Bumpers sticking out 1" beyond frame perimeter

[EricH]

Originally Posted by Boltman

Figure 4-9 clearly shows a 7" gap covered by a bumper as OK along with a 1/4" gap..are we absolutely sure a 1" gap as OP described is not allowed?

BTW thanks for the clarification, I just want to get to the bottom of this for the OP.

There's a big difference in a gap in support and a gap between the Frame Perimeter and the Bumper.

= is bumper. _, -, and | are support and robot structure. Let's see if the ol' TextCAD can convey this.

What the OP is talking about:

==============
___|______|_____ 1" gap between bumper and frame, 8" between supports. This is legal in one configuration and illegal in another. I'll explain below.

What you're talking about, and what the Manual is talking about:

==============
----|______|----- Where the gap in the narrow areas is <1/4" bumper to frame, up to infinitely long, and the gap in the wide area is <8" long and infinitely deep


Now, that first situation is legal IFF the supports are part of the frame of the robot. Standard move to put bumpers on a WCD and all that. But, the supports count towards the Frame Perimeter. But let's switch that up.

===|=====|======
___|_______|______

Now the supports are on the bumpers. They're NOT part of the Frame Perimeter determination, they're part of the bumper hard parts (R21B), and at that point, you basically have 1/4" before your plywood goes beyond your 1" allowance (R21B, combined with R21A's plywood requirement). OP is talking about a 1" gap, so you've got hard parts (plywood) almost 2" beyond the Frame Perimeter. Sorry, folks, that's not going to fly...