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Author Topic: How does the factory find the cg?  (Read 1764 times)

Moon57

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How does the factory find the cg?
« on: May 31, 2008, 10:12:23 PM »
I am curious about the method or methods that the ball manufacturers use to locate the cg. If anybody has info on this could you share it please. Thanks.
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Moon
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So many questions, so little time but I''m having fun.
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ibowled286

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Re: How does the factory find the cg?
« Reply #1 on: June 01, 2008, 07:27:08 AM »
I could be wrong, but I thought that it was a machine that spins the ball till it balances out.  basically the same kind of thing that they use to balance your tires.  It's not perfectly exact but usually very close.
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Moon57

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Re: How does the factory find the cg?
« Reply #2 on: June 01, 2008, 11:01:42 PM »
Thanks for the replies. I could see both methods working but it would seem like the machine spinner would be quicker and you wouldn't have to scale the ball after to tell the amount of topweight.
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Moon
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So many questions, so little time but I'm having fun.
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dizzyfugu

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Re: How does the factory find the cg?
« Reply #3 on: June 02, 2008, 08:56:20 AM »
I have seen a production documentation from ABS in Japan, and if I remember correctly, they used an air cushion device that would have the ball float, stabilize at its CG and the it would get a punch mark at the respective place.
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Moon57

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Re: How does the factory find the cg?
« Reply #4 on: June 02, 2008, 01:51:53 PM »
Air would be better than water because of the cleanup, etc. But it would seem that with both the water and air methods the ball would have to be scaled afterwards to determine the amount of the topweight.
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Moon
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So many questions, so little time but I'm having fun.
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taylorsproshop

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Re: How does the factory find the cg?
« Reply #5 on: June 02, 2008, 02:00:43 PM »
The method i've seen had the ball placed into a half ball mould which was constructed of metal and perforated with many holes. Compressed air was then passed through the half ball mould which in turn made the ball float. Quite cool to see, a ball just floating. The ball would stabilize then have a punch mark put into the ball.
This method didn't find the top weight and cg in one step. The ball thereafter had to be weighed accordingly.
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