Chief Delphi - Too much traction

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

- Technical Discussion (http://www.chiefdelphi.com/forums/forumdisplay.php?f=22)

- - Too much traction (http://www.chiefdelphi.com/forums/showthread.php?t=64933)

Re: Too much traction

You should try the omni wheels. they work really well for us. In the past we had the same problem. This year we bought the Andy mark aluminum omni's. Our set up is omnis in front and 2 inch wide wheels in back. Front and back are powered. It has worked really well. At the Suffield scrimmage we were really fast going around the track, at the same time we could push fairly well. If you cant get the omnis try the KOP wheels. they might work well also.

Re: Too much traction

go omni or i don't no if this is a good idea but take the robot and jack it off the ground and sand down those wheels i never used those wheels so i don't no if that is possible... and be careful if you do this.

Re: Too much traction

Thank you everyone, with all of these we will find a solution to your prob.

Re: Too much traction

Heres a simple solution. Order some AM Plastic Omniwheels. Bring them to the competition. They work with the same bearings as the traction wheels I believe and have the same sprocket mounting pattern. Put omni's on two of the corners (front left and back right or FR+BL) and it should help turning without being really wild. If you still don't have the turning you like, then put the omni's on the front. You shouldn't break chain unless you didn't align them correctly.

I would advise finding the drawings for the plastic omniwheels on Andymark's site and comparing dimensions with the IFI Traction wheels you are using so you can make new spacers before the competition.

Re: Too much traction

we had exactly the same problem last year. if you can't replace the wheels once you get to regionals, would either flip over the tread on the front or back wheels. wrapping them in duct tape, and putting lots of zipties around them might work even better. hope you can fix it once you get there, ours were simply a disaster last year.

Re: Too much traction

Quote:

Originally Posted by DarkFlame145 (Post 705490)

Thank you very much everyone, I was just talkign to a mentor and we now have a few things we will try:

1) Move the center wheels to change the wheelbase

2) Use a 1” wide wheel for 2 of the wheels which will reduce the friction (less wheel tread on the carpet)

3) Raise or lower the casters.

4) Install larger casters

5) Replace a wheel set for a pair of omni wheels

6) Change the wheel tread to lower friction type

7) Change the gear ratio of the drive

8) Install larger wheels on the left side of the robot (old dirt track stock car trick)

Number 8 is my personal fav cause it keeps in the spirit of the bases of this years game

1> Will work as long as the movement is to shorten the wheelbase
2> Reducing the wheel width will not gain much as Coefficient of friction has not changed
3> Will work, but be careful of reducing the contact of your wheels or you may go too far and end up with no traction on your center wheels (and end up hitting the walls).
4> Same as 3 with no adjustability
5> This wil work for turning ... but be careful if you do this with your wheels in the center of your bot as you may end up just swinging the rear out when you turn with little control at higher speeds
6> Will work, but will need some experimentation to find a good CoF wheelset
7> Will work as long as it's a slower gear ratio
8> :D Will make the bot difficult to drive straight.

Good luck, I'd suggest changing the center tires to ones with a lower CoF

Re: Too much traction

Quote:

Originally Posted by Daniel_LaFleur (Post 706383)

8> :D Will make the bot difficult to drive straight.

Good luck, I'd suggest changing the center tires to ones with a lower CoF

We could set the joysticks to counter react the pull of the wheels. So when we push the joysticks forward it should go strait.