4" is I believe the maximum, but somewhere in my mind I remember reading that for some rules and for the life of me I can't recall sorry. The hole size was a little smaller to be legal.
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1fife

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Re: Maximum weight hole drill bit size?
« Reply #3 on: May 04, 2003, 05:10:12 PM »
i believe that is it, but usually a drilled hole is beveled a bit-so that would make 1 1/4 to big

also if its pitched it will be slightly bigger

i only go 1 1/8 to be safe
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STBCrushEm

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Re: Maximum weight hole drill bit size?
« Reply #4 on: May 04, 2003, 05:42:16 PM »
does weight hole make the ball turn sooner or later down the lane?
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STBCrushEm

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Re: Maximum weight hole drill bit size?
« Reply #5 on: May 04, 2003, 05:42:49 PM »
quote:
does the weight hole make the ball turn sooner or later down the lane?
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10 In The Pit

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Re: Maximum weight hole drill bit size?
« Reply #6 on: May 04, 2003, 09:16:45 PM »
Yes, the limit is definitely 1 1/4" in diameter.  And yes, if the weighthole is pitched, it will make the diameter larger than the actual drill bit that is being used.  I know of several drillers who won't go larger than 1 1/8", so that any pitching or beveling won't make the weighthole break out of specifications.

I recall an incident that happened to one of my friends at the 1995 ABC Nationals in Reno.  He had a 1 1/4" weighthole in his ball, and there was a small ding in the coverstock on the edge of the hole (where a pinwheel had caught it).  The ball inspection rep wasn't going to allow him to use the ball until he found out that this fellow didn't bring anything else to use.  Then, the ball inspector told him to go ahead and use the ball, but to get the weighthole repaired before using it in the ABC tournament again.  We are talking about a little ding on one small section of the edge of the weighthole!....the cut was no larger than the diameter of a pencil lead.

So, it is a wise idea to stop short of drilling a maximum diameter hole of 1 1/4", just to be on the safe side.
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Constantine

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Re: Maximum weight hole drill bit size?
« Reply #7 on: May 05, 2003, 09:55:25 AM »
quote:
does weight hole make the ball turn sooner or later down the lane?


Sooner
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Good luck & good bowling

Bujo

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Re: Maximum weight hole drill bit size?
« Reply #8 on: May 05, 2003, 05:41:40 PM »
quote:
quote:
does weight hole make the ball turn sooner or later down the lane?


Sooner


Correct me if i am wrong, but i thought that a weigh hole could raise and lower the amout flare depending on its relationship to the bowler's PAP; not smply make it roll sooner.
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Edited on 5/5/2003 5:48 PM

Edited on 5/5/2003 5:48 PM
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Constantine

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Re: Maximum weight hole drill bit size?
« Reply #9 on: May 05, 2003, 05:54:54 PM »
quote:
Correct me if i am wrong, but i thought that a weigh hole could raise and lower the amout flare depending on its relationship to the bowler's PAP; not smply make it roll sooner.


Weighthole removes weight from the cover, so the ball becomes more center-heavy, or in other words weightholes lower RG.  Lower RG means more roll.

A weighthole off PAP will create a greater imbalance in the dynamics of the ball which will add to the flare potential.  Greater flare also means more roll.   (A weighthole on PAP doesn't affect flare.)

Edited on 5/5/2003 6:02 PM
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Bujo

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Re: Maximum weight hole drill bit size?
« Reply #10 on: May 05, 2003, 06:11:15 PM »
I see, thanx for the correction
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JK300JP

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Re: Maximum weight hole drill bit size?
« Reply #11 on: May 05, 2003, 07:46:45 PM »
Big weight hole, distant 3.3/8in. from PAP, increases flare.

Big weight hole on PAP reduces flare.

But this is minor adjustment.
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LuckyLefty

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Re: Maximum weight hole drill bit size?
« Reply #12 on: May 06, 2003, 04:00:30 AM »
Regarding this issue, there is actually quite a bit of debate on this subject.

Brunswick claims weightholes on PAP reduce flare and weightholes past the pap increase flare.

Lane#1 on the other hand has done experiments that in my mind verify that weightholes increase or decrease reaction but do not increase flare.

Experiment is drill a pin on pap ball.  Drill weighthole on PAP.
Very little flare or reaction.  Now on same ball plug weighthole and drill a weighthole 9 inches from the grip center in a 3:30 direction.  NO increase in flare but a big increase in reaction.  Note side weight reduced and top weight increased.

I have found big differences in reactions by weighthole placements.  But of course due to my medium revs, side release and softer speed I magnify all ball reactions a lot.

3 types of basic weightholes in my mind.
1. on pap, adds stability and midlane reduces backend
2. Way past pap and on southern hemisphere of the ball(takes out bottom weight and adds top weight reduces midlane) and adds backend.
3. On pap but drilled with 1 inch lateral out pitch (points weighthole towards bottom of ball and for many bowlers(pap near 5 inches adds top weight), and again increases backend reaction. I've been placing these in a couple of balls lately and really liking the results.  Actually have only been pitching 1/2 inch south(lateral out, increased midlane and still a moderately strong backend reaction.

3 variants
1. Rev leverage hole.  Hole placed way down VAL(cg is also down below grip center and somewhere near thumb).  This hole really assists the ball in revving early in high volume head oil situations.  (see Ebonite drill sheets).
2. Very large diamater weightholes, (1 1/8 to 1 1/4) these weightholes do seem to add some overall flare to the ball to my eye if off pap(no experiments done).
3. Weightholes inside of pap closer to grip center.
These take out mostly top weight and REALLY reduce reaction at the backend.

This is all I know.  Almost.

REgards,

Luckylefty
PS I have drilled many balls over the past year with weightholes 7 inches from grip center and 9 inches from grip center, in general not a good fit for me!
But above pap drilling(straight in)(world team challenge or tour type shot), or pap with lateral out(more reaction), or down the VAL(early reaction) or large holes all work for me.
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