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Unread 21-03-2014, 14:38
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hrench hrench is offline
Mechanical build mentor
AKA: Bob Hrenchir
FRC #1108 (Panther Robotics)
Team Role: Mentor
 
Join Date: Jan 2012
Rookie Year: 2010
Location: Paola, KS
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Re: Pistons not extending fast enough?

Quote:
Originally Posted by Oblarg View Post
This is fundamentally not true. You might not be able to score from 18 feet out with a single solenoid, but 449 has a shooter which scores consistently in the high goal using two 1.5''-bore, 8''-stroke cylinders off of one solenoid with no downstream tanks, and no latch. It's all about the geometry if you're going to go that route, though; it's subtle.
Geometry is right, but there is also another trick you can use. If you use a longer-stroke cylinder (we use 11") and don't retract it all of the way, you'll have a volume chamber right in the cylinder you can fill to 60 psi before you release. Also, yes, the other side of the cylinder should be open to atm.


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