Chief Delphi - 2015: Mecanum or Slide?

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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: Mecanum or Slide? (http://www.chiefdelphi.com/forums/showthread.php?t=131964)

wilderbuchanan

04-01-2015 16:19

Re: 2015: Mecanum or Slide?

Quote:

Originally Posted by who716 (Post 1420347)

drop center allows for turning on the center of the robot for quick maneuverability i like that option

but with tall robots and heavy loads they will be very tippy

Peyton Yeung

04-01-2015 16:21

Re: 2015: Mecanum or Slide?

Quote:

Originally Posted by KineticCougar (Post 1421167)

What are the size restrictions for the wheels? Can I put 4" wheels on my robot?

Yes you can put 4" mecanum wheels on your robot seeing how both vendors offer them.

asid61

04-01-2015 16:50

Re: 2015: Mecanum or Slide?

Quote:

Originally Posted by Peyton Yeung (Post 1421175)

Yes you can put 4" mecanum wheels on your robot seeing how both vendors offer them.

Consider though that it might not let you go over the ramps.

pimathbrainiac

04-01-2015 16:50

Re: 2015: Mecanum or Slide?

I like WCD for this one, it's a lot faster than mecanum (the other option my team has the resources to use) and is maneuverable enough to do what it needs to do. Our team did really well in Stack Attack with tank drive. I don't think WCD or tank are out of the option.

Gregor

04-01-2015 17:04

Re: 2015: Mecanum or Slide?

Quote:

Originally Posted by pimathbrainiac (Post 1421204)

I like WCD for this one, it's a lot faster than mecanum

Why do you say that?

pimathbrainiac

04-01-2015 17:10

Re: 2015: Mecanum or Slide?

because it is true. If you have the same gearboxes with the same motors, the wheels rotate at the same speed, but mecanum looses some of that due to the way the wheels are angled.

BrendanB

04-01-2015 17:14

Re: 2015: Mecanum or Slide?

Quote:

Originally Posted by pimathbrainiac (Post 1421223)

because it is true. If you have the same gearboxes with the same motors, the wheels rotate at the same speed, but mecanum looses some of that due to the way the wheels are angled.

Why do you need to be fast in this game?

A better way to look at this game is analyze where your robot needs to go and what is between you and that point. How do you get from these points the fastest? Will that route change during the match? If so how do you overcome that?

Whippet

04-01-2015 17:26

Re: 2015: Mecanum or Slide?

Quote:

Originally Posted by pimathbrainiac (Post 1421223)

because it is true.

No, it's really not.

cgmv123

04-01-2015 18:44

Re: 2015: Mecanum or Slide?

Quote:

Originally Posted by KineticCougar (Post 1421167)

Can I put 4" wheels on my robot?

Is there a rule prohibiting you from putting 4" wheels on your robot?

If you want to use 4" mecanum wheels from AndyMark, make sure to order this set of wheels and not this set, which is designed for FTC robots and is not rated for the weight of an FRC robot.

(VexPro only sells one type of 4" mecanum wheel, and it's rated for FRC robot weights.)

KamalRC

04-01-2015 19:21

Re: 2015: Mecanum or Slide?

Just be careful on using slide if you are using 2"x1" frame because that middle wheel is likely to be damage by going over the platform

Gregor

04-01-2015 19:26

Re: 2015: Mecanum or Slide?

Quote:

Originally Posted by pimathbrainiac (Post 1421223)

because it is true. If you have the same gearboxes with the same motors, the wheels rotate at the same speed, but mecanum looses some of that due to the way the wheels are angled.

Why would you gear two different drive systems the same?

Monochron

04-01-2015 20:46

Re: 2015: Mecanum or Slide?

Quote:

Originally Posted by Whippet (Post 1421246)

No, it's really not.

I wish that paper addressed the "top speed, and thus the 'feel' of accelerating, in the sideways direction is less than the forward and reverse direction." I still don't know if that one is true.

RachetIsLife

10-01-2015 13:38

Re: 2015: Mecanum or Slide?

Quote:

Originally Posted by Mineboy2300 (Post 1420255)

I would go with slide because it provides maneuverability and speed but doesn't have the problems with balance that mecanum does. it would take a lot of engineering to make sure that the entire robot is balanced both with and without the totes on it.

However if you used slide you would have to build a kind of suspension system to prevent the center wheel from being snapped off when going over the bumpity bump

IronicDeadBird

10-01-2015 13:47

Re: 2015: Mecanum or Slide?

Quote:

Originally Posted by sanelss (Post 1419998)

swerve. agility is ever more important the more confined you are and you have that bump to deal with

Going to ahead and say without proper motor management swerve might not be optimal. The standard swerve I see takes 2 cim's per module with 3 modules. That is using 6 cims.
Now if you don't use all 6 cims you would have in theory 3 spare cims. Thats a lot of motors for super structure.

MStump

10-01-2015 14:58

Re: 2015: Mecanum or Slide?

Most swerve drives I've seen have four modules with 1 CIM each, although I have seen one offseason swerve drivetrain that used 3 modules.

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