Wow, That wheel is like almost exactly the same as our robot's wheels from last year.

http://www2.wildstang.org/ws/inventor/2002/as/as32.jpg

I thought I'd mention this to you. In the picture above, you should be able to see the extra bracing that we put on our spokes. During our practices we had found that without them, 4 of the 5 spokes broke away from the center. These were not made to be dragged sideways across carpet (like what happens when you do a 360 with a 4 wheel drive bot) so keep that in mind.

I have no clue really as to how our wheels where made or exactly what from.

Truthfully, I don't know what the stuff was we used. It wasn't brecoflex, I had the wrong impression of the stuff. Sorry, I was wrong.


I wish I had a link for it, but it worked really well. It's much like the stuff on 535's wheels (link on previous page).

The wheel tread material posted on the previous page and on the Hot Bot wheels I believe is 'Equipment Mounting Pads' from Small Parts Part No. U-PAD-6 3/8" Thick available from 4"x4" to 24" x 24"

Word to the Wise: Order now since Small Parts supply is exhausted for the season in the first few days of the build as many have found out in past years

Last I heard FIRST was supposed to be getting a new supplier so it's probabaly better to wait.

Here's a quick rundown on how we built our wheels.

1. Draw cool flame pattern in AutoCAD
2. CNC machine (or water jet) spoke plate from 1/4" Al.
3. Machine a 1/4" wide spoke slot in 2" X 12"*pi Al. plate
3. Anneal 2" Al plate (heat it up with a torch to make it softer)
4. Roll 2" plate into 12" diameter
5. Weld the palte to the spoke (the spoke plate is constrained in the machined slot)
6. Weld 1" Diameter X 2" Al round stock to center of wheel
7. Chuck wheel into lathe and bore axle hole
8. Broach keyway in the axle hole
9. Mount whell on an axle and turn outer surface
10. Glue tractioin material to wheel.

Presto.... "Pimpin Wheels"

Oh yah and don't forget to polish them before welding.

We pulled 220 lb. on SPAM's (I think) pull station at nationals.

I have pratically almost all of the manual memorized from the 2000, 2001, and 2002 game. Let me know if I am wrong, but isn't it illegal to have a fastner (screw) type device on the wheels? Or do they pass until they tear up the carpet?

yep, those are our wheels. made them by using a jig we created to cut out the sides, very hard work. and the metal wasn't heated, just rolled on a machine we have our at the other high school. sides were welded to the rolled aluminum and then we cut out the middle of a 60t sprocket, tapped it, and screwed it to the wheels. then we rivited neopreme around them, later we added neopreme pegs at our regional, and then spikes at nationals which we were forced to take off, so instead we added neopreme between the spikes and clamped them together making a vacume effect. if you talked to me at bash i probably mentioned something about the wheels. and they have a 12 inch diameter, 4 inches accross.

yup....they pass untill we destroy the carpet, (which we did at nationals) i have a picture of the new spiked wheel covers with neopreme somewhere around here, no pictures of the ones with just spikes. they took about 20 minutes of convincing the judges just to let us try them, and they resulted in a 20 second practice round for us (probably the shortest one anyone got)

well.. you got the 20 seconds to at least know if you move or not. myself and the rest of the floor team on 84 showed up to our first match at both MidAtlantics and Nats last year with never running the robot before. :rolleyes:

they are really nice wheels, to bad they didn't attack the carpet though. how long did it take to make something like that, and you probably didn't do it with a band saw and a scroll saw I'm guessing! ;)

DQ4: Deliberately damaging the playing field, controls or balls is strictly illegal and will result in disqualification of your alliance. Robot wheels must not, for example, damage the field
carpet. This will be checked during robot inspection at registration on the first event day and throughout the competition. Bunching up or puckering the carpet is considered damage to the field.

nope....everything on there was made by hand by myself, frank, dan and eric. they took about 4 hours each to make the complete wheel. cut out with a hand jigsaw....fun stuff

hey John,
um...er...no, we never made any cooefecient calcualtions, well at least that i know of. after the season was over, we fooled around with team 60 style tread, and they worked alot better, although u gotta admit that those were some pretty nice wheels. i would make a new set of those wheels, but we decided not too, we are going cheap this year.
hope u liked them
:)


bad

http://www.chiefdelphi.com/forums/pi...&quiet=verbose

http://www.chiefdelphi.com/forums/pi...&quiet=verbose

Pulleys work very well. You can get them any size you want.

This is the first year we had too much power. We ripped 4 tracks right in half. we found out it only takes 750 lbs of torque to rip a Breco Flex timing belt.

We connect all are sprockets by a square shaft. this way we do not need any type of set screw, they will self alien

in-lbs or ft-lbs?