How are you pushing down bridge?

[Mike Norton]

Van door motor gear down.

http://www.youtube.com/watch?v=BQ1mG...ature=youtu.be


No need to lift your robot off the ground if down right.

[MrForbes]

Originally Posted by 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.

You might want to make sure it will count as one appendage, not two. There's been a lot of discussion about this here and on Q&A. It's my understanding that a two pronged thingy is considered two appendages (and thus illegal) unless it's all one contiguous piece outside of the frame perimeter, even as it deploys.

[wireties]

Originally Posted by squirrel

You might want to make sure it will count as one appendage, not two. There's been a lot of discussion about this here and on Q&A. It's my understanding that a two pronged thingy is considered two appendages (and thus illegal) unless it's all one contiguous piece outside of the frame perimeter, even as it deploys.

It is one appendage leaving the perimeter that spits it into two equal-sized forks ... what on earth might contiguous mean in this context? It is solid, no articulating etc.

[MrForbes]

I wonder if pictures would help?

I think it means that the part outside the frame perimeter is all connected together.

But I'm not as imaginative as the GDC....

[wireties]

Originally Posted by squirrel

I wonder if pictures would help?

Out being welded but will post the cad later

[tux]

I am also having a problem with "contiguous" (as mentioned in the G21 team update).

Our extension is sort of like a pair of salad tongs. One of the tongs is articulated. The two tongs do not contact each other directly, but they are both connected to one other piece. In other words, they cannot be deployed separately. They are both part of one mechanism that is deployed as a single unit. Is that contiguous?

[tux]

Wups. I think this may be a better place for my question:

http://www.chiefdelphi.com/forums/sh...d.php?t=102627

[CalTran]

Depends on where they connect. If they connect inside the frame then it is my understanding that it is not a contiguous appendage. However, if they fork outside of the frame, then they are considered contiguous.

[wireties]

Originally Posted by CalTran

Depends on where they connect. If they connect inside the frame then it is my understanding that it is not a contiguous appendage. However, if they fork outside of the frame, then they are considered contiguous.

Look OK? And what if we add a little wheel on each fork?

[CalTran]

Originally Posted by wireties

Rule posting to follow:

[G21]
Robots may extend one appendage up to 14 in. beyond a single edge of their frame perimeter at any time.
Violation: Foul for exceeding size allotments; Technical-Foul for continuous or repeated violations.

[Blue Box]
These appendages are intended for use in manipulating Basketballs and/or Bridges. A Robot may have multiple extension devices onboard, but only one may be deployed at a given time.

All portions of an appendage that are outside the Frame Perimeter must be contiguous with each other. Very brief violations of the contiguity requirement as a single appendage is being extended or retracted will not be penalized.
[/Blue Box]

Emphasis mine. From the picture, it would appear that it is contiguous within the frame, and the two forks of the appendage cross at two separate points of your frame. So, I'm not sure, but I do not believe this would qualify as a contiguous appendage.

[wireties]

Originally Posted by CalTran

Rule posting to follow:



Emphasis mine. From the picture, it would appear that it is contiguous within the frame, and the two forks of the appendage cross at two separate points of your frame. So, I'm not sure, but I do not believe this would qualify as a contiguous appendage.

Hey - thanks for looking at it. We sure appreciate the advice. It is hard to tell from this rendering but the cross piece is outside the frame when extended. It is is roughly (vertically) over the edge of the bumpers. The frame is all 1x1 Al extrusion - see it running behind the rendered bumpers?

TIA

[372 lives on]

Very brief violations of the contiguity requirement as a single appendage is being extended or retracted will not be penalized.



yeah.

[MrForbes]

So use pneumatics to actuate your appendage

[tux]

Originally Posted by wireties

Look OK?

Looks a lot like what we have. I guess now it depends on the definition of "very brief," how quickly the mechanism deploys, and probably on which inspector you get on game day.

Originally Posted by wireties

And what if we add a little wheel on each fork?

I think the wheels are much less of a concern than the 2 prongs of the fork.