How are you pushing down bridge?

[midway78224]

We are design a bridge mechanism and seeing what other people are using and what kind of success they are having

[CalTran]

We have an one inch 1/8" wall aluminum tubing arm with a little under 90 degree "bend" in it with a free wheel on the end being turned by a banebot(I think?). I'm can't contest to the success, but from what I've heard it works beautifully.

[Johnny_5]

Marysville 3484 is pushing the bridge down with their robot. We lift the robot into the air and put our omni wheels down to push the bridge down.

[BOSS]

TEAM F.R.E.D is using an arm on a window motor with a wheel at the end, having issues trying to get it to reverse just get it to go forward. I am sure there should be a way to make a relay go forward and reverse or am I mistaken.

[legogeek24]

@BOSS, I'm pretty sure relays are either on or off, with no direction. At least, I've never heard reversing a relay is possible.

@Johnny_5, how exactly are you accomplishing that? When you lift your robot in the air, aren't the bumper rules violated?

As far as my team, we're going to use our movable shooter/cannon to push the bridge down as we drive onto it.

[CalTran]

Originally Posted by legogeek24

As far as my team, we're going to use our movable shooter/cannon to push the bridge down as we drive onto it.

How on earth does that work?

[dellagd]

Originally Posted by BOSS

TEAM F.R.E.D is using an arm on a window motor with a wheel at the end, having issues trying to get it to reverse just get it to go forward. I am sure there should be a way to make a relay go forward and reverse or am I mistaken.

@Leogeek24 @BOSS:

I must assume you are using a Spike type thing, because then if so there most definitely is.

The relay (at least the spikes) Flip their output polarity when given that certain command. Someone correct me if Im wrong

http://www.wbrobotics.com/javadoc/ed...ibj/Relay.html

If you look at the relay.direction stuff, there is like kReverse and kForward or something along the lines of that.

How on earth does that work?

What the..... Winning

[BOSS]

We are programming in Labview so the Kforward stuff is Greek to me and our programmers. we are using the Spike Relay to control the motor. Any one got stuff on Labview.

[jp1247]

Well, this may sound odd, but we are doing a wheelie and pushing it down the the front wheels...

[dellagd]

Originally Posted by BOSS

We are programming in Labview so the Kforward stuff is Greek to me and our programmers. we are using the Spike Relay to control the motor. Any one got stuff on Labview.

Sorry no.

I mean this humorously, but me and the other main programmer are hard-core C++ & JAVA guys. LabVIEW makes at least us two shiver.

[chi-town-biker]

Originally Posted by BOSS

We are programming in Labview so the Kforward stuff is Greek to me and our programmers. we are using the Spike Relay to control the motor. Any one got stuff on Labview.

Here's a great source of LabView code snippets including code for relays. http://team358.org/files/programming...2009-/LabVIEW/ Thanks Robotic Eagles.

[372 lives on]

Originally Posted by Johnny_5

Marysville 3484 is pushing the bridge down with their robot. We lift the robot into the air and put our omni wheels down to push the bridge down.

my friend says his robot does this to didn't think it we be used by anyone else o.O

Originally Posted by legogeek24

@Johnny_5, how exactly are you accomplishing that? When you lift your robot in the air, aren't the bumper rules violated?

[R01-2]....Note:..... A Robot in a transitory state of crossing onto/off of a Bridge or Barrier is not considered to be on a flat floor.

yeah team update 2012-01-20

[MrForbes]

When it's on the bridge, it's in a transitory state...but when it is lifting up and is not yet on the bridge, it might be violating the rule?

We don't know if ours works yet, we have to put some weight on the bridge and try it. Or at least draw a Free Body Diagram, so we can figure out if it should work. It's just an arm that pops down in front of the robot at an angle, and we drive the robot into the bridge, and hopefully push the end of the bridge down as we move forward. It's pneumatically actuated.

[wireties]

FORST Team 1296 is using a van door motor geared up a bit to push down an arm made with 1" square aluminum extrusion. The arm is 2-pronged, we are hoping a ball (on the bridge) might roll between the prongs and into the gatherer.

[ksafin]

Team 3992 is using a 12" stroke pneumatic cylinder to facilitate a 90 degree retraction and extension of an arm.