Go to Post Once you get to college, remember that FRC is not your life anymore (or at least it doesn't have to be). Don't be afraid to try new things, and branch away from the things you swear by in high school - buildmaster5000 [more]
Home
Go Back   Chief Delphi > Competition > Rules/Strategy
CD-Media   CD-Spy  
portal register members calendar search Today's Posts Mark Forums Read FAQ rules

 
Closed Thread
Thread Tools Rating: Thread Rating: 5 votes, 5.00 average. Display Modes
  #16   Spotlight this post!  
Unread 13-02-2015, 17:30
Ether's Avatar
Ether Ether is offline
systems engineer (retired)
no team
 
Join Date: Nov 2009
Rookie Year: 1969
Location: US
Posts: 8,104
Ether has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond repute
Re: Dry Ice as Motor Coolant

Quote:
Originally Posted by techhelpbb View Post
Probably can't stop you from using fully melted dry ice in no container
Physics will stop you from storing "fully melted" (liquid) CO2 in no container.


  #17   Spotlight this post!  
Unread 13-02-2015, 22:44
techhelpbb's Avatar
techhelpbb techhelpbb is offline
Registered User
FRC #0011 (MORT - Team 11)
Team Role: Mentor
 
Join Date: Nov 2010
Rookie Year: 1997
Location: New Jersey
Posts: 1,624
techhelpbb has a reputation beyond reputetechhelpbb has a reputation beyond reputetechhelpbb has a reputation beyond reputetechhelpbb has a reputation beyond reputetechhelpbb has a reputation beyond reputetechhelpbb has a reputation beyond reputetechhelpbb has a reputation beyond reputetechhelpbb has a reputation beyond reputetechhelpbb has a reputation beyond reputetechhelpbb has a reputation beyond reputetechhelpbb has a reputation beyond repute
Re: Dry Ice as Motor Coolant

Quote:
Originally Posted by Ether View Post
Physics will stop you from storing "fully melted" (liquid) CO2 in no container.


Technicality
  #18   Spotlight this post!  
Unread 13-02-2015, 23:59
GeeTwo's Avatar
GeeTwo GeeTwo is offline
Technical Director
AKA: Gus Michel II
FRC #3946 (Tiger Robotics)
Team Role: Mentor
 
Join Date: Jan 2014
Rookie Year: 2013
Location: Slidell, LA
Posts: 3,693
GeeTwo has a reputation beyond reputeGeeTwo has a reputation beyond reputeGeeTwo has a reputation beyond reputeGeeTwo has a reputation beyond reputeGeeTwo has a reputation beyond reputeGeeTwo has a reputation beyond reputeGeeTwo has a reputation beyond reputeGeeTwo has a reputation beyond reputeGeeTwo has a reputation beyond reputeGeeTwo has a reputation beyond reputeGeeTwo has a reputation beyond repute
Re: Dry Ice as Motor Coolant

Quote:
Originally Posted by G25
ROBOTS may not intentionally detach or leave parts on the FIELD.
As I recall, the field is a volume, not a surface, so venting carbon dioxide to the atmosphere would violate G25 as well.
__________________

If you can't find time to do it right, how are you going to find time to do it over?
If you don't pass it on, it never happened.
Robots are great, but inspiration is the reason we're here.
Friends don't let friends use master links.
  #19   Spotlight this post!  
Unread 14-02-2015, 01:14
seg9585's Avatar
seg9585 seg9585 is offline
Registered User
AKA: Eric
FRC #4276 (Surf City Vikings)
Team Role: Engineer
 
Join Date: Feb 2006
Rookie Year: 2001
Location: Boeing (Seal Beach, CA)
Posts: 520
seg9585 has a reputation beyond reputeseg9585 has a reputation beyond reputeseg9585 has a reputation beyond reputeseg9585 has a reputation beyond reputeseg9585 has a reputation beyond reputeseg9585 has a reputation beyond reputeseg9585 has a reputation beyond reputeseg9585 has a reputation beyond reputeseg9585 has a reputation beyond reputeseg9585 has a reputation beyond reputeseg9585 has a reputation beyond repute
Re: Dry Ice as Motor Coolant

Quote:
Originally Posted by GeeTwo View Post
As I recall, the field is a volume, not a surface, so venting carbon dioxide to the atmosphere would violate G25 as well.
Hah. In that case, wouldn't an infinitesimal amount of pneumatics accumulator leakage also break the same rule? We will need to reference the Maxwell-Boltzmann distribution equations to know how quickly G25 becomes violated.
__________________
My FIRST legacy:

Team 204 Student 2001, 2002 (Voorhees, NJ)
Team 1493 College Mentor 2006 - 2008 (Troy, NY)
Team 2150 Intern/Professional Mentor 2007, 2009 (Palos Verdes)
Team 4123 Lead Engineering Mentor 2012 (Bellflower, CA)
Team 4276 Engineering Mentor 2012-2016 (Huntington Beach, CA)
  #20   Spotlight this post!  
Unread 14-02-2015, 01:56
BBray_T1296's Avatar
BBray_T1296 BBray_T1296 is offline
I am Dave! Yognaut
AKA: Brian Bray
FRC #1296 (Full Metal Jackets)
Team Role: Mentor
 
Join Date: Jan 2011
Rookie Year: 2010
Location: Rockwall, TX
Posts: 947
BBray_T1296 has a reputation beyond reputeBBray_T1296 has a reputation beyond reputeBBray_T1296 has a reputation beyond reputeBBray_T1296 has a reputation beyond reputeBBray_T1296 has a reputation beyond reputeBBray_T1296 has a reputation beyond reputeBBray_T1296 has a reputation beyond reputeBBray_T1296 has a reputation beyond reputeBBray_T1296 has a reputation beyond reputeBBray_T1296 has a reputation beyond reputeBBray_T1296 has a reputation beyond repute
Re: Dry Ice as Motor Coolant

Quote:
Originally Posted by alicen View Post
It's dangerous, technically a hazardous material, and has potential for leakage or spilling, thus causing damage to the field or other robots.
I understand the whole argument that dry ice could be considered a hazard to humans, but out of curiosity I am interested in how you think any amount of dry ice (let's be reasonable) could cause damage to the field or other robots.

