Thanks Mat!  I for one will be looking forward to your information.  Thanks for taking the time to do it!
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Dan

I've had my determinator for quite a while now and wouldn't think of not having one in my shop.

A determinator locates precisely where the mass bias is located within the ball, and can be used to determine the speed/strength of it.  Just as many cg's are not on spot, many of the mass bias markings are not accurate either.

When drilling symmetrical balls, the thumb hole, or very near it, is where the resulting mass bias always ends up being located.  However, adding an extra hole will move the mass bias a very small amount, and the determinator helps to find that resulting spot.  Because they are symmetrical, the mass bias tends to be relatively weak.

Well............... its very interesting .

Seriously though, its really making me think about what is the most influential part of the ball (outside of coverstock). Conventionally thinking, if you place the pin of the ball on your axis you will get 0 flare. However when you place the pin of the ball on the axis on the DeTerminator you generate maximum ball flare (because at that point the Mass Bias/PSA is the furthest it could be away from the balls actual PSA). As one would predict, I have found that when I lay the ball down so that my initial track rolls along the wheel is that the "stronger" mass biased layout (60-75 degrees) balls  take longer to find its PSA/Mass Bias. I found this to be true with a couple of my Battles. My "Mato-1" Battle http://i67.photobucket.com/albums/h305/Roto-Mat/BattleMato1.jpgtakes less than 3 seconds to find its PSA, while one of my (what would seem to be a stronger layout) other Battles http://i67.photobucket.com/albums/h305/Roto-Mat/BattleStrong.jpg
takes almost 8 seconds. Comparing these two balls, along with their spin times, would lead me to believe that a quicker spin time would lead to a much more defined movement when reading dry boards (barring cover prep/etc).

I will try to get some pics up tomorrow of a few balls with a grease pencil outline of the ball flare when placed into the determinator at different positions.
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Mat Henning
Roto-Grip Staffer
Owner/Operator of
Champions Bowling Services