How does a TT robot work?

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May 2022
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I'm building a 3d printed table tennis robot, with 3 wheels, it is almost complete, but I'm struggling with backspin, I don't know how wheels to rotate, also how to get a slow and spinny shot, or fast and spinny, btw: the robot wheels are able to rotate clockwise and counter clockwise.

I'm using hard sponge RC plane wheels, but the suffer for plastic deformation and shots aren't as reliable a I wish, please tell me which one will work, on a budget.

Thanks!

Edit: also I'm wondering how close wheels has to be to the ball.
 
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