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wrote:

The dog would play fetch all day if us humans
didn't get tired of throwing it.

I want to build an automatic thrower. Train
the dog to drop the ball in a 'hopper', the
machine waits 10 seconds, beeps, and throws
the ball.

I am looking for ideas on the mechanical
throwing mechanism.

Rich

You may find the dog getting bored with a mechanical play-toy instead of
a human.

But do let us know how it turns out.

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Tim Wescott
Wescott Design Services
http://www.wescottdesign.com