Chief Delphi - 4 wheels v. 6 Wheels

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

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

- - 4 wheels v. 6 Wheels (http://www.chiefdelphi.com/forums/showthread.php?t=124382)

bEdhEd

10-01-2014 11:50

Re: 4 wheels v. 6 Wheels

We stick with treaded 6 wheel drive drop center, all year every year unless if the game involves something where a 6 wheel drop center would cause us to be at a disadvantage, which is not often.

We try to go for the same drive system every year so we don't waste any of our build season contemplating other designs, when we know that we have a drive system that is reliable and low maintenance. Saves us time for prototyping if the drive base is built before build season, too. Then we just build another identical one for our final bot. It's just easier that way. Boom done.

During the off season, we do want to try some swerve prototyping.

jijiglobe

10-01-2014 14:36

Re: 4 wheels v. 6 Wheels

6 wheels means a small turning radius if you have a drop center... I think that 6 wheels is the way to go if your doing tank unless you have a very specific reason not to. Last year our team did 6 wheels and was able to turn on a dime. Its also a lot of fun to play with :)

gpetilli

10-01-2014 15:07

Re: 4 wheels v. 6 Wheels

Quote:

Originally Posted by Ether (Post 1324681)

Portabella or Vidalia?

Mushroom OR Onion? I prefer AND.

http://www.tasteofhome.com/recipes/p...oom-onion-soup

not often that I get to poke at Ether.....

Mongai

10-01-2014 15:09

Re: 4 wheels v. 6 Wheels

Quote:

Originally Posted by Joshua Sicz (Post 1324879)

When we had all 6 wheels treaded and we did lower the center an 8th. So make the robot only on 4 wheels at one time.

This is a popular design choice for robots. Last year for the 2013 game, Team 935 had a wheel drop. I want to say the final drop height was less than 1/8" (I'll check when I go over today and subsequently edit this post).

I remember a lot of problems when our robot came to a sudden stop while testing with a 1/8" drop. It would rock to rest on the two front or back wheels, depending on which direction the robot was going when it stopped. This would cause the Frisbee launch angle to lower -- or rise -- causing us to incorporate an angle of launch error to our shooting calculations. Just something you should pay attention to. Not having a drop on a six wheel is counterproductive to its design intent however. Again, I'll update when I run in today.

gpetilli

10-01-2014 15:12

Re: 4 wheels v. 6 Wheels

Quote:

Originally Posted by JesseK (Post 1325007)

My team has had a love affair with 4 wheels since 2012. This year is no different, and this year all 4 are direct-drive. It's so simple: no chain/belts to haggle with, high quantities of hubs to worry about or extra axles to lathe.

The wheel base (width x length) is ~28"x17". The robot would normally be 'tippy', but we have a plan for c.g. and we're going to have ~1/4" ground clearance overall for the frame. This means that the outer edges of the frame will prevent us from going all the way over in the event of a hard stop. Sure, we could put another 2 wheels in to do that for us - but why?

1/4" ground clearance may be too low. There are often cables or other small bumps in the field that are not in the drawings. This year there are not any obvious field parts that would need power, but you never know. What about field debris?

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