Go to Post There can be only one.... - Koko Ed [more]
Home
Go Back   Chief Delphi > Technical > Pneumatics
CD-Media   CD-Spy  
portal register members calendar search Today's Posts Mark Forums Read FAQ rules

 
 
 
Thread Tools Rate Thread Display Modes
Prev Previous Post   Next Post Next
  #1   Spotlight this post!  
Unread 29-01-2008, 23:46
Tytus Gerrish's Avatar
Tytus Gerrish Tytus Gerrish is offline
IGAB, ADHD, and Dislexic
AKA: Ty
FRC #0179 (SwampThing)
Team Role: Tactician
 
Join Date: Feb 2003
Rookie Year: 2001
Location: West Palm Beach, Florida
Posts: 2,017
Tytus Gerrish has a reputation beyond reputeTytus Gerrish has a reputation beyond reputeTytus Gerrish has a reputation beyond reputeTytus Gerrish has a reputation beyond reputeTytus Gerrish has a reputation beyond reputeTytus Gerrish has a reputation beyond reputeTytus Gerrish has a reputation beyond reputeTytus Gerrish has a reputation beyond reputeTytus Gerrish has a reputation beyond reputeTytus Gerrish has a reputation beyond reputeTytus Gerrish has a reputation beyond repute
Legality of pnumatic ball launcher systems

I've been reading about the different ways to create devices based on pneumatic cylinders to launch the ball. i would like to explore a few of the methods and rules and question what first is going to say about some the pneumatic rules issues

First i would like to question the use of pneumatic cylinders as Gas springs witch are allowed by R87. this means plugging an end of a pneumatic cylinder and using the trapped air as a working gas. and by some means cocking this mechanism either by a winching it in with a motor, or manually cocking the device by hand before a match.

Quote:
 <R87> .For the purposes of the FIRST competition, closed-loop pneumatic (gas) shocks are not considered pneumatic devices, and are permitted additions to the ROBOT.
the question here is do you consider a pneumatic piston with an end plugged a gas spring?

if the device described above is considered a pneumatic component then the cocking action of this device would be compressing air and is therefore in violation of R93

Quote:
<R93> Compressed air for the pneumatic system on the ROBOT must be provided by the Thomas Industries compressor provided in the 2008 Kit Of Parts. Compressed air shall not come from any other source.
Also a device like this could be capable of generating more than 60psi witch would be a violation of R98 but only if you considered that sealed in air as "working" air pressure. perhaps this should be elaborated on further

however if this device is cocked by pressurizing the opposing side of the cylinder to a greater pressure with your pneumatic system, then venting that pressure to release the device. Is this trapped air considered part of the “Working” air pressure described in R89?

Quote:
<R98> “Working” air pressure on the ROBOT must be no greater than 60psi. All working air must be provided through the Norgen adjustable pressure regulator, and all other pneumatic components must be downstream from this regulator. A pressure gauge must be placed adjacent to the pressure regulator and display the downstream pressure.
this is one of the reasons that the regulator provided in the kit is required. it is designed to vent gas to the atmosphere when the working side exceeds the set value

additionally if this device were considered a pneumatic component it would need all the Required equipment dump valve, pressure gauge, etc...

i suppose if a cylinder were plunged in the opposite fashion in order to pull a vacuum while cocked, this would not apply to R93 as pneumatic pressure is not being generated, rather a vacuum is being pulled in the empty space and then the device is allowed due to R87

Quote:
<R87> For the purposes of the FIRST competition, a device that creates a vacuum is not considered to be a pneumatic device and is allowed. This includes, but is not limited to, venturi-type vacuum generators and off-the-shelf vacuum devices (as long as they are powered by provided or permitted motors).
no matter the ruling i above all concerned with safety and then secondly with teams allowance to accomplish what they desired for their machines. I always Hate sending teams away from the inspection table with the mandate "make your robot legal so you can play"

Last edited by Tytus Gerrish : 29-01-2008 at 23:51. Reason: spelling
 


Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Ball Launcher Joe_Widen Kit & Additional Hardware 15 06-03-2006 02:59
Ball Feeding Tube Legality phrontist Rules/Strategy 4 13-02-2006 22:30
612's ball launcher - prototype jskene Robot Showcase 8 05-02-2006 11:22
1266's Ball Launcher prototype! NiGhtMarE_AnGeL Robot Showcase 16 30-01-2006 19:55
Legality of Blocking Ball Chutes Aignam Rules/Strategy 29 12-01-2004 14:32


All times are GMT -5. The time now is 23:26.

The Chief Delphi Forums are sponsored by Innovation First International, Inc.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright © Chief Delphi