Go to Post I jumped up and yelled when I saw both my teams in the same division. Less running for me in the pits. Thank you, Great Homie in the Sky! - Barry Bonzack [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

 
Closed Thread
Thread Tools Rate Thread Display Modes
  #16   Spotlight this post!  
Unread 15-02-2004, 23:08
Ryan Cumings's Avatar
Ryan Cumings Ryan Cumings is offline
Programmer and University Rejected
#0134 (Team Discovery)
Team Role: Programmer
 
Join Date: Jan 2004
Rookie Year: 2000
Location: Pembroke, NH
Posts: 65
Ryan Cumings is an unknown quantity at this point
Send a message via AIM to Ryan Cumings
Re: Two pressures?

Quote:
Originally Posted by NoRemorse
Well, this is the info I can give you.

...

[tanks]=====['T']===[reg at 60psi]===[solenoid]===[r]
|| ||
\====[reg at 30psi]===[solenoid]===[e]


r and e are 'extened' and 'retract'

I don't know if ths what your shooting for though
I was shooting for something like this

Code:
[tanks]===[solenoid]===[reg at 60psi]===[r]
                ||
                \====[reg at 30psi]===[e]
edit:
bah stupid formating

edit 2x:
this doesn't look right at all... must mean it's time for sleep
__________________
Suddenly being rejected from college feels right during the build season. Now I am a mentor.

Last edited by Ryan Cumings : 15-02-2004 at 23:14.
  #17   Spotlight this post!  
Unread 15-02-2004, 23:10
jimfortytwo jimfortytwo is offline
Registered User
AKA: Jim Paulos
#0418 (Purple Haze)
Team Role: Student
 
Join Date: Feb 2003
Rookie Year: 2002
Location: austin
Posts: 65
jimfortytwo is just really nicejimfortytwo is just really nicejimfortytwo is just really nicejimfortytwo is just really nicejimfortytwo is just really nice
Send a message via ICQ to jimfortytwo Send a message via AIM to jimfortytwo Send a message via Yahoo to jimfortytwo
Re: Two pressures?

I understand your intent now... your clarification got sandwiched in between my read and my write. I don't know what your mechanism actually looks like, but would it be possible to leave one side of your pneumatic vented and just use a bit of surgical tubing for the extension?
I'm not sure what the technical term is, but I know I've played with cylinders that had a spring loaded extension and a pneumatic retraction. I couldn't tell you if those components are FIRST-legal, but you might be able to cobble a reasonable facimile together. Then again it might not be worth the added complexity.
  #18   Spotlight this post!  
Unread 15-02-2004, 23:13
NoRemorse's Avatar
NoRemorse NoRemorse is offline
FOCUS Integration, LLC - Owner
AKA: Brian Roberts
FRC #1023 (Bedford Express)
Team Role: Alumni
 
Join Date: Feb 2003
Rookie Year: 2003
Location: Bedford
Posts: 221
NoRemorse has a spectacular aura aboutNoRemorse has a spectacular aura about
Send a message via AIM to NoRemorse Send a message via MSN to NoRemorse
Re: Two pressures?

that should work, but i dont know how fast the regs bleed off pressure when the air flows backward thriygh them. by puuting them before a solenoid (which requires 2 soleniods) you get a quick dump of rpessure and a MUCh quicker acting piston

But i have never tested this, the flow of air back through the reg may be suffecient for your applicatrion!
__________________

http://LSJBuildUp.com -Documenting the build of my LSJ, as well as other influential cars.
  #19   Spotlight this post!  
Unread 15-02-2004, 23:14
KenWittlief KenWittlief is offline
.
no team
Team Role: Engineer
 
Join Date: Mar 2003
Location: Rochester, NY
Posts: 4,213
KenWittlief has a reputation beyond reputeKenWittlief has a reputation beyond reputeKenWittlief has a reputation beyond reputeKenWittlief has a reputation beyond reputeKenWittlief has a reputation beyond reputeKenWittlief has a reputation beyond reputeKenWittlief has a reputation beyond reputeKenWittlief has a reputation beyond reputeKenWittlief has a reputation beyond reputeKenWittlief has a reputation beyond reputeKenWittlief has a reputation beyond repute
Re: Two pressures?