I feel like dumping air from the pneumatic system is more dangerous to a robot simply from the moisture condensate in the tanks


By the way, at any standard temperature for a robotics venue, dry ice does not melt, but sublimes
__________________
If molecular reactions are deterministic, are all universes identical?

RIP David Shafer: you will be missed


  #21   Spotlight this post!  
Unread 14-02-2015, 09:11
Kevin Sevcik's Avatar
Kevin Sevcik Kevin Sevcik is offline
(Insert witty comment here)
FRC #0057 (The Leopards)
Team Role: Mentor
 
Join Date: Jun 2001
Rookie Year: 1998
Location: Houston, Texas
Posts: 3,731
Kevin Sevcik has a reputation beyond reputeKevin Sevcik has a reputation beyond reputeKevin Sevcik has a reputation beyond reputeKevin Sevcik has a reputation beyond reputeKevin Sevcik has a reputation beyond reputeKevin Sevcik has a reputation beyond reputeKevin Sevcik has a reputation beyond reputeKevin Sevcik has a reputation beyond reputeKevin Sevcik has a reputation beyond reputeKevin Sevcik has a reputation beyond reputeKevin Sevcik has a reputation beyond repute
Send a message via AIM to Kevin Sevcik Send a message via Yahoo to Kevin Sevcik
Re: Dry Ice as Motor Coolant

Poorly secured dry ice on a robot would be a hazard if the robot tipped. Plus you're going to confuse field staff with your "smoking" motor. Plus thermal stresses like that aren't good for a motor. Plus condensation. I'll pile on with everyone else and ask what you're doing to this motor that's making it so hot.
__________________
The difficult we do today; the impossible we do tomorrow. Miracles by appointment only.

Lone Star Regional Troubleshooter
  #22   Spotlight this post!  
Unread 14-02-2015, 09:56
Ether's Avatar
Ether Ether is offline
systems engineer (retired)
no team
 
Join Date: Nov 2009
Rookie Year: 1969
Location: US
Posts: 8,104
Ether has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond repute
Re: Dry Ice as Motor Coolant

Quote:
Originally Posted by BBray_T1296 View Post
at any standard temperature for a robotics venue, dry ice does not melt, but sublimes
CO2 cannot exist as a liquid below 75 psi pressure, regardless of temperature.

Also, CO2 cannot exist as a true liquid above approx 31 degrees C, regardless of pressure.


  #23   Spotlight this post!  
Unread 15-02-2015, 13:36
josephus's Avatar
josephus josephus is offline
Registered User
FRC #2980
 
Join Date: Jan 2013
Rookie Year: 2013
Location: oakharbor
Posts: 12
josephus is an unknown quantity at this point
Re: Dry Ice as Motor Coolant

Additionally, if you start a match with five grams of a substance and you end the match with five grams less than you started with, are you leaving materials on the field?
  #24   Spotlight this post!  
Unread 15-02-2015, 13:50
Ether's Avatar
Ether Ether is offline
systems engineer (retired)
no team
 
Join Date: Nov 2009
Rookie Year: 1969
Location: US
Posts: 8,104
Ether has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond repute
Re: Dry Ice as Motor Coolant

Quote:
Originally Posted by josephus View Post
are you leaving materials on the field?
...because CO2 is heavier than air?


  #25   Spotlight this post!  
Unread 15-02-2015, 14:06
matthewdenny's Avatar
matthewdenny matthewdenny is offline
Registered User
FRC #6054 (Dukes)
Team Role: Mentor
 
Join Date: Jan 2012
Rookie Year: 2012
Location: United States
Posts: 311
matthewdenny has a brilliant futurematthewdenny has a brilliant futurematthewdenny has a brilliant futurematthewdenny has a brilliant futurematthewdenny has a brilliant futurematthewdenny has a brilliant futurematthewdenny has a brilliant futurematthewdenny has a brilliant futurematthewdenny has a brilliant futurematthewdenny has a brilliant futurematthewdenny has a brilliant future
I would think the "leaving it on the field" argument people are making here would apply to pre pressurized pneumatics as well? Technically your robot would have less mass if the pneumatics was lower pressure at the end.
  #26   Spotlight this post!  
Unread 15-02-2015, 16:07
who716's Avatar
who716 who716 is offline
Registered User
AKA: Stephen Kalogiannis
FRC #0716 (Who'sCTEKS)
Team Role: Alumni
 
Join Date: Feb 2012
Rookie Year: 2011
Location: Falls Village Connecticut
Posts: 424
who716 is a splendid one to beholdwho716 is a splendid one to beholdwho716 is a splendid one to beholdwho716 is a splendid one to beholdwho716 is a splendid one to beholdwho716 is a splendid one to beholdwho716 is a splendid one to beholdwho716 is a splendid one to behold
Re: Dry Ice as Motor Coolant

we have specially made aluminum that we place on the motors in between matches and the heat from the motors transfers right over to heat the aluminum
__________________
2014-
-WPI number one seed
-Innovation in controls award
- NECMP#4 seed semifinalist
- 9th in NEW ENGLAND

2008- Connecticut regional winners
2004-UTC new England regional Winners
2001 highest rookie seed award winner
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


All times are GMT -5. The time now is 00:37.

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