Thread: Solenoids
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Unread 23-06-2002, 23:47
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#0047 (ChiefDelphi)
  
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Re: single acting valves -- FIRST, you're scaring me...
Posted by ChrisH at 1/29/2001 5:09 PM EST


Engineer on team #330, Beach 'Bots, from Hope Chapel Academy and NASA JPL, J & F Machine, Raytheon, et al.


In Reply to: single acting valves -- FIRST, you're scaring me...
Posted by Joe Johnson on 1/29/2001 2:31 PM EST:



: Is anybody else worried that the "STOP" button may actually make some robots move violently?


Joe,

You are right to be concerned. However there is a solution right in the box with the other pnuematic stuff. It's called a pilot operated check valve. Used properly it will cause a single solenoid valve to act like a double. As I recall there are two of them. I learned about this at a seminar held by Team 22 HOMER last weekend, but it's also in the manual (which somebody had borrowed or I would have read it before)

The setup we got this year is powerful enough to hurt people badly if not used with care, but the same could be said of the battery we use, or the motors, or surgical tubing for that matter.

I highly recommend that any pnuematic setup be "breadboarded" and tested before installation on the robot. This will help find unexpected operating modes (ie. "bugs" or "features" to you software guys and gals). In aircraft-land we actually mock up the entire hydraulic set-up of a new aircraft on a big steel frame called the "iron bird". The Iron Bird "flies" many hundreds of hours before the "real" airplane gets air under the tires once. The whole purpose is to find out if the system does anything unexpected. If the big boys that do it for money spend time on it maybe you should too!

With pnuematics as with any other power source, use it responsibly! AND READ THE MANUAL FIRST!!!!

Chris Husmann, PE
team 330 the Beach'Bots





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