Chief Delphi - How good are your tires??

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

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

- - How good are your tires?? (http://www.chiefdelphi.com/forums/showthread.php?t=16823)

Fiziks

27-01-2003 01:12

are we allowed to put traction material on the wheels as long as it's not metal filecards or sandpaper?

Matthew936

27-01-2003 11:15

Can't give away exact details, but with our tires our only concern even on the top is will we have to much traction :) oh and i dare any of you to try and push us off the top, even if we don't build anything else to keep us up there

Adam Y.

27-01-2003 11:23

Quote:

Its not always a trade off for Maneuverability or traction. Often teams solve this with plastic front wheels that will slide sideways. This works but the plastic wheels don't give the best traction.

Actually as long as the front wheels aren't powered you shouldn't have a problem with what you choose for them. The only wheels that really need to have good traction are powered ones.

Quote:

Can't give away exact details, but with our tires our only concern even on the top is will we have to much traction oh and i dare any of you to try and push us off the top, even if we don't build anything else to keep us up there

I'd like to see that conserding how a 190pound person with rubber sneakers on still manages to slide around on that plastic stuff.:D

Quote:

Herrmmm.... well.. there is no arguing that the Tread system is the BEST traction out there,

Actually there are other ways to increase traction but none that would really be usefull in this competition due to the rules constraints. I've read about using vaccuum pumps and making your own wheels to increase traction.

GregT

27-01-2003 13:12

Tracks will not help on the platform.

For all of our purposes, F = (constant) (force normal)
Tracks do help on the carpet and will probably help on the ramp, but the top is no-mans-land. My prediction is momentum will be important, which involves speed up the ramp and not torque/pushing power.

I can hardly wait!

Adam Y.

27-01-2003 13:19

Quote:

For all of our purposes, F = (constant) (force normal)

It's a whee bit more complicated than that. You could in theory get a coefficent of friction higher than one even though in physics they don't teach you that. Of course your right in saying that momentum is more important because forces involve acceleration and I don't think many bots will be accelerating all the time.

Cory	27-01-2003 13:22

Quote:

Originally posted by dez250
oh guys since our team has a real field ramp, full size made, well its almost complete but what i wanted to say is your bot wont work with tracks at the top of it, it will be to rigid and will slam down at the top also if your bot only weighs 55 pounds, i hope you dont plan on staying on top of the HDPE platform, cause 55 lbs will slide right off, that stuff is slicker then ice and your bot will be pushed right off. Well also there is one more thing i would say about goling up the ramp with your bot but since i want to get you guys thinking about it, whats goign to happen when you put anything weighing over 20lbs going faster then 2ft/sec at a 14degree incline, it wont climb! the bot will slide down the ramp if its going at all relitivly fast, or you prob are braking a rule if it doesnt slide right down or has traction on the grate (hint: you cant have anything go through the open 1"x1"grate squares...)
~Dez
www.team250.org

Hateto break it to you, but we move t 3-4 fps in low last yr, and we can move up the ramp easily with last yrs robot. It bottoms out, but lwoering the axles takes care of that

Cory

GregT

27-01-2003 14:01

Quote:

Originally posted by wysiswyg
It's a whee bit more complicated than that.

Hence the "For all of our purposes" ;)

Sachiel7

27-01-2003 17:07

Hate to brake it to you Matthew936, but with one of our little toys, nobody will be able to push us off the ramp...
Hey, if you're going to VCU, mabie we'll be alliance partners :D
We'll be unstoppable, FWAHAHAHAHAAAAAAAAAA!

Matthew936

27-01-2003 17:12

Quote:

Originally posted by Sachiel7
Hate to brake it to you Matthew936, but with one of our little toys, nobody will be able to push us off the ramp...
Hey, if you're going to VCU, mabie we'll be alliance partners :D
We'll be unstoppable, FWAHAHAHAHAAAAAAAAAA!

We are going to Washington, and i have a feeling that we would have no problem pushing you, atleast pushing part of you off
FWAHAHAHAHAHAAAAAAAAAAAA!

;)

Sachiel7

27-01-2003 19:25

Actually, we are really robust.. It'll be hard to bust us up
We're going to the washington (DC) practice, is this what you mean?

Matthew936

28-01-2003 09:59

nope, Seatle

Sorry we are going to Seatle, Washington.

Fiziks

28-01-2003 23:10

us toooo!

Hey, we're going to seattle too, c u there.

Edward Debler

28-01-2003 23:29

Quote:

Originally posted by wysiswyg
..... You could in theory get a coefficent of friction higher than one even though in physics they don't teach you that. ....

Last year Team 217 ThunderChickens used the Neoprene pad material (from Small Parts catalog) on the wheels of our robot.

We determined that the coefficient of friction with the carpet was >1.6. As proof, our robot pulled 220 lbs (horizontal force) at a demonstration conducted during the National competition at Orlando.

Matthew936

29-01-2003 11:27

Quote:

I'd like to see that conserding how a 190pound person with rubber sneakers on still manages to slide around on that plastic stuff.:D

Who ever said anything about rubber? god i love technology

johnscans

29-01-2003 15:38

our robot can move around at a farely good speed with our mentor standing on it with only 1 of our 2 drivetrain motors attached. the wheels are performing above and beyond expectations.

john scans

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