How should I figure out what motors I need to spin this ball?

I have a machine with 3 wheels 120 degrees apart from eachother, basically making an equilateral triangle. when this machine runs you put a baseall on top of these 3 wheels, and the wheels spin in certain ways to make the ball rotate in 3 different directions. Right now I have 3 very strong motors connected to these wheels that spin the ball. I am now trying to make a prototype that will be economical and need to figure out how strong these motors need to be at minimum. How should I figure this out. Is there some calculations I can do or, is it just going to be trial and error?

Answer:
*Trial and error is a best solution,because you are more nearer to the machine.Have a brain storming session with ur sub-ordinates who are also close to it.Definitely you will get a solution.
*Spin bowling
To achieve spin, the machine should be tilted to one side, and the wheels set to different speeds as per swing bowling. It will also probably be necessary to make the machine bowl significantly more slowly. The combined action of the spin imparted by the wheels, and the non-perpendicular axis of that spin will cause the ball to bounce up at an angle.

For more, please click on:
http://en.wikipedia.org/wiki/bowling_mac...

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How should I figure out what motors I need to spin this ball?

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