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View Poll Results: Mecanum or 6WD
Mecanum 90 40.36%
6WD 133 59.64%
Voters: 223. You may not vote on this poll

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Unread 09-01-2011, 21:09
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Re: Mecanum or 6WD

Is there any method way to increase traction of a mecanum drive system?
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Unread 09-01-2011, 21:18
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Re: Mecanum or 6WD

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Originally Posted by Charmander View Post
Is there any method way to increase traction of a mecanum drive system?
Last year i think team 190 had a method in which they locked the rollers of their mecanum wheels effectively turning them into regular wheels. Can anyone from team 190 double check me on this?

I have also seen some examples of rovers which had the ability to switch from mecanum to regular wheels. They looked like an 8 wheeled robot that could lift its outer wheels.

Last edited by Mark Sheridan : 09-01-2011 at 21:19. Reason: clarify
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Unread 09-01-2011, 22:09
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Re: Mecanum or 6WD ...we're leaving something out

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Originally Posted by Charmander View Post
Is there any method way to increase traction of a mecanum drive system?

In the Andy Mark type you can tighten the roller bolts to put friction on the roller so you can have a bit more "traction" but you'll sacrifice ...probably a bit of speed in other directions. I also depends on the co-efficient of friction of the rollers.


OKAY... A PROBLEM WITH THIS DISCUSSION. Mechanum are NOT that easy to push around. If you mean a 6WD trying to push a mechanum bot.... it's a TIE... DEPENDING ON... something people have not mentioned. Do you mean a 2 motor 6WD or a 4 motor 6WD... A European Swallow or an African Swallow?
Mechanums are all about understanding the vectors of the wheels and without needing to put numbers in... in any given direction, mechanums are the equivalent of the torque of TWO motors driving TWO wheels with the rollers locked. (Remember all mechanum drives are 4 motors unless you have a REALLY elaborate nightmarish power distribution system!)
When you push a regular robot sideways, you are trying to overcome the sideways wheel contact with the floor so co-efficient of friction is the major factor. Anytime you contact a mechanum, you are contacting it "head on". The driver can elect to drive into you and push back until the wheels slip... co-efficient of friction again. I think the real issue is the number of motors you have to burn up with mechanums. You need 4 for a mechanum while you can have a nice 6wd for only 2.

In the end, either is a good choice.


Steve
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Unread 10-01-2011, 12:01
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Re: Mecanum or 6WD

Main reason (as of day 2 of the build) for not doing a Mecanum drive, the work best when each wheel has an equal force on it (weight) the fact that we will be moving arms (or something) around to score will be shifting that weight, admittedly that will be in a "safe" zone. But while on the field these shifts can lead to chaotic motions from a Mecanum drive.

But the drive isn't *completely* off the list yet , but 6 wheel is easy, light, inexpensive, easy to program and drive, predictable, robust, able to run while damaged and we tend to have better years when we use 6WD
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Unread 09-01-2011, 21:25
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Re: Mecanum or 6WD

My team will be using mecanum because of the lateral-motion factor, which will be critical in maneuvering to hang a logo piece, as detailed below.

Process of acquiring and scoring a tube:
6WD:
1. Get tube from feeder.
2. Zip across field to scoring zone, using superior speed and traction to avoid other robots.
3. Advance to hang tube. Miss.
4. Back up, adjust angle, try again. Miss.
5. Repeat. Miss. Waste 20+ seconds on a single tube before finally succeeding.

Mecanum:
1. Get tube from feeder.
2. Drive across field to scoring zone, strafing around opponents.
3. Advance to hang tube. Miss.
4. Strafe to quickly align tube. Succeed.
5. Repeat 1-4. Achieve massive victory.

Realigning a 6WD robot to hang a tube involves backing off less than 7 feet (so as to avoid opponents), turning a bit, driving forward a bit, turning back a bit, and then finally reattempting the hang. Whatever advantage you had in zooming across the field has been lost in your inability to quickly and accurately hang a piece.

