Chief Delphi - 2015: Year of the Mecanum

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Chief Delphi (http://www.chiefdelphi.com/forums/index.php)

- General Forum (http://www.chiefdelphi.com/forums/forumdisplay.php?f=16)

- - 2015: Year of the Mecanum (http://www.chiefdelphi.com/forums/showthread.php?t=131913)

Robo Hamsters

03-01-2015 22:47

Re: 2015: Year of the Mecanum

Quote:

Originally Posted by TheJoe (Post 1419636)

we don't need the large, defensive powerhouse that FRC generally sees.

This is actually our dilemma as our first 2 years we built extremely strong defensive drive bases first and then concentrated on offensive capabilities.

So we are now working on our strategy to switch to an all offensive bot.

Good luck everyone!

oison75

04-01-2015 17:19

Re: 2015: Year of the Mecanum

Our team is also considering using a mecanum drive train. We have never used mecanum before, but we firgured we have lots of resources to lean on and using mecanums will be very adventageous. Any suggestions for drive train layout, gearboxes, motors, bearings, etc? Also where're the best places to purchase mecanum wheels, I've only seen the Andy Mark ones and Vex ones... are those good? I'm extremely excited to start playing with a mecanum robot, but an also very nervous since our team is new to mecanum... Any suggestions?

mfalk

04-01-2015 21:40

Re: 2015: Year of the Mecanum

We used mecanum on our Rebound Rumble robot and had only slight problems getting on the bridges and that angle was much greater than 16-degrees. My thought is that robot drivers may underestimate their center of gravity when carrying loads up high and attempting to drive over scoring zones.

Mecanum Wheel

05-01-2015 02:48

Re: 2015: Year of the Mecanum

Quote:

Originally Posted by chrisfl (Post 1419813)

It was the same for us. We used mechanum in 2012 and our only problem was staying in one place on the bridge. We had no problem going up and down it while at an angle.

Quote:

Originally Posted by lark95 (Post 1420235)

My team is also thinking of using mecnum drive. we even have an old robot from logamotion that used mecnum we are able to drive

Quote:

Originally Posted by theCADguy (Post 1420219)

Also, quick question:
Can a mechanum drive be set up where the length of the drive train is greater than the width, or does it require a square wheel configuration?

Quote:

Originally Posted by JosephC (Post 1419860)

If you have not prototyped mechanum or done it before, I would not recommend bringing it out this season. It doesn't seem difficult at first, but you will end up spending far too much time on your drive train instead of allocating proper time to your mechanisms.

*mecanum

sasha831

05-01-2015 05:10

Re: 2015: Year of the Mecanum

Our team used Mecanum last year with rather positive results, though its didn't feel very smooth to drive as the wheels fight each other, even when going forwards. We were not too impressed with the WPI libraries for Mecanum, we couldn't get them to work effectively, so we actually made our own libraries. If anyone wants to use/consult them, they can be found here:

http://ai-robotics.com.au/code-libraries/

For any help with them PM me, or send an email to the specified adress

yara92

05-01-2015 15:36

Re: 2015: Year of the Mecanum

Last Years our team use mecnum.
Can any one tell me why exactly the use of the mecnum this year is comfortable for the game

Herbblood

05-01-2015 16:28

Re: 2015: Year of the Mecanum

Does anyone know what happens with Mecanum on the HDPE? Our team worries about the friction or lack of friction we would have.

zachrobo1

05-01-2015 18:28

Re: 2015: Year of the Mecanum

Quote:

Originally Posted by yara92 (Post 1422129)

Last Years our team use mecnum.
Can any one tell me why exactly the use of the mecnum this year is comfortable for the game

In the past, the reasoning behind not many teams using mecs is that they struggle mightily against defense. On open fields like Aerial Assist, a mecanum bot can be pushed around by a 6/8wd bot with ease. Now, with no contact between opposing alliances, there is virtually no defense that can be played. With mecanums being extremely maneuverable and easy to build and program, many teams feel like this is a favorable drivetrain option.

xhantari

05-01-2015 18:42

Re: 2015: Year of the Mecanum

An issue we found with the use of mecanum wheels on the scoring platform is the fact that when traveling diagonally over the platform, one or two wheels become elevated off the ground. Therefore, these wheels are not able to contribute to the omnidirectional movement of the robot.

oison75

06-01-2015 00:09

Re: 2015: Year of the Mecanum

Also, what gearboxes should you use for mecanum?

mrnoble

06-01-2015 00:18

Re: 2015: Year of the Mecanum

Quote:

Originally Posted by oison75 (Post 1422479)

Also, what gearboxes should you use for mecanum?

We have used AndyMark's NanoTube in the past and it worked great; the gears are internal. I also like the look of Vex Pro's single reduction clamping box.

Whippet

06-01-2015 00:30

Re: 2015: Year of the Mecanum

Quote:

Originally Posted by oison75 (Post 1422479)

Also, what gearboxes should you use for mecanum?

We used a set of AM Toughbox Nanos last year with good success.

Mecanum Wheel

06-01-2015 00:37

Re: 2015: Year of the Mecanum

Quote:

Originally Posted by yara92 (Post 1422129)

Last Years our team use mecnum.
Can any one tell me why exactly the use of the mecnum this year is comfortable for the game

mecanum*

markmcgary

06-01-2015 00:43

Re: 2015: Year of the Mecanum

Quote:

Originally Posted by Mecanum Wheel (Post 1422499)

mecanum*

Dude. Really?

Mecanum Wheel

06-01-2015 01:04

Re: 2015: Year of the Mecanum

Quote:

Originally Posted by markmcgary (Post 1422505)

Dude. Really?

Hello Mark. Mecanum is a commonly misspelled word. There are multiple ways to say it but only one way to spell it. If you have any questions, feel free to ask. Until then, you may refer to this handy chart:

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