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Originally Posted by IronMustang9
The legality of non-horizontal bumpers seems contradictory with the rules others are stating. It implies that it is legal to have an 8" vertical bumper, attached to an 8" vertical frame member at the corners, which fits within the 4" and 12" vertical envelope. Does anyone else see this configuration as illegal? If this is legal it allow for a much wider center gap for those doing something in the space between the bumpers.
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Yes. I see it as completely illegal within the rules as they currently are. The FRAME PERIMETER is the geometric shape defined by
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Originally Posted by R2 Blue Box
wrap[ping] a piece of string around the ROBOT at the BUMPER ZONE described in R22.
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Originally Posted by R22
BUMPERS must be located entirely within the BUMPER ZONE, which is the volume contained between two virtual horizontal planes, 4 in. above the floor and 12 in. above the floor, in reference to the ROBOT standing normally on a flat floor. BUMPERS do not have to be parallel to the floor.
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The FRAME PERIMETER is parallel to the ground, so your BUMPERS must cover 8 in. of the FRAME PERIMETER on either side of each corner of the FRAME PERIMETER, not merely have a length of 8 in. R19 makes this fairly clear:
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Originally Posted by R19
ROBOTS are required to use BUMPERS to protect all outside corners of the FRAME PERIMETER. For adequate protection, at least 8 in. of BUMPER must be placed on each side of each outside corner (see Figure 4-3). If a side is shorter than 8 in., the entire side must be protected by BUMPER (see Figure 4-4). A round or circular FRAME PERIMETER, or segment of the frame perimeter, is considered to have an infinite number of corners.
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Originally Posted by R19 Blue Box
The dimension defined in R19 is measured along the FRAME PERIMETER. The portion of the BUMPER that extends into the corner is not included in the 8 in. requirement.
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The first sentence of the Blue Box is the critical one. It says that 8 in. of BUMPER means an 8 in. projection onto the plane of the FRAME PERIMETER, and does not include the corner that meets the bumper from the other side of the corner.
EDIT: Here's a diagram. The most you can angle your bumpers while still remaining in the bumper zone would be 20.6 deg. for a section that provides 8 in. of coverage.