On 10 Jun 2005 15:34:04 -0700, 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

Just found this site, lots of documentation and photos.

http://www.ece.uvic.ca/499/2003b/group09/balltoss.html