While 6WD will be good at defense, mecanum, omni, and swerve will rule at offense.
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Unread 09-01-2011, 21:54
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Re: Mecanum or 6WD

If one can make a robot orientation independant hanging device, then there is no reason for mechanum. If not, then there is a compelling one, atleast for robots who take on a main scoring position of the team.
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Unread 09-01-2011, 22:47
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Re: Mecanum or 6WD

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Originally Posted by Grim Tuesday View Post
If one can make a robot orientation independant hanging device, then there is no reason for mechanum. If not, then there is a compelling one, atleast for robots who take on a main scoring position of the team.
What is that compelling reason? I'm not seeing it.
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Unread 09-01-2011, 22:06
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Re: Mecanum or 6WD

I think good driving will rule at offense. Mecanum will certainly have advantages, but for a well-driven 6WD robot there will likely not be much backing off, turning, advancing, backing off...any more than mecanum will be strafe left, strafe back to the right, back to the left,... It will be more like get into approximate position and pivot left or right in place. We saw this with more than a few robots in 2007. In fact we saw a number of robots better at approaching the rack from other than a 90 degree angle.
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Unread 09-01-2011, 22:28
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Re: Mecanum or 6WD

Quote:
Originally Posted by Joe Schornak View Post
Realigning a 6WD robot to hang a tube involves backing off less than 7 feet (so as to avoid opponents), turning a bit, driving forward a bit, turning back a bit, and then finally reattempting the hang. Whatever advantage you had in zooming across the field has been lost in your inability to quickly and accurately hang a piece.
True, but robots are just over 3' long (at most), so they've got essentially gobs of room to back up to readjust. And a good driver (potentially with tracking software help) will get "close enough" most of the time, considering the 9.5" - 12" opening of the tubes and the 2-3/4" size of the retention plate on the pegs.

Team 811 is just starting the 6WD vs. Mechanum (vs. Holonomic) debate; it's interesting to watch, considering we've never built either
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Last edited by Mr_I : 09-01-2011 at 22:34. Reason: Corrected the size of the retention plate dimension
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Unread 09-01-2011, 22:42
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Re: Mecanum or 6WD

Do any of you predict that there will be tubes on the ground? It seems unlikely because teams are not able to take tubes from opposing team robots. If each robot gets control of tubes from the feeding sites, virtually no tubes will be "up for grabs". This is a huge factor in deciding whether to go Mecanum or 6WD because if there is a lot of travel back and forth from feeders to pegs, 6WD would be preferred. However, if there are tubes in the middle of the field, i feel that mecanum will be more usefull since they are able to pick up tubes and travel a shorter distance to the pegs.
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Unread 09-01-2011, 22:46
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Re: Mecanum or 6WD

Our team just finished discussing this problem today. We went with 6WD. Why?

Motor Consumption.

There was talk about Maneuverability and Torque and Strafing and Speed. But here's what it came down to:

We wanted our arm to be able to get into whatever position we wanted as fast as possible.


Now, speed is irrelevant because whether you have two CIMs or 4 CIMs running your drivetrain, you will go the same speed. Obviously.

Maneuverability IS what you are losing here. But consider this. You can teach a driver how to be more accurate, with more practice comes greater accuracy. No matter how much the robot practices, it will not get faster. Plus, the built "Safe Zones" in this game are so frequent it's like you're playing match mode on "Easy". If you can get into the safe zone...does it matter? Also, when you're positioning a tube in close range, does it really matter with no defense which is faster?

Torque really doesn't matter much this year (IMO, and for our strategy), so more motors aren't a necessity.

Now teams operate in different ways so there really isn't one answer for this. Our team has never done a mechanum drive before. As easy as it may be, we can build a 6WD with our eyes shut. Also, this year's game is screaming "Mechanum/Crab/Swerve". Might it be easier to outmaneuver a sea of multi-directional drivetrains with something you're more familiar with? In 2007 we had a problem with our arm motor and had to use the big CIM (thank god it was available) to compensate. I think you really need to prioritize what you REALLY want to accomplish in this game and go for that first.

