Bumper zone height

[mdiradoorian]

DO the bumpers need to be level with each other?

[slijin]

Originally Posted by mdiradoorian

DO the bumpers need to be level with each other?

No, they only need to be within the bumper zone, as per [R29].

[mdiradoorian]

Originally Posted by slijin

No, they only need to be within the bumper zone, as per [R29].

so bumper zone is within 2 to 10 in off the ground then and around exterior corners.

[PayneTrain]

To throw in what I believe to be a new bumper rule,

R35: The numerals must be at least 4 in. high, at least ¾ in. in stroke width, and be either white in color or outlined in white.

Emphasis mine.

The 148 numeration method of stenciling in with a silver sharpie is obsolete I guess, unless you're able to make a white sharpie show up. Bumm(p)er.

[Al Skierkiewicz]

Thomas,
Not really a new rule, just more distinct. 'Contrasting' under some lighting conditions was not 'contrasting' under others.

[Duke461]

I didn't want to create a new thread, and my question is similar:

Sorry for the large size, not sure how to make it smaller.
My question is:
Did FIRST make a mistake/typo in this picture? The two gaps labeled 10 inches are clearly not of identical lengths ( i even measured to make sure ). I understand why the "not ok" on the left is not ok, but, given the current numbers, i do not understand why the "ok" on the right is ok.
Thanks!
-duke

[Vermeulen]

R33 says:

Bumpers must be supported by the structure/frame of the Robot (i.e. the gap between the backing material and the frame must not be greater than ¼ in. and no section of Bumper greater than 8 in. may be unsupported). See Figure 4‑7.

I would interpret this as saying that for a bumper to be supported, the gap between the bumpers and the frame must be 1/4 in. or less. The right picture would then be OK because the bumper is supported over that length.

[slijin]

Originally Posted by Duke461

Did FIRST make a mistake/typo in this picture? The two gaps labeled 10 inches are clearly not of identical lengths ( i even measured to make sure ). I understand why the "not ok" on the left is not ok, but, given the current numbers, i do not understand why the "ok" on the right is ok.

Originally Posted by Vermeulen

I would interpret this as saying that for a bumper to be supported, the gap between the bumpers and the frame must be 1/4 in. or less. The right picture would then be OK because the bumper is supported over that length.

Not really - that interpretation makes the 7"x7" intrusion illegal.

Although not phrased particularly well, what [R33] is really saying is that any intrusion into your bot cannot exceed both 1/4" of depth and 8" of width. In other words, it's an either/or thing - if you're exceeding 1/4" of depth, you can't exceed 8" of width and vice versa.

[Duke461]

Originally Posted by slijin

Not really - that interpretation makes the 7"x7" intrusion illegal.

Although not phrased particularly well, what [R33] is really saying is that any intrusion into your bot cannot exceed both 1/4" of depth and 8" of width. In other words, it's an either/or thing - if you're exceeding 1/4" of depth, you can't exceed 8" of width and vice versa.

Ok it all makes sense now

[Al Skierkiewicz]

Samuel is correct. If there is a gap behind your bumper structure due to bolt heads, welds, warped plywood, etc. that do not exceed 1/4" then the gap is legal. If you have an irregularity in your frame for any reason, that exceeds 1/4", the width of said gap may not exceed 8 inches. Any gap greater than 1/4" is interpreted as "unsupported".

R33 Bumpers must be supported by the structure/frame of the Robot (i.e. the gap between the backing material and the frame must not be greater than ¼ in. and no section of Bumper greater than 8 in. may be unsupported). See
Figure 4-7.

Please note that this allows certain drive train designs to have gaps in the frame for wheels while still providing support for bumpers that meets the above rule.
This rule is identical to last year.

[Kevin Sevcik]

See here:
http://www.chiefdelphi.com/forums/sh...threadid=99458

Summary for your question: if the backing is within 1/4", the bumper is supported.

[protoserge]

[Edit: Internet is too fast]


As for the image, it's a non-scaled drawing so the notated dimensions are overruling to any perceived scale.

[Kusha]

Off topic: Could you have a bumper start at the 10inch mark. IE the bumpers lowest point is at the 10" mark?

[Ninja_Bait]

Originally Posted by Kusha

Off topic: Could you have a bumper start at the 10inch mark. IE the bumpers lowest point is at the 10" mark?

No. The ENTIRETY of the bumpers must be in the bumper zone.

[SenorZ]

I can see an issue when a high-bumper robot is going over the Barrier and a low-bumper robot approaches from the other side. There could be some serious overlapping issues and possible [G27] violation.