I drilled a new Mutant Cell this am.

I put the same drilling on it that is on my Virtual Energy, Dual Thumb, which I have had on several balls.  

I have doubled check all the measurements.  The ball rolls over the thumb.  Depending on my release, it will start on the thumb after a rev or two, then flare away, or it will start rolling ok, and about 15/20 feet down the lane it will start bumping down the lane.  I used two different wrist braces, same result.  I had three other balls with me drilled exactly the same measurements, one with the same layout and they all rolled great, (all shiny).

I have tried every release I know, but at some point it rolls over the thumb.

I have had this problem, three times in the last 6 months, everytime it has been a ball with an aggressive surface without polish.  This ball, my Dynamo and ocassionally my 930 Track.  I have never been able to solve the problem.


Questions:



1.  What thumb pitch change can I try to move my track away from my thumb?  I am currently 3/16 away, 1/8 forward.

2.  Can a too aggressive surface, cause a track to be in a different place than a shiny surface which enables the ball to skid a little at release.

3.  Any other suggestions?



Tom

If your thumping and also have a weight hole down in a ball, then your thumb might be exiting too quickly. Take a look at your actual thumb sizing in the ball. If you use an oval, check to see if the oval is true and lines up correctly. If it is off even 5*, it could make you flip your thumb out early to clear and put your track right on the thumb.

Also check where your axis pts are. Some folks can not throw pin under balls because it pulls the track down too much even with a hole down. If this is the case and you are looking for something that is smoother off friction, then you may have to adjust the height of your pin placements.

Myself I can only go pin slightly under my fingers. If I get the pin too close to the midline, I will thump thump all the way down the lane regardless of weight hole.
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"Why don't you call me sometime.....when you have no class" ~~Rodney Dangerfield to Sally Kellerman, his college professor in Back to School ~~1986

Mike Craig - Storm Products Pro Shop staff -Columbus, OH

What are your pap coordinates?
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the pooh

I am at a loss to figure out your problem. if a ball thumps when it leaves your hand, it is the thumb. if it thumps 15-20'''' down the lane, it should be the finger(middle). With your pap, you must have little to no tilt in order to track that close to the holes. It''''s almost as if you throw a full roller that tracks outside the holes. Have you measured your track circumference? also, neither your pin or mass bias are more than 6 3/4" from your pap, are they? This would cause reverse flare and would explain the situation.You might try cocking your wrist more to the left and coming around the ball more at release to get the track away from the holes.
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the pooh

Edited on 11/20/2009 11:00 AM

Edited on 11/20/2009 11:02 AM

Thanks everybody for your thoughts.  I e-mailed another driller friend, and asked him.  Below was his response:

"BALL
wrong pin placement
ball weighted with negative or thumb weight or both
ball weighted with bottom weight along with negative and thumb weight
high friction ball surface makes the ball stand up as soon as it hits the alley."

I did not weigh the top weight on this ball before I drilled it.  The box must have been mislabeled, when drilled it was negative 2+ ozs and with the dual thumb layout and the aggressive surface, this ball tracked over the thumb.  

I have plugged the X hole.  Redrilled it +1 inch above the midline, about 10" towards the bottom of the ball with an 1 1/8 inch hole, 3 " deep, about 1 1/2" from the track on the bottom of the ball.  Similar to high flair X hole layout in the Brunsnick video.  

Problem solved.


Tom