Re: Pneumatics v. Motor
 

yea that was the problem , we got a lot of power (35-40 feet) but it was pulled back with human power::ouch::

Re: Pneumatics v. Motor
 

We are doing a CIM winder at a geardown to get about 12-15 RPM. Our winder winds up kevlar cable stretching a PRE-TENSIONED bungee group for ~12" of cable wrap to raise tension up from ~50lbs pull to about ~100 lbs pull during the wind cycle. With our winder design, a full kick wind is 180 degrees and torque at end of wind drops to near zero making triggering easier. We have a way to disengage cable from winder to allow instant cable snap back of the ~12" wind, thus delivering a force that starts at ~100 lbs and drops down to ~75lbs during the arc of the kicker 's swing when it is contacting the ball. The only mass being accelerated is the kicker, cable and bungee The rapid acceleration we get, by delivering virtually all of wind energy only to the kicker, allows use of a smaller and lower mass kicker.
With our trigger release design, as soon as 90 or 180 degree shot is released our winder is already in position for re-applying tension needed for next shot. Our winder release scheme also lets us fire at any point from 0-180 degrees during the wind up cycle, allowing us variable force release for shorter shots.

Google & read about the "mantis shrimp" mechanism for cracking snail shells by concentrating force at levels exceeding what a 22 caliber bullet can deliver. Absolutely amazing stuff!

-RRLedford

Re: Pneumatics v. Motor
 

Pictures? Please?

:)

Re: Pneumatics v. Motor
 

I don't have pictures of their robot, but I found this neat video on the mantis shrimp.

Re: Pneumatics v. Motor
 

Is This the video?

http://dotsub.com/view/39e3b18e-62d5...6-32d14121f570

the web site you posted won't load the video