Difference between revisions of "Extra hole"

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==Definition==  
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==Definition==
Extra holes are used to fine tune reaction of a bowling ball.<br /><br />
 
  
*Extra holes are optional when considering a layout.
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A hole in the ball that is not used for gripping purposes and is not considered a vent hole.
*A maximum of 1 extra hole is allowed per ball
 
*Maximum diameter is 1 3/8" including [[bevel]]
 
*No limit to extra hole depth
 
  
Extra holes can fine tune a reaction based of a distance from positive axis point, [[midline]] and [[vertical axis line]] (VAL). Extra holes are usually placed on a line through the bowier's positive axix point, horizontally that reference line is the midline, vertially that reference line is the vertial axis line.
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==Purpose==
  
==Flare Increasing Extra Hole==
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Often referred to as balance holes, or weight holes, Extra holes were originally intended to keep the ball within static weight limits set by the USBC (then known as the ABC). This is no longer the case, though a ball with a extra MUST be within static weight limits.
  
A flare increasing extra hole is located below the positive axis point (PAP) on the vertical axis line.
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Extra holes are now an important part of the layout on a ball. According to Mr. Pinel, the extra holes account for up 84% of ball motion.
This location of the extra hole offers and increase in mid-lane, backend reaction and flare.
 
The further away the extra hole gets from the positive axis point at a limit of 6 3/4", the greater the influence on reaction.
 
  
Another location for a reaction enhancing extra hole is past the positive axis point on a line parallel to the midline.
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With the help of Steven Freshour, Mo Pinel created the Gradient Line Balance Hole System, which allows us to place an extra hole in specific places on the ball and accurately predict what the final ball motion will be. Using the Gradient Line, we decrease ball dynamics by 29% (P1), or increase ball dynamics by up to 55% (P4).
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Extra holes have direct effect on the intermediate differential and total differential, which in turn affect the differential ratio of the final ball.
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==Articles==
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See: [[Gradient_Line_Balance_Hole|Gradient Line Balance Hole]] - by Mo Pinel<br />
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[[Category: Glossary]]

Latest revision as of 08:37, 5 January 2012

Definition

A hole in the ball that is not used for gripping purposes and is not considered a vent hole.

Purpose

Often referred to as balance holes, or weight holes, Extra holes were originally intended to keep the ball within static weight limits set by the USBC (then known as the ABC). This is no longer the case, though a ball with a extra MUST be within static weight limits.

Extra holes are now an important part of the layout on a ball. According to Mr. Pinel, the extra holes account for up 84% of ball motion.

With the help of Steven Freshour, Mo Pinel created the Gradient Line Balance Hole System, which allows us to place an extra hole in specific places on the ball and accurately predict what the final ball motion will be. Using the Gradient Line, we decrease ball dynamics by 29% (P1), or increase ball dynamics by up to 55% (P4).

Extra holes have direct effect on the intermediate differential and total differential, which in turn affect the differential ratio of the final ball.

Articles

See: Gradient Line Balance Hole - by Mo Pinel