Author Topic: Is this possible? (Read 4531 times)

Moon57 · « **on:** May 30, 2008, 09:41:39 PM »

Got my x-blem Cell yesterday. Box is marked .63 topweight, cg is 2" to the right of the pin-mb line. Start checking the cg on my digital homebrew scale and the cg doesn't seem to be in the right spot. Put the ball in the spinner with the cg straight up to check for wobble, spinner shakes pretty good. Keep moving ball around in spinner until the ball is spinning nice smooth and mark the top of the ball. Put the ball back on the scale and now the ball has 1.3 oz of top weight and the cg that I marked is 1 1/2" to the left of the pin-mb line. Is it possible the cg is off by 3 1/2" and the topweight is off by .7oz? I never thought about it before but how is the cg determined at the factory?
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Moon
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So many questions, so little time but I''m having fun.

Moon57 · « **Reply #16 on:** June 02, 2008, 01:47:54 PM »

What I am saying I guess is that the ball is balanced weight wise if the heavy cg and light cg (180 degrees away) axis is perpendicular. If the ball is balanced weight wise on that axis then the core is balanced also. Remember the ball is spinning at a right angle to the cg axis and there are no imparted revs generated by a bowlers release so the coverstock is out of the picture. The ball is not rolling on a surface so friction is not a factor.
I wish a mechanical engineer would jump in here to either agree or disagree. There are concrete laws of physics that govern all this, I just don't know what they are.
BTW, I took my only new, undrilled ball, a Comfort Zone(Zone classic) put it in the spinner with the cg at the top and the ball ran smooth. As soon as I started moving the cg the wobble started.
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Moon
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So many questions, so little time but I'm having fun.

Author Topic: Is this possible? (Read 4531 times)

Moon57

Is this possible?

Moon57

Re: Is this possible?