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#16
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Re: Mecanum Drive - Help
With a mecanum drivetrain is driving sideways (along the Y axis below), there are four force vectors (one from each wheel) directed at 45 degree angles:
The Y components of the force vectors make the robot move in the Y direction, and are each equal to sin(45)*F=0.707*F. The X components, which are also equal to .707*F, cancel each other out. Therefore, the robot will have .707 the force driving its sideways movement as it will driving its forward movement. |
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#17
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Re: Mecanum Drive - Help
Now draw the diagram again for the situation where the drivetrain is moving forward. I think you'll find the resulting vectors will add up to something surprising.
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#18
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Re: Mecanum Drive - Help
Quote:
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#19
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Re: Mecanum Drive - Help
Quote:
It is also possible that buying in advance makes sense if your currency is high vs. the US dollar. I wish I had paid our entry fees and bought a couple super shifters a month ago... the team would have saved about $1,000 compared to the cost of those items today. As for a discussion of the technology, or hearing from teams that have used it, there are numerous threads that you can find by searching the forums. I have posted regarding our team's (positive) experience with mecanums (and the challenges we faced by choosing to use them) to this thread. Try searching for "mecanum", "meccanum", or "mechanum" as those are common mis-spellings of the word. There is also a great entry on mecanum in wikipedia with links to videos of forklifts and manlifts using the technology. Jason P.S. Some video of our robot and R&D is on line. Last edited by dtengineering : 04-12-2007 at 11:53. Reason: P.S. |
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#20
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Re: Mecanum Drive - Help
One point to throw out there is that mecanum robots still have a really hard time against a defensive robot. Even with a driver who uses the side to side motion well its still very hard to avoid defense. Also you are not going to win any pushing battles. But so far I have only seen a few robots who are able to score well with a defensive bot on them.
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#21
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Re: Mecanum Drive - Help
If you absolutely had to lock in your drivetrain right now during the preseason, I'd say do not go with mecanum. Do not even consider it. A game like 2006 where a mecanum could be pushed from scoring very simply would be terrible. Even more terrible would be a 2002/2003esque game.
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#22
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Re: Mecanum Drive - Help
Just because someone has Mecanum wheels does not mean that they can't play defense or push. I am a part of team 357 who had the jester drive system. We had this drive train in 2006 and became a defending robot by pushing. Depending on how well they are designed, Mecanum wheels can also be extremely good at climbing inclines. In 2006 again we made it up the ramp easily, which was often better than the teams we were playing with/against.
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#23
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Re: Mecanum Drive - Help
Thanks for all the help!
I feel I need to clarify a few things: 1. The Mecanum Drive is only one of three driving methods our team is testing before the kickoff. We will decide which one to use after deciding the strategy. 2. Note that overseas shipping will be involved (to Israel). Nevertheless, all the things said will be taken into consideration when deciding this year's drive method. Thanks again! Tal Saiag #1943 "Neat-Team" |
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