View Single Post
  #2   Spotlight this post!  
Unread 14-02-2013, 19:43
Nuttyman54's Avatar
Nuttyman54 Nuttyman54 is offline
Mentor, Tactician
AKA: Evan "Numbers" Morrison
FRC #5803 (Apex Robotics) and FRC #0971 (Spartan Robotics)
Team Role: Mentor
 
Join Date: Jan 2005
Rookie Year: 2005
Location: Seattle, WA/Mountain View, CA
Posts: 2,137
Nuttyman54 has a reputation beyond reputeNuttyman54 has a reputation beyond reputeNuttyman54 has a reputation beyond reputeNuttyman54 has a reputation beyond reputeNuttyman54 has a reputation beyond reputeNuttyman54 has a reputation beyond reputeNuttyman54 has a reputation beyond reputeNuttyman54 has a reputation beyond reputeNuttyman54 has a reputation beyond reputeNuttyman54 has a reputation beyond reputeNuttyman54 has a reputation beyond repute
Send a message via AIM to Nuttyman54
Re: FIRST Climb for 237

Quote:
Originally Posted by donnie99 View Post
The perimeter is exactly 111.5" around. It was measured by multiple people. The locking arm idea would be great if the system wasn't using pneumatic cylinders to lock on the pole. The system will hold as long as there is pressure in the system, and we've checked our system multiple times already.
But you're using motors to rotate the arms right? I think his point was that if you're in the middle of a flip when time runs out, you could have a pneumatically actuated brake that prevents your arm from backdriving. Otherwise, if your robot is in mid-flip and is, for example, horizontal, it's almost guaranteed that if power is cut the arm will backdrive and your robot will sag below the line, reducing your score.

It's possible your gear reduction is high enough that simply putting the speed controller in 'brake' mode is enough to do this, but you'd have to check.
__________________
Reply With Quote