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Unread 16-01-2006, 23:23
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Re: pneumatic launch velocity

Quote:
Originally Posted by Arkorobotics
Ahhh! what if you were to take that 1" stroke piston 2" diameter and fire it directly to the ball. Would that be enough to fire it to the center goal??
This is going to be honestly more of a hunch, so your mileage may vary*, but I'm going to say outright that I think there will be some velocity damping going on in these cylinders, and I'll venture to say that there just won't be a 12 m/s end velocity on these cylinders. Someone can feel free to do the math, but accelerating to 12 m/s in 1 inch...

Oh sheesh, I'll do the math

v^2 = 2 * a * d

(12 m/s) ^ 2 / (2 * 1in / 39.37in/m) = a

a = 2834.6 m/s^2

so... 1/2 * a * t^2 = d

t = sqrt ( (1/39.37) * 2 / 2834.6)

t = 0.004 seconds.

I'll say (from experience) I haven't seen pneumatics move 1 inch in 4 milliseconds. I think there's a lot of time required to have adequate airflow from the tanks to the piston, and like I alluded to before, I really think there are vicious damping issues that arise.

Hence, it's my personal recommendation that you do not count on having a directly driven ball launcher using a pneumatic cylinder. However, I feel pretty confident that you could come up with something with some mechanical advantage ideas that was previously mentioned.

Matt

* an admittedly stolen disclaimer of Dr. Joe. Imitation is the greatest form of flattery.
 


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