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Robot chassis shape
I saw an old closed thread about the shape of robots' frames, and I was just wondering what was considered best particularly for robustness. Is a simple rectangular bot good, or a more abnormal looking robot best? Also what are the downsides to each shape.
One of the old posts talked about how the shape shouldn't be designed, but that it should just sort of evolve with you robot's creation. How about it? There are many robots out there. Which shape is best for robustness, compatability, and effeciency in electrical organization and drive trains? |
Re: Robot chassis shape
Honestly, it depends on your robots' functionality. The most common top-down shape is rectangular, but if you feel that your robot needs a different shape for your auxiliary to perform better, then by all means, go ahead, as long as you don't sacrifice your machine's stability and structural strength.
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Re: Robot chassis shape
It depends on your desired role.
For offensive robots, 179 in 2005 had it about figured out--it was harder to catch a corner and stay on it. For defensive robots, we (being 1293) learned in 2006 that our ball intake was good for catching the aforementioned corners when we had to play defense. |
Re: Robot chassis shape
Our Vex team tried using a Triangular shape for their robot. While our mentors thought it was a revolutionary concept (being more difficult to block and easier to control), it ended up simply being a hinderance. The team agreed the triangular shape made it harder to center and attach parts.
The odd shape design could potentially be a good idea, but only after it's been worked on extensively. Otherwise it's just for show. |
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For those of us who have limited experience in FIRST, could you please post links to pictures of what you're discussing?
Much appreciated, -MT |
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I saw a team in Atlanta this year (can't remember the number, I think in the 900s, but can't recall right now) that I was very impressed with. They started with a rectangular base with rounded edges on the front and back and had two drop down sides that fell so it became a complete, uniform circle at about 3 inches off the ground. All the way around they had rollers so whenever a team tried to play defense on them they still could turn and do things that way without any issues... plus if the other team hit them at any angle but straight on they would "slide" around the robot. The driver said the added maneuverability it gave was amazing, and overall it's a very simple thing to create mechanically. Very, very cool idea and I wish I had a photo or the actual team number that did that. Definitely something to put in the memory banks for future years :)
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The Blue Alliance has all but one match from GSR (and 95 isn't wasn't in that match). |
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Our chassis: http://www.chiefdelphi.com/media/photos/27019 Swamp Thing 2005: http://www.chiefdelphi.com/media/photos/20152 |
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As far as shape is concerned, you also have to keep weight in mind. In 2006, my team designed a great looking, extremely strong frame, but it ended up being super-heavy. *Shivers* so many holes... |
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Well, while a rectangular shape may give you the most space, you have to ask yourself: do you really need it? I know that my teams robot next year is going to take a very minimalist approach. (I'll be a mentor, but I shall *help* with a iron fist! :cool: )
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We used it this year on our robot, but I was wondering if anybody else used stressed analysis to help design a chassis that could take the blows of defensive competition.
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We did some... http://www.chiefdelphi.com/forums/sh...53194&p=569665
Coming up with the load cases was the hard part. We just ended up using a relative comparison. Now that I'm aware of the IRI definition for high speed ramming I've got something solid to work from. :D |
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