There are VERY few teams that can play "God-Bot"
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Unread 09-01-2011, 22:59
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Re: Mecanum or 6WD

Quote:
Originally Posted by Joe Schornak View Post
Process of acquiring and scoring a tube:
6WD:
1. Get tube from feeder.
2. Zip across field to scoring zone, using superior speed and traction to avoid other robots.
3. Advance to hang tube. Miss.
4. Back up, adjust angle, try again. Miss.
5. Repeat. Miss. Waste 20+ seconds on a single tube before finally succeeding
That's interesting reasoning. How did you come up with this assessment? We haven't been able to test it with old bots yet, but by contrast tank drive was the norm for effective hangers in '07. And that was with a free-swinging rack with much larger end caps. The flat scoring grid does highlight lateral motion somewhat, but I wouldn't think it was that much at first estimate. In both cases, a lot of its down to drivers and sensors. Best case: do not let go unless you know it'll hang.

Steve: Good point; motors and frictional coefficients rule the game here. But correct me if I'm wrong, even if 6wd and mecanum tie the motor battle (i.e. a 2 motor 6wd), mecanum still loses on the coefficient front.
- AM Mecanum Wheel values (static forward/reverse, sideways): 0.6 and 0.5 (6"), 0.7 and 0.6 (8"), 0.54 and 0.41 (10").
- AM Traction Belt values: 1.2 (wedgetop), 1.3 (roughtop)
Even dropping the 6wd center, you're still looking at double or more the mu's.
Purely anecdotal: I've never seen a mecanum win a pushing war against a reasonable tank drive, 6 wheel or otherwise. In fact, in 4 years behind the alliance station glass, I can't think of (m)any that tied either.

Charmander: Expect tubes on the ground. There is 1 very important rule in the world of FIRST game pieces: no matter what they are, no matter where they start, no matter where they're going, significant numbers will end up pushed against the wall on the floor. This year, I'd predict lot of that happening from robots dropping and human players throwing. No all-star team is going to show up at competition without very well-exercised human players. Why go all the way to the store when you can get them air-mailed?
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Unread 09-01-2011, 23:08
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Re: Mecanum or 6WD

Siri: Then would you be in favor of Mecanum? The 360 directional maneuverability of the drive system will be "pwnage" when picking up tubes and placing them on pegs?
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Unread 10-01-2011, 00:34
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Re: Mecanum or 6WD

Quote:
Originally Posted by Siri View Post
T

Steve: Good point; motors and frictional coefficients rule the game here. But correct me if I'm wrong, even if 6wd and mecanum tie the motor battle (i.e. a 2 motor 6wd), mecanum still loses on the coefficient front.
- AM Mecanum Wheel values (static forward/reverse, sideways): 0.6 and 0.5 (6"), 0.7 and 0.6 (8"), 0.54 and 0.41 (10").
- AM Traction Belt values: 1.2 (wedgetop), 1.3 (roughtop)
Even dropping the 6wd center, you're still looking at double or more the mu's.
Purely anecdotal: I've never seen a mecanum win a pushing war against a reasonable tank drive, 6 wheel or otherwise. In fact, in 4 years behind the alliance station glass, I can't think of (m)any that tied either.

)
I was mostly on the theoretical plane. Still, not everyone uses the Andy Marks wheels. It IS possible to make your own Urethane Mechanums and come closer to the traction belt co-efficients. For that matter, replace the rollers on the AM mechanums with a urethane roller... but I'm too lazy. Even so, the mechanums are usually not intended for a pushing battle. I think it was mentioned earlier that the ability to escape and maneuver are more in line with the mechanum strategy. Wheels have been around since Roman times, Mechanums are relatively recent. I have a plan for a different mechanum but I think I'll skip on re-inventing the wheel. I just need an escape plan from the people who will tell me I'm crazy for building it.... I also have a plan for locking the wheels on a mechanum but have never bothered to build it. No one can have their cake and eat it too.

Such is life and then you die.

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Unread 09-01-2011, 23:26
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Re: Mecanum or 6WD

Quote:
Originally Posted by Joe Schornak View Post
Process of acquiring and scoring a tube:
6WD:
1. Get tube from feeder.
2. Zip across field to scoring zone, using superior speed and traction to avoid other robots.
3. Advance to hang tube. Miss.
4. Back up, adjust angle, try again. Miss.
5. Repeat. Miss. Waste 20+ seconds on a single tube before finally succeeding.
Have you actually tried to hang tubes with a 6wd base before? It is a lot more forgiving than you are implying; there's not much need for precision.
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