Thread: Solenoids
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Unread 23-06-2002, 23:47
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#0047 (ChiefDelphi)
  
Join Date: May 2001
Location: Pontiac, MI
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single acting valves -- FIRST, you're scaring me...
Posted by Joe Johnson at 1/29/2001 2:31 PM EST


Engineer on team #47, Chief Delphi, from Pontiac Central High School and Delphi Automotive Systems.


In Reply to: Single and double solenoids... here's the difference:
Posted by Andy Baker on 1/29/2001 1:12 AM EST:



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

I know I am.

Think about it, teams that use the single acting valves will have to have the "disabled" state be the state that puts the robots "in the box."

This is by no means is the "safe" position.

Consider the following:

Robot is enabled running about doing its thing. Someone foolishly puts a part of their body near the robot. A careful drive, seeing this condition hits the "STOP" button trying to prevent anything bad from happening to the person (fingers in gears for example).

What happens? Well... what might happen is the robot will revert to its "in the box" state and happily provide 100+ of force to the arm or what ever. If the person's body part is in the way, well, too bad for that body part.

Here is my nightmare scenario:

Step #1:
Same as above but someone does not hit the button until the said body part is actually caught in the gears of the machine.

Step #2:
The foolish person screams, "HIT THE STOP BUTTON!"
Step #3:
The drives hit the "STOP" button

Step #4:
The foolish person yell, "TURN IT BACK ON! TURN IT BACK ON!" because an air cylinder is putting the hurt on him.

Step #5:
Return to Step #2 -- repeat until foolish person passes out or until the batteries are drained.

Do I just have an overactive imagination or is this a realistic possibility?

Thoughts, comments?

Joe J.


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