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#1
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Appendage Rules
I'm not sure about the rules on arms for robots competing the the 2012 FRC competition. I know robots are allowed to extend one arm at a time, up to 14 in beyond frame perimeter. My team's robot is near its maximum length. Can we extend appendages beyond our maximum length?
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#2
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Re: Appendage Rules
Yes. The 14" is beyond the end of your frame perimeter. Your frame perimeter may be up to 28x38 and you can extend an appendage up to 14" beyond that.
For more discussion of this rule, look at this thread: http://www.chiefdelphi.com/forums/sh...d.php?t=100696 |
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#3
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Re: Appendage Rules
14 inch from the nearest point on your frame is a vertical plane (or more accurately envelope). If you are within the envelope, you are legal. Otherwise not. As far as length goes. So if you start extending at on corner of your frame, diagonally towards the opposite corner of the envelope. You can extend a fairly long distance. Much longer than 14 inches. But if you penetrate the envelope, you become illegal. You'll have to indicate to the inspectors how you intend to avoid that.
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#4
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Re: Appendage Rules
Quote:
The rules could also be interpreted to say that the envelope has 14" radius arcs in the corners, or that you can't extend into corners and that you have to stay within perpendicular boundaries extending from each side. |
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#5
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Re: Appendage Rules
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The radius arcs I believe to be completely Valid. Not extending into those arcs I believe to be completely hokey. However, if you want anything other than an opinion, you must post your own Q&A. |
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#6
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Re: Appendage Rules
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If you go into the corner, you are at risk of crossing 2 edges of the frame perimeter at the same time. See [G21] for the penalty this situation. This would bar any devices in the corners unless they go out one side and twist/extend into place. |
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#7
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Re: Appendage Rules
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[G21] Robots may extend one appendage up to 14 in. beyond a single edge of their frame perimeter at any time. There is no specification of any direction that should be measured from nor any point on the frame. Therefore, I choose the one most advantageous to my self. Without specifications, that is the most appropriate and also tends to be how inspectors do it [IMO, but I do understand that my O is not necessarily all that good]... So far, I can find no update that references G21. I could be wrong, but I don't think so. Additionally the following question and answer seem to me to bear this out: Q. What is the width limit of an appendage? Can an appendage cross the line drawn as an extension of a perimeter edge that is perpendicular to the base edge that the appendage is crossing? FRC0053 2012-01-15 A. There is no explicit width limit for a Robot appendage. Per Rule [R21], "Robots may extend one appendage up to 14 in. beyond a single edge of their Frame Perimeter at any time." |
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#8
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Re: Appendage Rules
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#9
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Re: Appendage Rules
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#10
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Re: Appendage Rules
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A corner is an intersection of 2 edges and crossing over the corner would most likely constitute crossing 2 edges simultaneously, which is a penalty under [G21]. |
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#11
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Re: Appendage Rules
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#12
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Re: Appendage Rules
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So why don't you ask the question on Q&A? You have a team account. If there are several people saying that you could easily be wrong, and some of them are inspectors/refs, or have long experience reading and interpreting the rules, then maybe you need to think about your design a bit. |
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#13
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Re: Appendage Rules
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Secondly, our robot doesn't even do that, so it has no bearing on us... |
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#14
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Re: Appendage Rules
And yes, GDC should have put a picture in the rules. They did it for bumpers. Why not this...
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#15
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Re: Appendage Rules
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It would have been much cleaner if they had simply defined a horizontal envelope as they have in past years, e.g. 56x66 or 28x38 + 14 in any one direction at a time. IMHO, the "can't cross a second perimeter edge" language is confusing when they define the perimeter as the path made by a piece of string stretched around the frame. Obviously, I'm only crossing that string on one side. But whatever. Since we'll have a rectangular frame, I'm confident I know the limits of the appendages. Last edited by LinuxArchitect : 08-02-2012 at 14:27. |
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