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Author Topic: Would CG near PAP be legal?  (Read 2788 times)

legend4life95

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Would CG near PAP be legal?
« on: March 13, 2006, 12:58:58 PM »
I am trying to layout my BIG ONE and the pin,cg,mb are'nt exactly inline. The cg is about 1" right from being inline. Now I want to put the pin 3-3/8 from pap and keep the MB right of thumb. This is causing the the cg to be 3-1/4" right of gripline and 1-1/4 below midline. Is it possible to bring this ball back legal without drilling a huge hole? And will the cg that close to pap cause the ball to act any different than if it was closer to grip? Here are the specs on ball: Also my info is in profile

15 lbs. 3 oz.
3 oz. Top
3"-4" pin


Here is a pic of about what it would look like. Dont laugh and my rough layout copy layout. I am just trying to see what its gonna look like before letting my driller lay it out.



http://allbowling.com/gallery/showimage.php?i=123&c=3

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J_Mac

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Re: Would CG near PAP be legal?
« Reply #1 on: March 13, 2006, 09:15:58 PM »
Expect a LARGE weighthole and don't expect to get it to where it doesn't have positive weight.

Also, if you're so worried about a large weight hole move the pin up (you can still maintain 3 3/8 from PAP) and swing the CG/MB closer to the thumb while still maintaining close to the same MB to PAP distance.  Even then you'll likely need a balance hole, but it wouldn't be as large.
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"A word to the wise ain't necessary -- it's the stupid ones that need the advice."  Bill Cosby

Edited on 3/13/2006 9:23 PM
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charlest

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Re: Would CG near PAP be legal?
« Reply #2 on: March 13, 2006, 09:17:10 PM »
I don't know the answer to your question, but may I politely and very strongly suggest that you reconsider this layout. This is a VERY strong ball and I think this drilling will make your ball try to go into a roll super early. I think this ball  will be severely limited to extremes of super-heavy oil.

Your profile says you have a 500 RPM rate and an 18 mph ball speed. I believe this drilling may not be suitable for you.

If you haven't already tried one, is there anyone you can try someone else's Big One just to give you an idea how strong this ball really is?

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(That includes me too, at times! )
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"None are so blind as those who will not see."

JohnP

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Re: Would CG near PAP be legal?
« Reply #3 on: March 13, 2006, 10:21:29 PM »
Before you have this ball drilled, be sure your driller manually checks the cg location and amount of top weight on a dodo scale.  I have seen Ebonite balls with the cg mislocated by over an inch and the amount of top weight off by an ounce.  Of course, on a ball with an asymmetric core, you might as well pretend the cg mark isn't there anyway.  Just lay it out using the pin and mb, then weigh it to see if you need a balance hole.  --  JohnP
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legend4life95

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Re: Would CG near PAP be legal?
« Reply #4 on: March 13, 2006, 11:20:41 PM »
The reason I chose a 3-3/8 pin to pap is b/c I have a couple other balls drilled like that although they are symetric balls and they react the best for me on oily lanes. I want it to have good midlane and strong arc in the backend. The reason I need a strong layout with as many revs as I have is b/c I have alot of sideroll and that gives me alot of length on heavy stuff. I will try to move the pin higher and still keep the mb right and see if I can take another picture. Maybe someone can tell then if it looks like it will be legal.
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charlest

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Re: Would CG near PAP be legal?
« Reply #5 on: March 14, 2006, 07:48:33 AM »
quote:
The reason I chose a 3-3/8 pin to pap is b/c I have a couple other balls drilled like that although they are symetric balls and they react the best for me on oily lanes. I want it to have good midlane and strong arc in the backend. The reason I need a strong layout with as many revs as I have is b/c I have alot of sideroll and that gives me alot of length on heavy stuff. I will try to move the pin higher and still keep the mb right and see if I can take another picture.
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****Kids in the back seat cause accidents; accidents in the back seat cause kids.****


OK. Good luck
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"None are so blind as those who will not see."
(That includes me too, at times! )
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"None are so blind as those who will not see."

legend4life95

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Re: Would CG near PAP be legal?
« Reply #6 on: March 14, 2006, 04:43:41 PM »
Ok, I tried alot of different ways and came up with this. Layout is 4x4 now and I got the pin higher. The cg is still out approx. 2-1/4 from midline. Will this still be pretty strong and have good midlane with the pin above ring? Here is the pic of the new layout.
http://allbowling.com/gallery/showimage.php?i=124&c=3


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****Kids in the back seat cause accidents; accidents in the back seat cause kids.****

Edited on 3/14/2006 5:44 PM
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legend4life95

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Re: Would CG near PAP be legal?
« Reply #7 on: March 14, 2006, 09:09:11 PM »
ttt
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stanski

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Re: Would CG near PAP be legal?
« Reply #8 on: March 14, 2006, 09:10:36 PM »
That ball is going to make a hockey stick turn at the breakpoint with the pap/style that you have and a 4x4 drilling.

May I politely suggest, that with the read that you want, go with something like pin 5 inches from pap under bridge, mb at 45-60 degrees (depending on how angular you want to go). With your revs, I think you really need to get the pin farther away from the pap and still try and keep it down low (to get that good midlane read).

Don't worry about where the cg ends up, just weigh it out and get it legal. You should be able to help this out if you drill the ring finger very deeper (gets rid of positive side) and thumb deeper (gets rid of thumb weight), allowing a smaller weighthole, if that is what you desire. Shouldn't be too tough as the top weight isn't too large.

My opinion, just take the original drilling and stretch the pin out another inch and a half and keep a similar mass bias angle.
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stanski

Edited on 3/14/2006 10:10 PM
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legend4life95

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Re: Would CG near PAP be legal?
« Reply #9 on: March 15, 2006, 05:42:09 AM »
quote:
May I politely suggest, that with the read that you want, go with something like pin 5 inches from pap under bridge, mb at 45-60 degrees (depending on how angular you want to go). With your revs, I think you really need to get the pin farther away from the pap and still try and keep it down low (to get that good midlane read).

 




If I move the pin another inch farther to 5", would'nt that give me even more length? Is there that much difference in pin below and pin above? I thought pin to pap distance was the main factor? I will be using it on heavy oil and need it to be drilled aggressive.

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****Kids in the back seat cause accidents; accidents in the back seat cause kids.****
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legend4life95

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Re: Would CG near PAP be legal?
« Reply #10 on: March 15, 2006, 12:05:32 PM »
ttt
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****Kids in the back seat cause accidents; accidents in the back seat cause kids.****
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