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okay so I’m trying to build a tennis ball launcher for my school so we can showcase it- my teacher helped me get motors and stuff setup similar to this image.

Question: How would I include a spring so that (after we manually compress it) anyone can use a button or something to release the spring and push the ball towards the wheels please? I can’t find anything simple? ![enter image description here]![enter image description here]enter image description here

I was thinking of having a bung or something at the end of the spring??

Edwin
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Why do you need a spring?

Have a vertical tube with a gentle curve to feed the balls and all you need is a small pin to stop the balls getting to the drive mechanism. The mass of the balls will autofeed...

Or you can make a "gate" to allow one at a time... Perhaps think of a pinball machine.

So, how about two pins which need to be linked together. As one moves out to allow the ball to get to the drive wheels, the other moves in to prevent "full auto"...

enter image description here

Solar Mike
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Another idea just for the sake of fun.

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Suggested locking mechanism.

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Crossectional View

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r13
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