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Unread 27-12-2015, 10:41
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ScandallB225 ScandallB225 is offline
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AKA: Randall Bryan
FRC #0225 (TechFire Robotics of York, PA)
Team Role: Mentor
 
Join Date: Dec 2014
Rookie Year: 2012
Location: Glen Rock, PA
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Talking Re: A small pneumatics spreadsheet

Great information.

Quote:
Originally Posted by WorldShaper View Post
While the old sheet assumed that you had taken the volume of the tubing into account (or were at least comfortable with ignoring it), the new sheet has the option to include a specific quantity for it, based on the tubing's inner diameter and the length of tubing.
From my limited experience, the shaft volume is not insignificant for most FRC applications. We have found that the smaller the cylinder the more significant it becomes.

Quote:
Originally Posted by WorldShaper View Post
The middle complexity sheet only assess air balance, and so never shuts off the compressor. The assumption therein is that t=0 is the first actuation and that the pressure never returns to the maximum storage pressure, which at least in my team's history, is par for a match. That said, the more complex sheet does shut off the compressor when the maximum storage pressure is attained.
Again from limited experience, over the past two years we have trimmed weight to maximize onboard storage and still run below 60 psi with the compressor running full time.
The two years prior the compressor was on for short bursts at a time. So, both situations are good to have accounted for.

Did I mention, thank you for tabulating this for us?