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Unread 29-01-2010, 13:21
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Mike Betts Mike Betts is offline
Electrical Engineer
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Team Role: Engineer
 
Join Date: Dec 2001
Rookie Year: 1995
Location: Homosassa, FL
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Re: Dangers of High Speed Pneumatic Gun

Daniel,

You are correct... We have always used cylinders with 1/8" NPT ports before... And many valves usually don't have NPT fittings. I wonder if this isn't a typo...

Mike


Eric,

You are correct about requesting re-inspection.

About maximum safe speed, I'm thinking that <R94> applies here...

Any metal will fatigue and break if you hit it hard enough. There is no use in me questioning the 20"/s figure as a team can use any manufacturer.

If the team employs a precharged piston, venting to atmosphere without going through a valve with a very large cylinder port, the impact of the piston against the end of the cylinder housing could be very great indeed.

Since I can't make an engineering decision a priori, I'd put the burden of proof for a safe design on the team via <R94>...

Mike
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Mike Betts

Alumnus, Team 3518, Panthrobots, 2011
Alumnus, Team 177, Bobcat Robotics, 1995 - 2010
LRI, Connecticut Regional, 2007-2010
LRI, WPI Regional, 2009 - 2010
RI, South Florida Regional, 2012 - 2013

As easy as 355/113...