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Author Topic: Drillers question  (Read 1005 times)

notsohotshot

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Drillers question
« on: November 18, 2008, 04:27:14 PM »
Help,I forgot what to do with blems with pins that are 8-9.5" from the cg.I am pretty sure you turn the ball up side down but I don't remember the rest.

 

Aloarjr810

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Re: Drillers question
« Reply #1 on: November 19, 2008, 08:38:59 AM »
Sometimes you might get a ball with a large Pin to CG placement.
This happens alot with Blems, x-outs and Pro Pin balls. which are all
just another name for seconds.

You wonder how to lay them out. A simple way to make it easy is
to located let's call it the "anti-pin". This is the point 180 degrees
around the ball directly opposite the pin.

Look at it this way, The normal pin is the Northpole and the anti-pin will be the southpole.

First thing before you start, weight the ball and verifiy the cg positon.
Just incase its mismarked.

To find the anti-pin just take your quarterscale and project a line halfway around the ball from the normal pin. Next turn the ball a quarter turn (90*) and project another line around the ball from the normal pin.

Where these lines cross will be your new pin location(anti-pin). Now you can layout the ball normally, using this as the new pin location.

Example-
A ball with a 9" pin to cg distance, the mb located between them.
PIN------MB---CG
[-------9"-----]

Project the pin 180 degree's around the ball.

Now you have a 4" pin to cg distance.
PIN----CG---MB
[-----4"-----]

What you have done is invert the core. The reaction for the ball should basically be the same doing this.

This works with symmetrical cores well, as for a asymmetrical core you'll have to check the MB position. Should be able to do it though.
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Aloarjr810
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Edited on 11/19/2008 10:29 AM
Aloarjr810
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