There is a way to retract the cylinder using no air at all - leave the other end of the cylinder open - no connection, and use a small spring or the surgical tubing to retract the cylinder

then you only need a single valve to pressurize the business end, and when you close the valve it will vent the air, and the surgical tubing will retract the cylinder.
  #20   Spotlight this post!  
Unread 15-02-2004, 23:16
ngreen ngreen is online now
Registered User
AKA: Nelson Green
FRC #1108 (Panther Robotics)
Team Role: Mentor
 
Join Date: Jan 2003
Rookie Year: 2002
Location: Paola, KS
Posts: 821
ngreen has a brilliant futurengreen has a brilliant futurengreen has a brilliant futurengreen has a brilliant futurengreen has a brilliant futurengreen has a brilliant futurengreen has a brilliant futurengreen has a brilliant futurengreen has a brilliant futurengreen has a brilliant futurengreen has a brilliant future
Re: Two pressures?

I think using the single solenoid off a secondary regulator would work best. Just shorten all your tubing so it will regenerate pressure quicker. You don't need to worry about flow controls all that will do will slow down your cyclinder and not reduce amount of air used.

I think he wants to extend and then retract Ken.

edit: But I imagine it would work the other way too

Last edited by ngreen : 15-02-2004 at 23:21.
  #21   Spotlight this post!  
Unread 15-02-2004, 23:16
NoRemorse's Avatar
NoRemorse NoRemorse is offline
FOCUS Integration, LLC - Owner
AKA: Brian Roberts
FRC #1023 (Bedford Express)
Team Role: Alumni
 
Join Date: Feb 2003
Rookie Year: 2003
Location: Bedford
Posts: 221
NoRemorse has a spectacular aura aboutNoRemorse has a spectacular aura about
Send a message via AIM to NoRemorse Send a message via MSN to NoRemorse
Re: Two pressures?

Quote:
There is a way to retract the cylinder using no air at all - leave the other end of the cylinder open - no connection, and use a small spring or the surgical tubing to retract the cylinder
GREAT POINT!!

this might be exactly what your are looking for because one way uses no gas consumption.
__________________

http://LSJBuildUp.com -Documenting the build of my LSJ, as well as other influential cars.
  #22   Spotlight this post!  
Unread 15-02-2004, 23:19
Ryan Cumings's Avatar
Ryan Cumings Ryan Cumings is offline
Programmer and University Rejected
#0134 (Team Discovery)
Team Role: Programmer
 
Join Date: Jan 2004
Rookie Year: 2000
Location: Pembroke, NH
Posts: 65
Ryan Cumings is an unknown quantity at this point
Send a message via AIM to Ryan Cumings
Re: Two pressures?

Quote:
Originally Posted by KenWittlief
There is a way to retract the cylinder using no air at all - leave the other end of the cylinder open - no connection, and use a small spring or the surgical tubing to retract the cylinder

then you only need a single valve to pressurize the business end, and when you close the valve it will vent the air, and the surgical tubing will retract the cylinder.
Yes, but unfortunately the surgical tubing doesn't provide the retracting force we need. We are trying to save air on the extend. If you look at the picture you may see more clearly why we want to save air

http://www.chiefdelphi.com/forums/sh...ad.php?t=25130

24 '' stroke if I remember right
__________________
Suddenly being rejected from college feels right during the build season. Now I am a mentor.
  #23   Spotlight this post!  
Unread 15-02-2004, 23:19
jimfortytwo jimfortytwo is offline
Registered User
AKA: Jim Paulos
#0418 (Purple Haze)
Team Role: Student
 
Join Date: Feb 2003
Rookie Year: 2002
Location: austin
Posts: 65
jimfortytwo is just really nicejimfortytwo is just really nicejimfortytwo is just really nicejimfortytwo is just really nicejimfortytwo is just really nice
Send a message via ICQ to jimfortytwo Send a message via AIM to jimfortytwo Send a message via Yahoo to jimfortytwo
Re: Two pressures?

[quote=KenWittlief]There is a way to retract the cylinder using no air at all - leave the other end of the cylinder open - no connection, and use a small spring or the surgical tubing to retract the cylinder [\QUOTE]

Gentlemen, I think we should all take a big step back from this forum for the night. I've never seen a room full of guys who were all to tightly on the same wavelength!

That or we all need to learn to type faster.

