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drive train
where can i find info on drive trains?
i have been assigned the tentative drive train captain for this year and for the past two years have usually been on the other design teams (manipulator, ball picker upper, etc). Anyhow, i don't know a whole lot about FIRST drivetrains although i understand torque and basic physics principles. i just need some guidence and any tips and tricks on designing and building drive trains for a FIRST robot. thanks alot |
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James |
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Here are some transmission prints. Formally used at tkat transmissions.
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I believe this is the powerpoint that JamesBrown is talking about.
Also you may find these whitepapers useful: http://www.chiefdelphi.com/media/papers/1705 http://www.chiefdelphi.com/media/papers/1443 |
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The gallery of photos maintained by the FIRST Robotics Canada folks is pretty helpful, too. There's not much exposition, but looking at the pictures can show you a lot about the practicality of implementing certain ideas.
http://www.firstroboticscanada.org/site/resources |
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I always find the Chief Delphi white papers useful. There is a link to them on the portal page. You can search through a bunch of different transmission ideas and designs. No matter how many times you built and designed a bot in never gets old. Good Luck with your search and this coming season.
-Drew |
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thanks guys
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753 has racked up a bit of a record on the strength of our drivetrains. Last year we won the PNW regional and went to nationals, where we took a divisional third along with 254 and 71. We did it on the strength of our drivetrain; our scorer hardly worked at all but we could guarantee to stop other bots from scoring. 254 knew it was a very strong complement to their scoring, and they drafted us in PNW and at nationals. This year we're pleased to partner with our sponsor, Outback Manufacturing, to make our award-winning drivetrain available to other teams. Outfitted with a 2-speed transmission, the 'train can go 17 FPS in high gear, and in low has more pushing power than last year's bot! Because of the lead time to do with the belts from Breco-flex, we need to know whether you're doing it pretty soon so you can get the belts early in the season. Email me at ari.allynfeuer@gmail.com or use a forum PM to talk about it. Ari. |
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For speed: high gearing with any transmission/wheel pattern will work, if you do your calculations right. For maneuverability: 2-wheel, 6-wheel with a dropped center, swerve, or mecanum are your basic options. You want to avoid using swerve and mecanum until you have explored them. Some teams make these look easy, but they aren't. Power: low gearing with anything, but no speed. Tank treads: Be careful. One tread comes off, you are disabled for the rest of the match. You have to design right for treads. Bottom line: Explore a bit. If you are a rookie, you should be somewhat conservative on complexity. After that, explore all the options you like. Do the power curves to find out what the trannies will behave like. Try shifting. |
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Can you explain more about the mechanism your team has in place to comply with FIRST's rules defining what a vendor is? |
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These kind of delays are not an unfamiliar prospect to FIRST teams or any other intercorporate purchasing arrangement, and the rules from 2006 (And, it is safe to assume, 2007) allow for the delays inherent in this kind of thing. Would you say Breco-Flex is not a Vendor? What we're trying to do is simplify the insane free-for-all of custom ordering from Breco-Flex that goes on. To make it easier for Breco-Flex by using a single size, and to make it easier for the teams by reducing the lead time by keeping the tracks in stock. Outback is an established manufacturing shop with all the requisite tax numbers, and the delays are the result of a third-party supplier which is an official FIRST supplier. We don't anticipate any rules issues. Thanks, Ari. |
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