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-   -   3883 ball grabber prototype (http://www.chiefdelphi.com/forums/showthread.php?t=99731)

JesseK 12-01-2012 09:04
Re: 3883 ball grabber prototype
 
No one has talked about speed of the intake. How fast should it go?

Should the edge of the roller go at a set rate?
Should it go at the speed of the drive train?
Should it go at a faster speed that the drive train?
Should the driver be able to control the speeds, directions, or both?

A good prototype can answer these questions. You aren't done -- keep going!

Brandon Holley 12-01-2012 09:09
Re: 3883 ball grabber prototype
 
Good work so far! Welcome to CD.


One thing that hasn't been pointed out is the final implementation of this device. Be careful about how long those fingers are in respect to your frame perimeter. The rules are still a tad gray in my eyes with respect to rule [G21].

Quote:
FRC Manual
[G21]

Robots may extend one appendage up to 14in. beyond a single edge of their frame perimeter at any time. Violation: Foul for exceeding size allotments; Technical-Foul for continuous or repeated violations.
If the fingers on your roller are constantly spinning outside your frame perimeter, I would say that you would be constantly violating G21 (each finger being a different appendage).

I think there are simple ways to design around this, but its something to consider in your final design.

Keep up the good work.

-Brando

mathking 12-01-2012 09:30
Re: 3883 ball grabber prototype
 
Quote:
Originally Posted by Brandon Holley (Post 1103405)
Good work so far! Welcome to CD.


One thing that hasn't been pointed out is the final implementation of this device. Be careful about how long those fingers are in respect to your frame perimeter. The rules are still a tad gray in my eyes with respect to rule [G21].



If the fingers on your roller are constantly spinning outside your frame perimeter, I would say that you would be constantly violating G21 (each finger being a different appendage).

I think there are simple ways to design around this, but its something to consider in your final design.

Keep up the good work.

-Brando
This is a good question for the GDC. One a lot of teams should pay attention to.

I tend to think you might be right here since the only part(s) moving outside the perimeter are the pieces of tubing, so it might well count as multiple appendages. (I guess if you were really clever you could engineer it so that there was only ever one outside the frame perimeter at a time.)

On the other hand if the whole mechanism moved then it might well count as one appendage and so as long as the spinning parts didn't violate the 14" rule it would be OK. As I said, a question for the GDC.

FRC3883FRC 12-01-2012 09:39
Re: 3883 ball grabber prototype
 
Thanks for all the help. Our team is meeting today and I will bring these point up to the team. Thanks for all the help again! :]

Alex.q 13-01-2012 00:09
Re: 3883 ball grabber prototype
 
Quote:
Originally Posted by Brandon Holley (Post 1103405)
Good work so far! Welcome to CD.


One thing that hasn't been pointed out is the final implementation of this device. Be careful about how long those fingers are in respect to your frame perimeter. The rules are still a tad gray in my eyes with respect to rule [G21].



If the fingers on your roller are constantly spinning outside your frame perimeter, I would say that you would be constantly violating G21 (each finger being a different appendage).

I think there are simple ways to design around this, but its something to consider in your final design.

Keep up the good work.

-Brando
oh whoops. The way I interpreted this rule was that as many things as you want can extend 14" outside frame as long as they were all on the same side of the robot. Good catch. When someone submits this to Q&A, please post the answer back here.

ThaineP 13-01-2012 08:38
Re: 3883 ball grabber prototype
 
It looks like a minesweeping tank. Nice design, too. I've seen a design like that used before in 2009 and 2010, they seem to work well. I think my team will use a similar thing for the ball collector.

Jengles 16-01-2012 12:15
Re: 3883 ball grabber prototype
 
What size is the tubing?


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