OCCRA
Go to Post Everybody "cares about the robots" - otherwise we'd be doing science fairs. - Taylor [more]
Home
Go Back   Chief Delphi > ChiefDelphi.com Website > Extra Discussion
CD-Events   CD-Media   CD-Spy   FRC-Spy  
portal register members calendar search Today's Posts Mark Forums Read FAQ rules

 
Reply
Thread Tools Rate Thread Display Modes
  #1   Spotlight this post!  
Unread 04-24-2012, 11:49 AM
~Cory~'s Avatar
~Cory~ ~Cory~ is offline
Intern - EmbedTek
AKA: Cory Rypkema
FRC #0706
Team Role: Alumni
 
Join Date: Jan 2010
Rookie Year: 2010
Location: Worcester MA
Posts: 213
~Cory~ is a splendid one to behold~Cory~ is a splendid one to behold~Cory~ is a splendid one to behold~Cory~ is a splendid one to behold~Cory~ is a splendid one to behold~Cory~ is a splendid one to behold~Cory~ is a splendid one to behold
pic: T-Shirt Canon Frenzy [706]

Reply With Quote
  #2   Spotlight this post!  
Unread 04-24-2012, 11:51 AM
docdavies's Avatar
docdavies docdavies is offline
Doc Davies
FRC #0346 (RoboHawks)
Team Role: Mentor
 
Join Date: Mar 2010
Rookie Year: 1998
Location: Richmond, VA
Posts: 66
docdavies is an unknown quantity at this point
Send a message via Skype™ to docdavies
Re: pic: T-Shirt Canon Frenzy [706]

Cory,

We've been designing T-Shirt Canon's for a while but have been singularly unsuccessful at getting permission to build one from the school or school district we are affiliated with.

How did you folks go through the process of obtaining permission to build and then demonstrate your shooter at school events?

Doc
Reply With Quote
  #3   Spotlight this post!  
Unread 04-24-2012, 07:43 PM
jason701802's Avatar
jason701802 jason701802 is offline
Registered User
FRC #0753 (The High Desert Droids)
Team Role: College Student
 
Join Date: Jan 2007
Rookie Year: 2002
Location: Oregon/Univ. of Southern Calif.
Posts: 234
jason701802 has a brilliant futurejason701802 has a brilliant futurejason701802 has a brilliant futurejason701802 has a brilliant futurejason701802 has a brilliant futurejason701802 has a brilliant futurejason701802 has a brilliant futurejason701802 has a brilliant futurejason701802 has a brilliant futurejason701802 has a brilliant futurejason701802 has a brilliant future
Re: pic: T-Shirt Canon Frenzy [706]

Is that PVC? If so I would recommend immediately decommissioning that cannon and rebuilding it with pressure-rated ABS or metal. PVC is pressure rated for liquids, not gases. When PVC fails, it shatters, which, when filled with air sends sharp shrapnel flying. This shrapnel can easily blind or otherwise seriously injure someone. The question with PVC, as with any material, is not if it will fail but when it will fail. It might last 10 years or it might last a month. With pressure-rated ABS or metal, the risk of failure is only slightly small, but the risk of injury when said failure occurs is orders of magnitude smaller. The risk of failure is very small, but the risk or seriously injuring someone is just to great.


Quote:
Originally Posted by docdavies View Post
Cory,

We've been designing T-Shirt Canon's for a while but have been singularly unsuccessful at getting permission to build one from the school or school district we are affiliated with.

How did you folks go through the process of obtaining permission to build and then demonstrate your shooter at school events?

Doc
We just built one (over the summer, in a student's family owned shop), then went to the administration and asked if we could use it a an assembly and at football games.
__________________
Jason

Last edited by jason701802 : 04-24-2012 at 07:47 PM.
Reply With Quote
  #4   Spotlight this post!  
Unread 04-24-2012, 08:54 PM
Phyrxes's Avatar
Phyrxes Phyrxes is offline
Has done the math, have you?
AKA: Dave Button
no team (No Team, Changed Schools)
Team Role: Teacher
 
Join Date: Dec 2007
Rookie Year: 2007
Location: Gainesville VA
Posts: 489
Phyrxes has a brilliant futurePhyrxes has a brilliant futurePhyrxes has a brilliant futurePhyrxes has a brilliant futurePhyrxes has a brilliant futurePhyrxes has a brilliant futurePhyrxes has a brilliant futurePhyrxes has a brilliant futurePhyrxes has a brilliant futurePhyrxes has a brilliant futurePhyrxes has a brilliant future
Re: pic: T-Shirt Canon Frenzy [706]

To get permission to build and use ours we had to get the okay from not only the building principal but also "Risk Management" or what ever your school division calls the department that handles safety and security.

