
30-01-2014, 12:15
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Mentor, Tactician
AKA: Evan "Numbers" Morrison
 FRC #5803 (Apex Robotics) and FRC #0971 (Spartan Robotics)
Team Role: Mentor
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Join Date: Jan 2005
Rookie Year: 2005
Location: Seattle, WA/Mountain View, CA
Posts: 2,140
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Re: The age old question - bumper mounting
Quote:
Originally Posted by bachster
Dave, this looks like a very slick way to attach bumpers, but my initial reaction is that it would be in violation of R21-F (must attach to the FRAME PERIMETER of the ROBOT ...) and/or R26 (BUMPERS must be supported by the structure/frame of the ROBOT (see Figure 4-10). To be considered supported, a minimum of ½ in. at each end of the BUMPER must be backed by the FRAME PERIMETER...)
Since your FRAME PERIMETER (definition copied below for reference) is the top/bottom horizontal plate, it seems your BUMPERS are backed by an interior part of the robot, not the FRAME PERIMETER. Alternately, if you intend to define your FRAME PERIMETER as the vertical face which backs the bumpers, then the robot is in violation of the STARTING CONFIGURATION requirement.
Can you (or any experienced inspectors) help me understand how this attachment method is legal?
FRAME PERIMETER: the polygon defined by the outer-most set of exterior vertices on the ROBOT (without the BUMPERS attached) that are within the BUMPER ZONE. To determine the FRAME PERIMETER, wrap a piece of string around the ROBOT at the level of the BUMPER ZONE - the string describes this polygon.
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Yes, the picture Dave attached doesn't really tell the whole story. I didn't understand how it was legal until I saw it with half the bumpers mounted. Look at the attached cross section and it'll make a lot more sense.
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