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Unread 11-01-2010, 13:37
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Changing bumper colors

<R07>:
Quote:
H. BUMPERS must be designed for quick and easy installation and removal, to aid in weighing and inspection (as a guideline, BUMPERS should be removable by one person in less than ten minutes).

But,
Quote:
<T13> At the conclusion of a MATCH, all players shall remain in their assigned locations until the Head Referee issues the “field-reset” signal. Once the Head Referee issues this signal, the 3-minute “match-reset” period will begin. The ARENA must be cleared of ROBOTS from the MATCH just ended, and the ROBOTS and OPERATORS CONSOLES for the following MATCH must be placed in position and ready to start before the expiration of the “match-reset” period. Field Attendants will reset the ARENA elements during this time.
And,
Quote:
<T20> During the elimination rounds, if circumstances require an ALLIANCE to play in back-to-back MATCHES, they will be granted an additional minute of set-up time to reset and allow their ROBOTS to cool down.
(all emphasis mine)

Sometimes during the eliminations, alliances switch from being red to blue or vice versa, and have to play back-to-back. You'd better be able to change your bumper colors in 4 minutes or less.
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Last edited by GaryVoshol : 11-01-2010 at 13:41.
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Unread 11-01-2010, 13:43
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Re: Changing bumper colors

I recommed ball lock spring pins. Zero to bumper in 15 seconds.

http://www.mcmaster.com/#pins/=5bx5nm
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Unread 11-01-2010, 16:24
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Re: Changing bumper colors

Quote:
Originally Posted by Peter Matteson View Post
I recommed ball lock spring pins. Zero to bumper in 15 seconds.

http://www.mcmaster.com/#pins/=5bx5nm
Has your team used this or is it just an idea? If used, how many on, let's say, the long side? How well did it hold up during the season?
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Unread 11-01-2010, 16:54
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Re: Changing bumper colors

Quote:
Originally Posted by johnr View Post
Has your team used this or is it just an idea? If used, how many on, let's say, the long side? How well did it hold up during the season?
We used 6 (six) to hold on all bumpers last year. One at each corner and one on the inside of each short section across the font. Also our bumpers were essentialy continuous fabric around the perimeter to help.

I think no more than 2 a side are necessary and if you use the same one in the corner to hold 2 sides as we did last year 4 total is all you need this year.
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Unread 11-01-2010, 17:36
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Re: Changing bumper colors

We've used these for a few years now. We tend to use three on each long side.
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Unread 12-01-2010, 07:25
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Re: Changing bumper colors

Quote:
Originally Posted by Peter Matteson View Post
I recommed ball lock spring pins. Zero to bumper in 15 seconds.

http://www.mcmaster.com/#pins/=5bx5nm
Quote:
Originally Posted by johnr View Post
Has your team used this or is it just an idea? If used, how many on, let's say, the long side? How well did it hold up during the season?
Quote:
Originally Posted by Peter Matteson View Post
We used 6 (six) to hold on all bumpers last year. One at each corner and one on the inside of each short section across the font. Also our bumpers were essentialy continuous fabric around the perimeter to help.

I think no more than 2 a side are necessary and if you use the same one in the corner to hold 2 sides as we did last year 4 total is all you need this year.
We used the same thing on 1189 and 3096's bots last year. In my opinion using any other method is a waste of time. Between the two bots the system had ~88 matches of use and during that time no pin ever was dislodged past the ball lock. Let's face it... stuff doesn't fall up. Of course in Breakaway up could vary from moment to moment, but I'm planning to use these pins again anyway.

The specific part number was McMaster-Carr (p/n 98320A140)

They should also mate with AndyMark's bumper brackets AM-0317
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Last edited by kramarczyk : 12-01-2010 at 07:32. Reason: added part number
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Unread 24-01-2010, 16:17
TubaMorg TubaMorg is offline
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Re: Changing bumper colors

Our team has, for some reason, been unable to figure out an elegant solution to mounting our bumpers the last few years. I really like this solution, BUT I am unsure how it is implemented (along with the AM brackets) to avoid the 1" hard parts rule. Our understanding is that with the 3/4" plywood, you only have 1/4" left for bolts/brackets etc. which appears to us to eliminate fastening systems other than what is very similar to what is shown in the manual.

Quote:
Originally Posted by kramarczyk View Post
We used the same thing on 1189 and 3096's bots last year. In my opinion using any other method is a waste of time. Between the two bots the system had ~88 matches of use and during that time no pin ever was dislodged past the ball lock. Let's face it... stuff doesn't fall up. Of course in Breakaway up could vary from moment to moment, but I'm planning to use these pins again anyway.

The specific part number was McMaster-Carr (p/n 98320A140)

They should also mate with AndyMark's bumper brackets AM-0317
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Unread 24-01-2010, 17:33
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Re: Changing bumper colors

Quote:
Originally Posted by TubaMorg View Post
I am unsure how it is implemented (along with the AM brackets) to avoid the 1" hard parts rule. Our understanding is that with the 3/4" plywood, you only have 1/4" left for bolts/brackets etc. which appears to us to eliminate fastening systems other than what is very similar to what is shown in the manual.
The 1" is measured outward from the frame perimeter. Bumper fasteners can extend into the robot without being subject to that measurement.
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Unread 24-01-2010, 18:09
TubaMorg TubaMorg is offline
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Re: Changing bumper colors

Excellent, thanks Alan. R07.N confirms your point.
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Unread 11-01-2010, 13:45
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Re: Changing bumper colors

Quote:
Originally Posted by GaryVoshol View Post
<R07>:


But,

And,(all emphasis mine)

Several times during the eliminations, alliances switch from being red to blue or vice versa. You'd better be able to change your bumper colors in 4 minutes or less.
Are you fishing for questions? Such as, what if we build two sets of bumpers, one red - one blue? Would they have to be weighed in together, and weigh less than 20 pounds combined?
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Unread 11-01-2010, 13:51
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Re: Changing bumper colors

In the rules <R07> they clearly say you can have 2 sets of bumpers at 20 lbs each. IMO take advantage of the rule and make 2 sets and do a quick change.
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Unread 11-01-2010, 13:54
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Re: Changing bumper colors

Quote:
Originally Posted by Jack Jones View Post
Are you fishing for questions? Such as, what if we build two sets of bumpers, one red - one blue? Would they have to be weighed in together, and weigh less than 20 pounds combined?
No. He's saying that bumper color will need to be changeable within 4 minutes because of the field reset rules.
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Unread 11-01-2010, 14:40
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Re: Changing bumper colors

These new bumper changing things are going to be pretty neat.
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Unread 11-01-2010, 17:38
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Re: Changing bumper colors

Quote:
Originally Posted by iqjavier View Post
These new bumper changing things are going to be pretty neat.
I think it is going to be a pain in the butt...
I dont like the fact that we have to change such a large component of our robot to indicate our team color. I kind of wish that they would do something else for that purpose.

In the past, our teams bumpers have been pretty much permanant...The only times we ever had to take them off was to weigh the robot, and to get it to fit into the crate for shipping...

Now we have to change them almost every match? that just seems a bit rediculous...

I COMPLETELY do not trust bumper covers. They seem too easy to remove, no matter HOW you design them...I dont think that capability is worth the chance of a penalty
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Unread 11-01-2010, 18:14
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Re: Changing bumper colors

does anyone know which blue is required for the bumpers?
I called Seattle Fabrics and they have 2 types: Royal and Navy Blue.
Im thinking it doesnt matter, but just wanted to make sure.

When we asked, teams that called earlier didnt know and they themselves have not been told by FIRST if it had to be a specific one.
Dont want to base it from the video and the video alone.
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