Go to Post Ask the right questions and you can get the right answers. - Chief Hedgehog [more]
Home
Go Back   Chief Delphi > FIRST > Robot Showcase
CD-Media   CD-Spy  
portal register members calendar search Today's Posts Mark Forums Read FAQ rules

 
Closed Thread
Thread Tools Rate Thread Display Modes
  #61   Spotlight this post!  
Unread 06-08-2010, 13:54
will_1359 will_1359 is offline
Registered User
FRC #1359
 
Join Date: Jan 2010
Location: lebanon
Posts: 15
will_1359 is an unknown quantity at this point
Re: Most Powerful FIRST Team created T-Shirt Cannon

so, i'll have to finish my wireless robot-human are system to safely work on this.... oh well, i'll be wearing my safty goggles and cup, and not standing behind it,
  #62   Spotlight this post!  
Unread 06-08-2010, 15:11
JamesCH95's Avatar
JamesCH95 JamesCH95 is offline
Hardcore Dork
AKA: JCH
FRC #0095 (The Grasshoppers)
Team Role: Engineer
 
Join Date: Dec 2004
Rookie Year: 2001
Location: Enfield, NH
Posts: 1,891
JamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond repute
Re: Most Powerful FIRST Team created T-Shirt Cannon

Worry a lot about hearing damage, sound is waves of air pressure, and you've got a lot of air pressure. An engineer I knew at a local research lab developed PTSD after an experimental fixture failed while storing a couple cubic feet of ~100psi air.
__________________
Theory is a nice place, I'd like to go there one day, I hear everything works there.

Maturity is knowing you were an idiot, common sense is trying to not be an idiot, wisdom is knowing that you will still be an idiot.
  #63   Spotlight this post!  
Unread 06-08-2010, 17:30
will_1359 will_1359 is offline
Registered User
FRC #1359
 
Join Date: Jan 2010
Location: lebanon
Posts: 15
will_1359 is an unknown quantity at this point
Re: Most Powerful FIRST Team created T-Shirt Cannon

when we fire ours it's most of the time at 80psi, the 125psi was just a test, and when we fire shirts at crowds it will be down to about 40-60 psi.

P.S. sorry for hijacking the thread lol.

you might be able to see this video
http://www.facebook.com/#!/video/vid...25764667445518

Last edited by will_1359 : 06-08-2010 at 17:42. Reason: posting video
  #64   Spotlight this post!  
Unread 10-08-2010, 13:59
JesseK's Avatar
JesseK JesseK is offline
Expert Flybot Crasher
FRC #1885 (ILITE)
Team Role: Mentor
 
Join Date: Mar 2007
Rookie Year: 2005
Location: Reston, VA
Posts: 3,722
JesseK has a reputation beyond reputeJesseK has a reputation beyond reputeJesseK has a reputation beyond reputeJesseK has a reputation beyond reputeJesseK has a reputation beyond reputeJesseK has a reputation beyond reputeJesseK has a reputation beyond reputeJesseK has a reputation beyond reputeJesseK has a reputation beyond reputeJesseK has a reputation beyond reputeJesseK has a reputation beyond repute
Re: Most Powerful FIRST Team created T-Shirt Cannon

T-shirt cannons are a fun topic in general; looks like we may have some cannon fodder for the Mythbusters to test!
__________________

Drive Coach, 1885 (2007-present)
CAD Library Updated 5/1/16 - 2016 Curie/Carver Industrial Design Winner
GitHub
  #65   Spotlight this post!  
Unread 10-08-2010, 14:58
JamesCH95's Avatar
JamesCH95 JamesCH95 is offline
Hardcore Dork
AKA: JCH
FRC #0095 (The Grasshoppers)
Team Role: Engineer
 
Join Date: Dec 2004
Rookie Year: 2001
Location: Enfield, NH
Posts: 1,891
JamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond repute
Re: Most Powerful FIRST Team created T-Shirt Cannon

Yes they are. I had several in high-school, including a propane powered one. I feel the fuel-powered cannons are safer because the cannon is not sitting at full pressure with any small cracks continuously growing waiting for failure. Instead the pressure is applied rapidly, where the high strain rate tends to result in higher material strengths, and the pressure is prevented from building to critical levels because the projectile is already flying out and there are inevitably leaks around the ignition source and the threaded-on end cap.

I also found that one only needs a small combustion chamber, my best one was 1ft of 4" pipe, it could utilize the full length of a 10ftx2in barrel.

The only failure I've ever experienced with a pvc cannon was the pneumatic one.
__________________
Theory is a nice place, I'd like to go there one day, I hear everything works there.

Maturity is knowing you were an idiot, common sense is trying to not be an idiot, wisdom is knowing that you will still be an idiot.
  #66   Spotlight this post!  
Unread 27-10-2010, 15:38
joek's Avatar
joek joek is offline
Team Welder and CAD tech
FRC #2052 (KnightKrawler)
Team Role: Mechanical
 
Join Date: Jan 2009
Rookie Year: 2009
Location: Irondale H.S.
Posts: 231
joek is an unknown quantity at this point
Re: Most Powerful FIRST Team created T-Shirt Cannon

a 5-gal 150 psi rated air tank is like $30 at northern tool
it's what we use for ours, and you only want to go to 60 psi, otherwise the shirts go too far
__________________


2012 Record (13-2-0)
lake superior regional finalists- thank you WAVE (2826) and Blue Twilight (2220)

Last edited by joek : 27-10-2010 at 15:46.
Closed Thread


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
pic: TEAM 343's t-shirt cannon Josh Drake Extra Discussion 14 20-04-2009 18:58
IRI T-shirt cannon Kyle Love Off-Season Events 6 17-07-2007 12:09
Too Powerful cannon? I Eat Robots829 Chit-Chat 15 03-02-2006 00:19
What is the most benefitial technological advance ever created? Koko Ed Math and Science 28 05-05-2005 22:52
What is the most obscure technological advance ever created? Allison K Math and Science 4 30-04-2005 15:09


All times are GMT -5. The time now is 23:43.

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