We made sure that our plans and materials usage met or exceeded OSHA specifications for containing compressed gasses.

Everything that contains pressurized gas is either commercially produced and rated to a pressure far exceeding what we are putting it or is soldered metal pipe. The only plastic pipe we ended up using was the barrel.
__________________
Dave Button
Physics and Mathematics Teacher
Wakefield School
The Plains, VA

“Simplify and add lightness.”
― Colin Chapman, Team Lotus
Reply With Quote
  #5   Spotlight this post!  
Unread 04-24-2012, 11:56 PM
~Cory~'s Avatar
~Cory~ ~Cory~ is offline
Intern - EmbedTek
AKA: Cory Rypkema
FRC #0706
Team Role: Alumni
 
Join Date: Jan 2010
Rookie Year: 2010
Location: Worcester MA
Posts: 213
~Cory~ is a splendid one to behold~Cory~ is a splendid one to behold~Cory~ is a splendid one to behold~Cory~ is a splendid one to behold~Cory~ is a splendid one to behold~Cory~ is a splendid one to behold~Cory~ is a splendid one to behold
Re: pic: T-Shirt Canon Frenzy [706]

Quote:
Originally Posted by jason701802 View Post
Is that PVC? If so I would recommend immediately decommissioning that cannon and rebuilding it with pressure-rated ABS or metal. PVC is pressure rated for liquids, not gases. When PVC fails, it shatters, which, when filled with air sends sharp shrapnel flying. This shrapnel can easily blind or otherwise seriously injure someone. The question with PVC, as with any material, is not if it will fail but when it will fail. It might last 10 years or it might last a month. With pressure-rated ABS or metal, the risk of failure is only slightly small, but the risk of injury when said failure occurs is orders of magnitude smaller. The risk of failure is very small, but the risk or seriously injuring someone is just to great.

Yes the material you see is PVC and ABS plastic. However, all parts that will come under high pressure are metal. The secondary storage tank is reinforced with metal. The rest of the valves and such are either metal or standard pneumatic parts. The revolver and barrel are made out of PVC but serve only to guide the t-shirt. Any unsafe build up in pressure would be vented out the back of the revolver against the spring seal (which is very easy to move) or the other pressure relief valve. Mentors looked very carefully and verified the design and materials (Our main sponsor Price Eng. is a specialist in Pneumatics, qualified GE mentors and the legendary Mr. Borchardt (Bruceb) ) so I feel very safe. There is another topic dedicated to the controversy over our materials choices

We have since made changes. This was a prototype


As for the school: As I understand (we have been working on this a while before my rookie year) we built it with out asking. Then after we put it together, we talked to administration and the sporting event staff (and coaches) along with janitorial staff for input. We make sure to completely honor the wishes of everyone at the events to make sure we are continued to be invited. The treads were made to be scratch resistant (again plastic) to the floor. At sporting events we dial in the pressure before the event starts to a safe level. Also, our school police officer is very interested in robots so he helps us out. (Sadly the mentors don't like to come to Friday night football/basketball games). The robot receives a lot of attention so the administration seem to be fine with it. The situation may also be determined from your relationship with the school. Our relation ship is actually quite bad and face a lot of challenges but finding a friend in the higher ranks is a major boost. It has been a challenge but we are slowly chipping away at the goal.


We recently partnered with the DEKA club to incorporate it into their multiple fundraisers. It has been a real success and you may wish to look for support from another club to help sway the administers...
__________________
corin.rypkema.org
WPI Class of '17
Mentor, LCS and Erin FLL
'11-'13 Captain, Cyberhawks 706
'13 Buckeye Finalist
'12 Dean's List Finalist
'10 Wisconsin Finalists and Design in Innovation winner
Reply With Quote
Reply


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


All times are GMT -5. The time now is 03:39 PM.

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


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright © Chief Delphi