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Author Topic: Interesting Dual Angle Drilling Info  (Read 4561 times)

Brickguy221

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Interesting Dual Angle Drilling Info
« on: April 28, 2015, 12:12:18 PM »
I found the information in the link below to be very informative, especially for people like myself that don't have a lot of knowledge about dual angle drilling. I always knew how to lay it out on a ball using a Pro Sect, just never understood exactly how all of the numbers worked, but now I understand better of how they work.

http://www.bowlersreference.com/Ball/Layout/Dual.htm
« Last Edit: April 28, 2015, 12:18:23 PM by Brickguy221 »
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xrayjay

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Re: Interesting Dual Angle Drilling Info
« Reply #1 on: April 28, 2015, 01:57:01 PM »
I found that site to be simple to read and understand.... I totally forgot about that site, good post....
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lefty50

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Re: Interesting Dual Angle Drilling Info
« Reply #2 on: April 28, 2015, 03:26:07 PM »
Hi Brick. Funny timing... I was given a dual angle layout and trying to understand how that layout was in relation to "low flare". This exact page came up in the search results. I'm like you, I understand it better now, at least until I forget it again... great site to bookmark, found some other stuff...
Thanks for putting it out there.
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JohnP

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Re: Interesting Dual Angle Drilling Info
« Reply #3 on: April 30, 2015, 11:58:12 AM »
I read this and have a few comments.  First, at the beginning of the article the author mixes up his terms, confusing psa (mass bias) with PAP (positive axis point).  I followed what he said, but someone with less familiarity with the procedure might have a problem.  The confusing quote is at the end of this post.

Second, his discussion of flare is correct for a symmetric ball, but an asymmetrical ball is different.  The difference is explained in the procedure.

Third, he neglects to explain that for a symmetrical ball the after-drilling psa will always be located near the thumb hole (until a balance hole is added).  Thus, the actual drilling angle will always be the same for a given bowler and is dependent on the PAP location.  Drilling a balance hole 2 - 2 1/2" down the VAL from the midline will pull the psa about midway between the thumb hole and the balance hole, resulting in a lower drilling angle and earlier transition from skid to hook.  --  JohnP

Quote
Typically, a bowling ball layout favors the end-over-end path, and it rolls around it's Positive Axis Point (PSA, or sometimes called the Mass Bias (MB) point.
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JohnP

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Re: Interesting Dual Angle Drilling Info
« Reply #4 on: April 30, 2015, 03:11:47 PM »
Quote from: JohnP on April 30, 2015, 11:58:12 AM
I read this and have a few comments.  First, at the beginning of the article the author mixes up his terms, confusing psa (mass bias) with PAP (positive axis point).  I followed what he said, but someone with less familiarity with the procedure might have a problem.  The confusing quote is at the end of this post.

Second, his discussion of flare is correct for a symmetric ball, but an asymmetrical ball is different.  The difference is explained in the procedure.

Third, he neglects to explain that for a symmetrical ball the after-drilling psa will always be located near the thumb hole (until a balance hole is added).  Thus, the actual drilling angle will always be the same for a given bowler and is dependent on the PAP location.  Drilling a balance hole 2 - 2 1/2" down the VAL from the midline will pull the psa about midway between the thumb hole and the balance hole, resulting in a lower drilling angle and earlier transition from skid to hook.  --  JohnP

Quote
Typically, a bowling ball layout favors the end-over-end path, and it rolls around it's Positive Axis Point (PSA, or sometimes called the Mass Bias (MB) point.

Edit:  I realized that the information I called Point 3 is fairly recent, in the last two years or so.  If the article is older than that the author didn't forget he simply wasn't aware.  --  JohnP
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Brickguy221

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Re: Interesting Dual Angle Drilling Info
« Reply #5 on: April 30, 2015, 04:00:42 PM »
For the people like myself, I found the article very informative and I learned a lot from it. In fact it answered what I didn't or never knew about dual angle drilling. I knew how to lay-out and measure a dual angle drilling on a ball, just wasn't aware of how the degree nos and what impact they had when increased or decreased, etc.

As for where the MB moves to when drilling holes and etc., and the tiny technical stuff, isn't important to "dummies kike me" and I doubt other dummies like me, as I am not that accurate nor consistent, and doubt I would ever notice the difference where the MB moved to, but other than that, I learned a lot from the article and other uninformed people will also as noted here and also on BBE.

I also posted it on BBE and labeled it "Dual Angle Drilling for Dummies like me" and should have done likewise here on BR
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JohnP

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Re: Interesting Dual Angle Drilling Info
« Reply #6 on: May 01, 2015, 12:00:00 PM »
No one that is interested in learning is a "dummy"!  I didn't mean to imply that it was a bad article, just to clarify a few things.  --  JohnP
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