Author Topic: Short pin, Long pin, Huh? (Read 3357 times)

dicnic · « **on:** May 21, 2009, 11:44:26 AM »

I understand most of the jargon regarding bowling balls. However, when buying a new ball and it lists the pin as 1 - 1&1/2 inches or much longer, from WHAT is the pin measured? And why?
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J_Mac · « **Reply #1 on:** May 21, 2009, 07:45:36 PM »

Pin center to Cg is pin out...

dicnic · « **Reply #2 on:** May 22, 2009, 04:21:19 PM »

I do not understand your comment!

Please, somebody post a sensible explanation or a link to same.

TIA
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ImBackInTheGame · « **Reply #3 on:** May 22, 2009, 04:28:32 PM »

pin length is the measurement, in inches, from the pin to the Center of Gravity (CG).

Copied from BR's FAQ section.

PIN PLACEMENT (Pin to CG)
A Pin-in ball (when the pin is located within two inches of the CG) is excellent choice for control and less hook a Pin-out ball usually can be made to hook more and flip more dramatically than pin-in balls they often give the driller more options.

To find out more go to http://www.ballreviews.com/Forum/Replies.asp?TopicID=74110&ForumID=16&CategoryID=5

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Edited on 5/22/2009 4:30 PM

Edited on 5/22/2009 4:31 PM

Juggernaut · « **Reply #4 on:** May 22, 2009, 04:41:11 PM »

The pin denotes the top of the weightblock in the ball. When the weightblock is shifted in any direction from perfect center, it causes the balls center of gravity to move also.

The further the weightblock is off, the further the cg is shifted from the pin along the surface of the ball. If I remember correctly, it only takes 1/16 of an inch from the weightblock being perfect to cause the cg to shift an inch.

The pin out distance is measured from the point where the center of gravity is marked on the balls surface ( the CG ), to the location of the pin.
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J_Mac · « **Reply #5 on:** May 22, 2009, 04:46:20 PM »

viola - 5" pin

http://i181.photobucket.com/albums/x16/madcelt2000/For%20sale/IMG_0418.jpg

JohnP · « **Reply #6 on:** May 23, 2009, 11:53:56 AM »

When you buy the ball, the box will just say, for example, 1 - 2" pin. They assume you know that means the distance from the center of gravity to the center of the pin, also called pin out distance. -- JohnP

Aloarjr810 · « **Reply #7 on:** May 23, 2009, 02:34:56 PM »

Ran across these bowling terms in Physicistsâ€™ language.

Mass distribution
Pin = Weight block symmetry axisâ€”intersection with ball surface.

Labe/CG = Center-of-mass offset axis before drillingâ€”intersection
with ball surface.

Pin in (out) = Center-of-mass axis before drilling and weight block
symmetry axis form an angle of 25Â° or less (or more).

(25Â° is around 1 7/8" pin to cg)

you can find more info here.

what_makes_a_bowling_ball_hook.pdf

This article, by Cliff Frohlich, was published in a 2004 issue of the American Journal of Physics. A scholarly look at ball motion.

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Edited on 5/23/2009 2:40 PM