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Unread 11-01-2008, 11:34
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Re: Bumper Rule

Quote:
Originally Posted by Elgin Clock View Post
With a give maximum sized robot of 38" x 28" giving us:
((38*2) + (28*2)) = 132" perimeter

2/3 of 132" = 88"

Technically I guess you can only cover 88" worth of sides if you wanted to.

Some people tend to cover just 3 sides of their robots so using the 2 most basic configurations of robot design...

1) 38+38+28 = 104" (38" Sides & 28" Rear)

or

2) 28+28+38 = 64" (28" Sides & 38" Rear)

In configuration 1, you are good.

In configuration 2, you are not.

If you design your robot to be a wide base (example 2), and your widest part of your robot is facing forward, and you leave that unbumpered, I guess you are breaking a rule.

That kinda sucks...
Hey Elgin, try doing that math again on #2.
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Unread 11-01-2008, 11:40
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Re: Bumper Rule

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Originally Posted by Raul View Post
Hey Elgin, try doing that math again on #2.
Oops.. bad typo! LOL Thanks, I'll go back and edit that.
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Last edited by Elgin Clock : 11-01-2008 at 11:42.
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Unread 11-01-2008, 11:45
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Re: Bumper Rule

Quote:
Originally Posted by JesseK View Post
Specifically, the rule states that a STANDARD bumper as defined in Fig. 8-1 must be no shorter than 6 inches. Since they also do not want "hard" bumpers in the corners, you must place a vertical pool noodle to soften the corners of the side or front bumpers such that it covers the corner.

The extra vertical pool noodle that isn't part of the STANDARD bumper cannot count toward the minimum 6 inches. Though it is unfortunate, this is the only interpretation of this rule I can come up with.
Can you quote the rule stating that you "must" use a vertical pool noodle on the corners? I've looked and can't seem to find it anywhere...
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Unread 11-01-2008, 12:00
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Re: Bumper Rule

Quote:
Originally Posted by eagle33199 View Post
Can you quote the rule stating that you "must" use a vertical pool noodle on the corners? I've looked and can't seem to find it anywhere...
There is nothing requiring that a vertical pool noodle be used in the corner, but because the only thing that can be used in the corner is a pool noodle or cloth piece of bumper (and not wood, or other "hard" materials), most teams cut a pool noodle the height of a bumper and stand it up in the corner.

Figure 8-2 on page 10 of THE ROBOT shows exactly the scenario I am describing in the top left corner of the view of the robot on the left.

Quote:
"If needed, a pool noodle corner can be wrapped into bumpers - but only pool noodles & cloth may penetrate corner space"
And lower left on the image....
Quote:
"hard" bumper parts do not extend into the corners."
Basically what this is saying is that you can not "miter joint" the wood going around your robot behind your bumpers.

I'll try and get a good picture of what we have done and has been accepted in the past with these rules (which have not changed much, if any over the years of bumpers - other than the REQUIREMENT to have them this year as opposed to previous years.
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Last edited by Elgin Clock : 11-01-2008 at 12:04.
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Unread 11-01-2008, 12:07
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Re: Bumper Rule

Quote:
Originally Posted by JesseK View Post
... you may place a vertical pool noodle to soften the corners of the side or front bumpers such that it covers the corner.

The extra vertical pool noodle that isn't part of the STANDARD bumper cannot count toward the minimum 6 inches. Though it is unfortunate, this is the only interpretation of this rule I can come up with.
Fixed your post.

The note in Figure 8.2 says, "if needed, a pool noodle corner can be wrapped into bumpers - bou only pool noodle and cloth may penetrate the corner space"
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Unread 11-01-2008, 13:00
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Re: Bumper Rule

Yea my bad. The point of the post was to clarify that the vertical pool noodle isn't part of a standard bumper by definition, therefore the vertical pool noodle should not be used in the 6" minimum dimension. I've thought about this several times due to the fact that our team this year is going with an open-front design and due to the nature of the bumper rules we unfortunately cannot have bumpers on the front, at all.
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Unread 11-01-2008, 13:01
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Re: Bumper Rule

Heres a quick question:

What if one were to put bumpers on their robot in such a way that they fit all regulations and made contact within the bumper zone, but also extended below the 2.5" mark??
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Unread 11-01-2008, 13:07
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Re: Bumper Rule

If it was below 2.5" it would not fit regulations.
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Unread 11-01-2008, 16:11
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Re: Bumper Rule

Quote:
Originally Posted by Sunshine View Post
Another question and answer on bumpers just for clarification.

Rules say that bumpers need to 2 1/2 inches from floor and 5" tall. What if I do not want a chassis that is 7 1/2" tall from the chassis? I'm assuming that I can have the bumpers above the chassis walls/sides if I want. Is this correct?

I may have to go to Q&A on FIRST.
Here is something to keep in mind for mounting bumpers in general, but especially on shorter bots:

Make sure that your standard bumpers can simply and securely attach to your chassis in the bumper zone with reasonably sized fasteners. Incorporate the bumpers into your design, don't wait till the last minute to to find a way to attach them.

As an inspector last year, I saw 1 or 2 teams that needed some sort of metal bracket to fit the bumpers in the right place vertically. The teams thought these brackets would be counted in the weight of the bumper, but the brackets are part of the chassis and counted against the weight (and size) of the robot. Many other teams simply mounted the bumpers several inches outside of the bumper zone (between 2.5" and 8.5") because that was where it fit easily on their chassis.

With bumper requirement this year many teams will be building them for the first time. Don't make bumpers an afterthought because unlike last year you can't just take them off if they don't meet requirements.
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Unread 19-01-2008, 08:24
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Re: Bumper Rule

Our design calls for bumpers around the entire perimeter of a rectangular shaped robot and our design is such that the bumpers could be constructed (fastened together) as a single assembly with with either an overlap of the plywood in the corners and/or an angle bracket behind the plywood in the corners. If we did an overlap of the plywood in the corners would be be violating the no hard part of the bumpers may extend into the corners rule? If we rounded the outside corner of the plywood overlap so that no hard part of the bumper extends more than one inch beyond the robot frame would we be violating the rule? If we left the plywood completely out of the corners and fastened the segments together with an L bracket from behind would we be violating the rule?
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