How do you drive the KOP 6" wheels?

[Alex Cormier]

I'm trying to design a 6 wheel drive system and i can't figure out how to drive them. it goes with this thread. i cant seem to figure out how to get it there and capable to drive other then take out the bearing and find a smaller one that fits inside it and has a key way, i look forward once again to your posts!

thanks,

pb

[rees2001]

In the past we have used a hub (found on www.firstcadlibrary.com under mechanical) with a sprocket attached to it. You will probably need wheel wedges also (found on www.firstcadlibrary.com under manufactured). Last year we attached a gear to an aluminum adaptor to the hub to drive our tri-wheels. You may want to machine the hub's yourself out of Delron because we found the "MMH" version to be too weak. They broke apart quite eaily because they are molded.
If you need some more 6" wheels for your idea let me know. We have a bunch here. Good luck with your 6 wheel drive, I can't wait to see it run. If you need any help let me know.

[SpaceOsc]

Originally Posted by rees2001

In the past we have used a hub (found on www.firstcadlibrary.com under mechanical) with a sprocket attached to it. You will probably need wheel wedges also (found on www.firstcadlibrary.com under manufactured). Last year we attached a gear to an aluminum adaptor to the hub to drive our tri-wheels. You may want to machine the hub's yourself out of Delron because we found the "MMH" version to be too weak. They broke apart quite eaily because they are molded.
If you need some more 6" wheels for your idea let me know. We have a bunch here. Good luck with your 6 wheel drive, I can't wait to see it run. If you need any help let me know.

delron?


did you mean delrin?

if not id like to know what delron is

and what do the wheel wedges do??

[Elgin Clock]

It seems to me that the wheel wedges do the same thing as the wheel hub on firstcadlibrary.com but the hub includes an extra 1/4" - 1/2" plate to mount things to.

The wedges (and the cutouts on the hub) fit in the spaces between the "spokes" on the wheel. All it does is make a flat surface to mount the wheel to a base or, a sprocket.

See picture here. This one uses the wheel hub (with the sprocket on the opposite side mounted on the open part of the hub). Open part of the hub meaning the side without the flat surface. In this case, the flat surface sits flush to the spoke and the sprocket is mounted on the opposite side.

http://www.team237.com/gallery/6-Wee...-Time/MVC_048F

[Alex Cormier]

Originally Posted by Elgin Clock

It seems to me that the wheel wedges do the same thing as the wheel hub on firstcadlibrary.com but the hub includes an extra 1/4" - 1/2" plate to mount things to.

The wedges (and the cutouts on the hub) fit in the spaces between the "spokes" on the wheel. All it does is make a flat surface to mount the wheel to a base or, a sprocket.

See picture here. This one uses the wheel hub (with the sprocket on the opposite side mounted on the open part of the hub). Open part of the hub meaning the side without the flat surface. In this case, the flat surface sits flush to the spoke and the sprocket is mounted on the opposite side.

http://www.team237.com/gallery/6-Wee...-Time/MVC_048F

ok, so basically the wheel is driven by the spokes since it is pushed byt the hub that goes inside the wheel? do i get it right?
and heres the sprocket = http://www.team237.com/gallery/6-Wee...-Time/MVC_056F, http://www.team237.com/gallery/6-Wee...-Time/MVC_024F

[Tytus Gerrish]

On SwampThing we used .5" shaft with the 6" wheels we turned delrin adapters for them and used spring pins. However in finals at UCF a pin sheared and Pretty much crippled it for a match. had it not failed we would have won that match and possibly the regional. The problem was fixed on the fly By James Jones of 180 by drilling a hole through it all and then using the drill bit he drilled it with it to hammer into the hole he made as a codder pin. As for the 6" wheels they are excellent wheels especially after they have been used for a while then they have a flat tread and are in their prime. they aren't very great for traction but that is perfect for 4 wheel drive. we were second seed at UCF and undefeated Winners of the Robot rodeo.

[rees2001]

Originally Posted by SpaceOsc

delron?

did you mean delrin?
if not id like to know what delron is
and what do the wheel wedges do??

Yes, sorry for the confusion. I did mean Delrin. Elgin is also right on with the wedges. I was looking at some pictures of our robot from last year and we made our wedges out of aluminum. http://www.team340.com/gallery/robot/113_1374?full=1
We also added a little something to the tread of the wheels to help them stick. We turned the rubber down to a flat surface and put on a little traction. Something we had left over from our 2003 wheels. It worked great. We didn't spend much time on the carpet so turning wasn't an issue. When we did test the traction on the carpet she didn't turn as easy as our past 4 wheel robots.

And PB any time you want to stop by & check out our robot or "supplies" you are more than welcome. You must know how the Rochester teams are always willing to share with each other.

[Elgin Clock]

Originally Posted by Pit Bull 1126

ok, so basically the wheel is driven by the spokes since it is pushed by the hub that goes inside the wheel? do i get it right?
and heres the sprocket = http://www.team237.com/gallery/6-Wee...-Time/MVC_056F, http://www.team237.com/gallery/6-Wee...-Time/MVC_024F

Yup.