Chief Delphi - Mecanum Rolling Chassis

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

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

- - Mecanum Rolling Chassis (http://www.chiefdelphi.com/forums/showthread.php?t=111561)

lcoreyl

19-01-2013 15:23

Re: Mecanum Rolling Chassis

Quote:

Originally Posted by Billfred (Post 1218436)

the relative inefficiency inherent to mecanums is what ruled it out for me this year

inefficient at what?

Billfred

19-01-2013 16:12

Re: Mecanum Rolling Chassis

Quote:

Originally Posted by lcoreyl (Post 1218637)

inefficient at what?

Reread Wing's post:

Quote:

Originally Posted by Wing (Post 1218305)

A lot of teams are allured by the whole "manoeuvrability" aspect of mecanum, but in reality it isn't that cut and dry. What you gain with a third axis you lose in traction and power. Since the omnidirectional motion of meccanums is produced by vector summation, you'll always have some sort of power loss in whatever direction you go in. Combine that with the low coefficient of friction, your robot may be able to go sideways, but you won't be going fast...

lcoreyl

19-01-2013 16:57

Re: Mecanum Rolling Chassis

I couldn't tell if you were re-iterating what Wing said.

I disagree that power is "wasted", or speed is sacrificed for mecanum.

We have just posted a whitepaper addressing this (see my signature).

Sorry to the OP for contributing to hi-jacking this thread!! I really like the look of your bot and will be interested to see the rest, and hear how the modulox goes!!

If anyone disagrees with our paper, let's discuss it here

math311

20-01-2013 01:01

Re: Mecanum Rolling Chassis

What a beautiful drive! That is a wonderful paint job.

As for hating on mecanums, the mudslinging will probably never end. I will not hate on any drive. I will say that my team has done mecanums for the past 3 years, with an award winning omni drive my first year. In 2012, we could drive up the bridge sideways and forwards. We pushed other robots up those bridges, multiple times. And yes, the 2 times when we were engaged in a direct pushing match, we weren’t quite as strong as the six wheel robot. But instead of engaging, we used maneuverability to go around them.

There are different strengths and weakness's to every drive. Success is found by playing in a way which uses the strengths of the drive, and minimizes the weakness's, so that you are playing to your greatest ability.

mikegrundvig

21-01-2013 15:04

Re: Mecanum Rolling Chassis

Really attractive chassis all around! I wish ours was as pretty :)

As for the whole Mecanum pushing thing, I think that's highly overstated. This isn't a game of tug-of-war. Good programming of the controls makes a tremendous difference in the drive-ability of the robot. We are using a single joystick to drive the robot like a car and a second joystick to provide "strafing" controls. With good acceleration/deceleration curves added to avoid "jerky" movement of the robot along with dead zones in a few places to avoid twitchy and finicky driving, it's working out great. As our robot will be reasonably light for FRC (under 100 lbs at the worst with bumpers/battery, etc.) we plan on playing up speed and maneuverability a great deal. Mecanum facilitates that when done properly.

-Mike

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