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#1
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New size/bumper rules that every team should know
Two subtle changes to the rules that have huge impact, and the potential to really hurt some teams if they're not careful.
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However, bumpers must still be removed for inspection so that the robot can be weighed. So don't make them 100% integral to the frame just yet. The second, more subtle change. For the first time since 2009, the robot is limited to the same size in its starting configuration as during the rest of the match. However, the rule is not the same as the 2009 rule. 2009 was frame perimeter based, and banned any extension over the starting perimeter. If you chose to be small, you were stuck small. This year, however, it's a fixed maximum size. If you want to reach over the bumper to expand your intake, grab a rope, or anything else, you can do this, but only if your base/frame perimeter is smaller than the maximum size. Say, for example, you choose the 36"x40"x24" size. A drive base/bumper assembly built at 36"x40" cannot have a drop-down intake of any sort, and will be constrained to a bumper-cutout intake with 6" on each side (another change, down from 8"). However, if the team instead builds their bot 36"x30", they have a full 10 inches outside of the bumper to extend and build anything they want. This mechanism must still retract due to <R02> for the start of the match. Plan your drive base carefully. Bigger is not necessarily better, and may lock you into a design and prevent you from duplicating something cool you see at a first event. |
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#2
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Re: New size/bumper rules that every team should know
Whether or not the bumpers are included in the perimeter is contrasted in R01 and R03. Has FIRST said that the bumpers are included in the perimeter? If so, please post the link.
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#3
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Re: New size/bumper rules that every team should know
<R01> and <R03> do not conflict. <R01> states that the robot must have a FRAME PERIMETER, meeting the fixed, non-actuating, etc. requirements we all know and love. The FRAME PERIMETER is referenced in <G09>, which deals with interactions between robots, <R02>, which states that everything except the bumpers must start (but not necessarily end) the match inside the frame perimeter, and repeatedly throughout the bumper rules, which deal with how the bumpers must attach to and interact with the FRAME PERIMETER. However, <R03>, which deals with the actual size limit of the robot, clearly includes the bumpers in this, and does not reference the FRAME PERIMETER in any way.
Last edited by Joe G. : 07-01-2017 at 15:03. |
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#4
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Re: New size/bumper rules that every team should know
I believe the frame perimeter rules are there to help define the bumper rules (I.E if you have a V robot frame you don't need to put bumpers inside the V) and to define the starting configuration. There are no frame perimeter limits only volume limits.
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#5
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Re: New size/bumper rules that every team should know
This is immediately what I thought of as well. The last 4 seasons have had very different bumper and frame perimeter rules - FIRST and the GDC should highlight this subtle (but major) change as much as they can over the next 10 days or so.
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#6
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Re: New size/bumper rules that every team should know
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#7
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Re: New size/bumper rules that every team should know
This seems to defeat the purpose of bumpers, at least how they've been used the past few years, doesn't it?
They used to guarantee about 6 inches of distance between "internal components" of robots. With this game, everything will always be inside the frame perimeter, but the grace distance that the bumpers used to provide doesn't exist. Teams will have to be careful to either build robustly, or be well inside the bumpers. Bumpers may or not actually provide any protection. This makes the real volume less than the stated volume. |
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#8
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Re: New size/bumper rules that every team should know
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At the start of the match all parts of the robot except the bumpers must be within the frame perimeter (which does not include the bumpers) as typical in FRC. The grace distance is still there. The only things that are vulnerable are frame perimeter extensions that deploy after the match starts as usual. |
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#9
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Re: New size/bumper rules that every team should know
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#10
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Re: New size/bumper rules that every team should know
I'm afraid there's going to be several teams unable to compete at their event because they show up with bumpers outside the sizing box and have no way of cutting 5-6" both directions. Glad I'm not the LRI that has to tell them that.
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#11
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Re: New size/bumper rules that every team should know
Not sure if this is the right place but would these bumpers be legal?
http://imgur.com/aK9ofzy The gap is 13 inches but there will be a beam above the bumpers connecting the two sides so that the frame is technically all closed. edit the two shorter sides are both 6 inches. |
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#12
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Re: New size/bumper rules that every team should know
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#13
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Re: New size/bumper rules that every team should know
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What is your Frame Perimeter? Read R01, particularly the blue box. Now read R22, including the blue box, and R29G. I'll explain in the spoiler, but I'd like you to read those rules first. Spoiler for The Answer:
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#14
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Re: New size/bumper rules that every team should know
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#15
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Re: New size/bumper rules that every team should know
Yes, last year's was the highest bumper zone since our rookie year (2012), and this year is the lowest since then. Fortunately, there are no scoring platforms or defenses or anything but flat carpet to drive over.
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