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-   -   New size/bumper rules that every team should know (http://www.chiefdelphi.com/forums/showthread.php?t=153134)

maths222 08-01-2017 19:31

Re: New size/bumper rules that every team should know
 
Quote:

Originally Posted by PantherRobotics (Post 1627422)
Very frustrated with FIRST right now. We choose to get the Andmark base kit with our kit of parts. If we try and use volume choice B with the 36" height we cannot use the andymark kit. Basically it invalidates a $450 part. Look at the wheel spacing, size of wheels, and gear belts and the locations for pre drilled holes. Unless I am incorrect the only sizing you can use and make that chase kit work is Volume A

Unless I am mistaken, it appears that you could build a hybrid of the "Wide" and "Long" configurations, where you cut the inner and outer plates to the "Wide" configuration and cut the end plate and churro to the "Long" configuration. This would give a 23.5"x24.3" base, which is just small enough to allow for bumpers. and still fit within a 30"x32" volume.

Hadi379 08-01-2017 19:59

Re: New size/bumper rules that every team should know
 
Quote:

Originally Posted by one4robots (Post 1627296)
Steve,
I noticed this, too. There will be a LOT of balls on the field, so a low profile robot will be beneficial in navigating through all the balls. Our team will likely have bumpers as low as possible. An added benefit of low profile is more volume up top to use for storage, etc.
Vince

Quote:

Originally Posted by Steven Carmain (Post 1626682)
New this year,the top of the bumpers is 7" this year (think bumpers end up 5.5-6.5" tall with fabric. My memory says last year the bumper zone was 5-12" off the ground.

R23. BUMPERS must be located entirely within the BUMPER ZONE, which is the volume contained between the floor and a virtual horizontal plane 7 in. (~17 cm) above the floor in reference to the ROBOT standing normally on a flat floor.

Theoretically, doesn't this mean the floor is the bumper zone's lower limit, and therefore a team could have bumpers that drag along the carpet?

Also, for some reason, maybe due to defense, a robot with very low clearance due to bumpers gets popped up off their wheels and lands on a game piece could become stuck very easily.

Am I seeing this right?

engunneer 08-01-2017 20:04

Re: New size/bumper rules that every team should know
 
Quote:

Originally Posted by Hadi379 (Post 1627456)
R23. BUMPERS must be located entirely within the BUMPER ZONE, which is the volume contained between the floor and a virtual horizontal plane 7 in. (~17 cm) above the floor in reference to the ROBOT standing normally on a flat floor.

Theoretically, doesn't this mean the floor is the bumper zone's lower limit, and therefore a team could have bumpers that drag along the carpet?

Also, for some reason, maybe due to defense, a robot with very low clearance due to bumpers gets popped up off their wheels and lands on a game piece could become stuck very easily.

Am I seeing this right?

yes, that's how i read it. teams should test how their robot functions in the event it gets stuck on fuel or gears. I was hoping the bumpers could get high enough that a gear passes under , but that's not quite possible.

Munchskull 09-01-2017 00:19

Re: New size/bumper rules that every team should know
 
Quote:

Originally Posted by engunneer (Post 1627461)
yes, that's how i read it. teams should test how their robot functions in the event it gets stuck on fuel or gears. I was hoping the bumpers could get high enough that a gear passes under , but that's not quite possible.

Go low enough that gears and balls are pushed out of the way.

MattRain 11-01-2017 00:53

Re: New size/bumper rules that every team should know
 
Bumpers ARE included in the Robot Volume.

https://firstfrc.blob.core.windows.n...amUpdate01.pdf

Robopromo 12-01-2017 14:51

Re: New size/bumper rules that every team should know
 
Quote:

Originally Posted by Joe G. (Post 1626513)
Two subtle changes to the rules that have huge impact, and the potential to really hurt some teams if they're not careful.



The first big change: Bumpers are now included in the robot size limit. This means that your physical robot must take into account the ~3.25" on each side a bumper will take up, but also take into account the fact that bumpers are soft, squishy, and tend to shift, and are probably not as dimensionally reliable as what we're used to using as a frame perimeter defining part. Leave extra room, and don't forget the bumper size entirely.

However, bumpers must still be removed for inspection so that the robot can be weighed. So don't make them 100% integral to the frame just yet.

The second, more subtle change. For the first time since 2009, the robot is limited to the same size in its starting configuration as during the rest of the match. However, the rule is not the same as the 2009 rule. 2009 was frame perimeter based, and banned any extension over the starting perimeter. If you chose to be small, you were stuck small.

This year, however, it's a fixed maximum size. If you want to reach over the bumper to expand your intake, grab a rope, or anything else, you can do this, but only if your base/frame perimeter is smaller than the maximum size. Say, for example, you choose the 36"x40"x24" size. A drive base/bumper assembly built at 36"x40" cannot have a drop-down intake of any sort, and will be constrained to a bumper-cutout intake with 6" on each side (another change, down from 8"). However, if the team instead builds their bot 36"x30", they have a full 10 inches outside of the bumper to extend and build anything they want. This mechanism must still retract due to <R02> for the start of the match.

Plan your drive base carefully. Bigger is not necessarily better, and may lock you into a design and prevent you from duplicating something cool you see at a first event.


Here's a couple helpful ways to make sure your bumpers are put together well, which will make it possible to get all the space out of them that you'll need:http://www.robopromo.com/category_s/1826.htm

Another thing mentioned that is very important is an easy way to take the bumpers on and off. We came up with a solution for this last year and here's a link to that video: http://www.robopromo.com/category_s/1832.htm

There's lots of videos that'll help you construct good bumpers if you check out Bumper School


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