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-   -   pic: 148 Follower Wheel Assembly (http://www.chiefdelphi.com/forums/showthread.php?t=72609)

Brandon Martus 21-01-2009 19:23

pic: 148 Follower Wheel Assembly
 

Jonathan Norris 21-01-2009 19:24

Re: pic: 148 Follower Wheel Assembly
 
Totally unnecessarily awesome... :cool:

Ice Berg 21-01-2009 19:30

Re: pic: 148 Follower Wheel Assembly
 
How is this going to measure ground speed if it can't touch the ground?

Joe G. 21-01-2009 19:32

Re: pic: 148 Follower Wheel Assembly
 
It can.

The GDC has ruled that similar devices do not count as "traction devices" in the Q and A.

NoahTheBoa 21-01-2009 19:33

Re: pic: 148 Follower Wheel Assembly
 
It was asked in the Q&A and they said that if it does not provide traction than it can touch the ground. The actual rule says that the rover wheels are the only thing that can provide traction, not the only thing that can touch the ground.

synth3tk 21-01-2009 19:34

Re: pic: 148 Follower Wheel Assembly
 
Quote:

Originally Posted by Ice Berg (Post 805477)
How is this going to measure ground speed if it can't touch the ground?

I'm no mechanical engineer (no, really, I'm not) but I'm assuming this will either touch the KOP wheels or somehow be attached along the route of the chains, without touching the ground.

NoahTheBoa 21-01-2009 19:43

Re: pic: 148 Follower Wheel Assembly
 
Here is a relevant Q&A on the subject
Quote:

Question:
Can any part of your robot...other than the FRC supplied wheels...make contact with the playing surface if their intention is not to provide traction to propel or stop the robot?

GDC:
Yes.
http://forums.usfirst.org/showthread.php?t=10919

Joe Ross 21-01-2009 19:45

Re: pic: 148 Follower Wheel Assembly
 
We were planning to do the same thing, but with all vex components, including the new encoders. Hadn't gotten to it yet.

Karthik 21-01-2009 19:55

Re: pic: 148 Follower Wheel Assembly
 
Fabulous use of VEX parts in a very elegant package. I think we'll be seeing a lot of similar assemblies this year.

Raul 21-01-2009 19:56

Re: pic: 148 Follower Wheel Assembly
 
Humm - how much bigger than the green gear is that omni wheel? The reason I ask is because on the carpet, the wheel may sink in enough to allow the gear to grab some carpet fibers.

Also, is it just pivoting off the robot frame from that empty set of holes, and thus using gravity to keep it in contact with the floor?

NoahTheBoa 21-01-2009 19:59

Re: pic: 148 Follower Wheel Assembly
 
If you are just using gravity to maintain contact with the ground have you tested to see if it slips at all when driving on the regolith?

danshaffer 21-01-2009 20:03

Re: pic: 148 Follower Wheel Assembly
 
Beautiful assembly!
Have you tested whether it will stay on the ground under its own weight? If not, may I suggest gas springs!

Akash Rastogi 21-01-2009 20:24

Re: pic: 148 Follower Wheel Assembly
 
Correct me if I'm wrong, but are those delrin sideplates? They look very nice. Good luck with this. =)

Greg Needel 21-01-2009 20:26

Re: pic: 148 Follower Wheel Assembly
 
I like the fact that black gear is an ABS rapid prototype. Want to clue the world into the right pitch for interfacing with a vex gear?

AdamHeard 21-01-2009 20:35

Re: pic: 148 Follower Wheel Assembly
 
Soo.... will Vexlabs be selling these?

Quote:

Originally Posted by Raul (Post 805507)
Humm - how much bigger than the green gear is that omni wheel? The reason I ask is because on the carpet, the wheel may sink in enough to allow the gear to grab some carpet fibers.

Also, is it just pivoting off the robot frame from that empty set of holes, and thus using gravity to keep it in contact with the floor?

We had a similar plan, and were thinking if gravity wasn't sufficient, a rubber band to add a slight amount of tension would be easy enough.


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