Go Back   VEX Forum > Competitions > VEX Robotics Competition > VRC Sack Attack (2012-2013 VRC Game)

Reply
 
Thread Tools
  #11  
Old 05-03-2012, 10:07 AM
Ryan Dognaux's Avatar
Ryan Dognaux Ryan Dognaux is offline
Senior Member
VEX # 0000
 
Join Date: Aug 2006
Location: St. Charles, MO
Posts: 222
Images: 2
Send a message via AIM to Ryan Dognaux
Re: Using Pneumatics

Quote:
Originally Posted by Vex1622 View Post
Does anyone think that the pneumatics only can lift a bucket all the way to the trough?
It's very possible though using elastic assistance via elastic tubing or rubber bands. Check out the DiscoBots robot from Gateway: https://vimeo.com/40536229 (Look ~0:40 seconds for the pneumatic cylinders raising and lowering their arm)

They used pneumatics to raise and lower their arm, allowing them to have more motors on their drive. How well it actually performed, I'm not sure - but it's definitely not par for the course in VEX, so I think it's pretty cool.
__________________
Ryan Dognaux
Wandering VEX Enthusiast
Former Mentor for VRC / FRC 357 - Royal Assault
VRC357 Build Blog: http://vrc357.blogspot.com/
Reply With Quote
  #12  
Old 05-03-2012, 11:02 AM
bgambsky's Avatar
bgambsky bgambsky is offline
Senior Member
VEX # 1200
 
Join Date: Nov 2011
Location: Neenah, WI
Posts: 101
Send a message via Skype™ to bgambsky
Re: Using Pneumatics

Quote:
Originally Posted by Ephemeral_Being View Post
Sounds perfect. But I was planning to use Pneumatics with a button on the Joysticks. Same procedure? Just look for a pneumatic block? Or is there a something I'm missing?
Your able to use multiple selenoids and buttons on the controller to control as many pneumatic pumps as you want. There is no limit, which can be an advantage AND a disadvantage. The more pumps you use (depending on how many you plan to use) you will add more weight, including the tanks. So use them wisely, but it sounds you're only buying one kit so that won't be a problem. Good luck with them they're the best thing for our robots in the past years
__________________
1200 Syntax Error
"I reject your reality and substitute my own!"~Adam Savage
"If it doesn't work, you didn't build it right"
1200C 2011-2012

2011-2012 World Championship Divisional Excellence Award
Reply With Quote
  #13  
Old 05-08-2012, 11:48 AM
nickd2012's Avatar
nickd2012 nickd2012 is offline
Junior Member
VEX # 2587
 
Join Date: Nov 2011
Location: Houston, TX
Posts: 13
Re: Using Pneumatics

Quote:
Originally Posted by Ryan Dognaux View Post
It's very possible though using elastic assistance via elastic tubing or rubber bands. Check out the DiscoBots robot from Gateway: https://vimeo.com/40536229 (Look ~0:40 seconds for the pneumatic cylinders raising and lowering their arm)
Our arm worked very well. We used two double action pistons, one on each arm. We used a massive amount of latex on each arm (20-35 feet??). The arm was tensioned so that it favored the middle of its range of motion.

If I did it again I would use >2 single action pistons to raise the arm up and 1 single regulated to a lower power + gravity to bring it down. This would conserve air.

In our case it was very important to keep the latex fresh.

Wasabi had a very cool multi stage pneumatic arm. Ours passively adapted between the medium and high goals.
__________________
2587 DiscoBots, 2010-Present
FRC 2012: Laser Dragon Film, Build Log Lone Star 3rd Seed Alliance
Vex 2012: Mini Dragon Film Math Division Finalists
FRC 2011: DiscoSlide Film, 118 Parody Lone Star Regional Finalists
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

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

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


All times are GMT -6. The time now is 08:51 PM.


VEX and VEX Robotics are trademarks or service marks of Innovation First International, Inc.
Copyright © 2002-2013. All Rights Reserved. VEX Robotics, Inc. is a subsidiary of Innovation First International, Inc.
All other product names/marks of others are the property of their respective owners.