24-02-2014, 13:43
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no bag, vex only, final destination
AKA: Pinecone
 FRC #0228 (GUS Robotics); FRC #2170 (Titanium Tomahawks) Team Role: Mentor
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Join Date: Dec 2008
Rookie Year: 2006
Location: Glastonbury, CT
Posts: 7,675
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Re: Reducing Friction in Shooter
All things considered, if you only need 14 pounds to release your mechanism you're in good shape. The 3/4" bore piston at 60 PSI pushes with 26.5 lbs of force. It pulls with somewhat less force since the piston rod takes away some surface area.
Are you having trouble shifting the piston under load? Does it take too long? An easy fix would be moving the gear to the end of the shifter so that you push to shift to neutral. If you still need more force, it is possible to get creative and mount a bigger piston to the mechanism, but be warned that the Vex shifter components (bearing and e-clips) cannot handle a ton more than 30 pounds of force.
One last thing: are you sure it's the gearbox that's slowing you down?
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Mentor / Drive Coach: 228 (2016-?)
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College Mentor: 2791 (2010-2015)
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...2012 BAE Imagery / Finalists (with 1519, 885), CT Xerox Creativity / SFs (with 2168, 118)
Student: 1714 (2009) - 2009 Minnesota 10,000 Lakes Regional Winners (with 2826, 2470)
2791 Build Season Photo Gallery - Look here for mechanism photos My Robotics Blog (Updated April 11 2014)
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Teams that TRY to win and TRY to do their best end up having students that learn more, learn the value of hard work, and are inspired by the process. - Chris Hibner [more] 
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