Bumper question

[GaryVoshol]

Originally Posted by SenorZ

To me it seems like they are saying you can't have a bumper go inside a cut-out. Which is odd.

You can have a bumper-like structure inside your Frame Perimeter (FP), but you can't have a Bumper inside the FP.

The difference is in the weight allocation. Any bumper-like structure inside the FP must be counted in the 120 lbs limit. And if you make them color-coded, so that you have 2 of them, you have to count the weight of both pieces at the same time (additional Mechanisms).

Your robot could look somewhat like the circled area except:
-- the bumper-like structure on the inside of the cutout could not extend past the frame
-- the Bumper could not extend past the vertex

[Al Skierkiewicz]

Quite frankly, I don't know why that interior bumper is outlined as "not OK". The rules say that a bumper must attach to the frame perimeter, which it does, it must be a minimum of 8" on either side of an exterior vertex, can't tell since the drawing is not dimensioned, etc. There do appear to be any rules that prevent interior bumpers. If I find out, I will let you know.

[Jibsy]

Just want to be really clear here. Since the maximum width of the bot is 28", andy ou need 8" of bumper on each side of that, your very maximum opening on the front is 12"? If you have no frame there, just a gap, does the 8" rule still apply? (Meaning you can't have say an 18" gap with 5" of bumpers on each side?

I would hate for this rule to be interpreted wrong and potentially use an opening 30% smaller than legal.

[Al Skierkiewicz]

Jared,
Current rules require a minimum of an 8" bumper section on both sides of the corner of the robot. Other parts of the bumper rule(s) cover slots, indents and gaps.

[militaryrobot]

Originally Posted by KevinGoneNuts

While I have you all here. I also have a bumper question. Attached is a picture of a bumper idea, after reading the rules it seems that this is alright? I want to be 100% sure. Does it seem okay to you?


Attachment 11290

Look legal. Our team is all ways trying to stay in legal and that is our basic bumper desgin
.

[jvriezen]

Originally Posted by KevinGoneNuts

While I have you all here. I also have a bumper question. Attached is a picture of a bumper idea, after reading the rules it seems that this is alright? I want to be 100% sure. Does it seem okay to you?


Attachment 11290

This does not look ok to me. I'm assuming the blue parts are bumpers and the dimensions refer to the outer extreme bumper dimensions and not the elements/sides of the frame perimeter.

You must have 8" of frame on either side of each vertex. With an 8" bumper segment where the 8" also covers the corner space, you would only have about 5" of frame at the vertex.

Also, I see that the outer dimensions, which include the bumper are 28x38. Since happens to be the max dimensions of the robot *without* the bumpers, I think you may be confused, as this robot is about 6" smaller than it could be. That being said, I would recommend planning for no bigger than 27x37, because this gives you room for bolt heads and things being a bit 'out of square, because the inspector's sizing box (and the inspectors) are unforgiving about size (and weight)

[jvriezen]

I created a TrueType font specifically designed for FRC to fit on minimal bumpers (8" + 3 1/4" endgrain)

When scaled to 4" tall, the stroke is exactly 3/4" and the width of each digit is exactly 2". With a 1/2" space between digits, a four digit number takes only 9.5", easily fitting on a 11" bumper

http://www.chiefdelphi.com/media/papers/2630

[junefish]

Our bumpers last year had 2-4 inches of "fluffy" parts and they fit the requirements--the fluffy parts were noodles, however, so I'm not sure if that's what you meant.

[BHOP]

"Robots are required to use Bumpers to protect all exterior vertices of the Frame Perimeter"

What if you have no exterior vertices...meaning your robot has a circular frame perimeter?