Looking at your robot, getting an elastic extension does look like a pretty hairy engineering problem. It could be done... but I'd hate to tac anything onto such a simple mechanism.

Last edited by jimfortytwo : 15-02-2004 at 23:21.
  #24   Spotlight this post!  
Unread 15-02-2004, 23:22
ngreen ngreen is online now
Registered User
AKA: Nelson Green
FRC #1108 (Panther Robotics)
Team Role: Mentor
 
Join Date: Jan 2003
Rookie Year: 2002
Location: Paola, KS
Posts: 821
ngreen has a brilliant futurengreen has a brilliant futurengreen has a brilliant futurengreen has a brilliant futurengreen has a brilliant futurengreen has a brilliant futurengreen has a brilliant futurengreen has a brilliant futurengreen has a brilliant futurengreen has a brilliant futurengreen has a brilliant future
Re: Two pressures?

Yeah you can switch ken's model to extend with no air and then retract.
It's hard to explain well though.

Yeah tough, how does your mechanism set when it is extended or is the 24"cyclinder the bulk of the extension.

Last edited by ngreen : 15-02-2004 at 23:24.
  #25   Spotlight this post!  
Unread 15-02-2004, 23:27
Ryan Cumings's Avatar
Ryan Cumings Ryan Cumings is offline
Programmer and University Rejected
#0134 (Team Discovery)
Team Role: Programmer
 
Join Date: Jan 2004
Rookie Year: 2000
Location: Pembroke, NH
Posts: 65
Ryan Cumings is an unknown quantity at this point
Send a message via AIM to Ryan Cumings
Re: Two pressures?

Quote:
Originally Posted by ngreen
Yeah you can switch ken's model to extend with no air and then retract.
It's hard to explain well though.

Yeah tough, how does your mechanism set when it is extended or is the 24"cyclinder the bulk of the extension.
The bottom piston retracts to lift the bulk of the arm vertical. Then the 24'' piston extends to hook on. Then retracts to lift off the ground, currently this takes about 1 - 1.5 min with one accumulator.
__________________
Suddenly being rejected from college feels right during the build season. Now I am a mentor.
  #26   Spotlight this post!  
Unread 15-02-2004, 23:37
ngreen ngreen is online now
Registered User
AKA: Nelson Green
FRC #1108 (Panther Robotics)
Team Role: Mentor
 
Join Date: Jan 2003
Rookie Year: 2002
Location: Paola, KS
Posts: 821
ngreen has a brilliant futurengreen has a brilliant futurengreen has a brilliant futurengreen has a brilliant futurengreen has a brilliant futurengreen has a brilliant futurengreen has a brilliant futurengreen has a brilliant futurengreen has a brilliant futurengreen has a brilliant futurengreen has a brilliant future
Re: Two pressures?

If you can find a place that the latex tubing will pull enough that it will extend the cyclinder when it is pointing down and using the non-pneumatic air extension you can make Ken's spring way work. If not, route all exhaust from you cyclinder to a single solenoid with a stop on one of the output and block so you can control the stroke length of the cyclinder. You look like you could have the cyclinder partially extended to begin with and a least cut down on the wait for it to lift. Or you could lengthen your arm and purchase a shorter cyclinder. A 16" would do the job or even a 12" or 8" and would reduce the air needed. You lose height gained but an inch or 2 feet both get you 50 points. The one just works faster. I would add the second accumulator and make sure to reduce all tubing lengths. PM me and I'll give you more info about the single solenoid.
  #27   Spotlight this post!  
Unread 15-02-2004, 23:43
greencactus3 greencactus3 is offline
occra 23.
AKA: ryo
None #1481
Team Role: Alumni
 
Join Date: Feb 2004
Rookie Year: 2006
Location: North Farmington, MI
Posts: 1,523
greencactus3 is a name known to allgreencactus3 is a name known to allgreencactus3 is a name known to allgreencactus3 is a name known to allgreencactus3 is a name known to allgreencactus3 is a name known to all
Send a message via AIM to greencactus3 Send a message via MSN to greencactus3
Re: Two pressures?

how about another idea. i can't see exactly how well this'll fit, but how about starting with your cylinder half extended. (use the double w/t single solenoid) from the angle of your photo, it seems like you may be able to do this. maybe.
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 22:39.

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