28-02-2016 14:59

Chris Endres

Re: pic: FRC 2399 2016 Robot

Looks nice! Any video of it driving/traversing defenses?

28-02-2016 15:35

cbale2000

Re: pic: FRC 2399 2016 Robot

Why the omni wheels? It would seem to be that you would have no control over when the omnis were touching the ground, because any time you cross a defense the configuration will change. Couldn't this lead to inconsistent traction on the drive base?

28-02-2016 17:44

rebelreyek

Re: pic: FRC 2399 2016 Robot

You're right; our wheels flip while going over obstacles and we have don't have a way to control it. However, we prototyped and tested with all three wheels as traction as well as two traction and one omni. We decided on this configuration because it gives us more maneuverability, and after adding (somewhat excessive) weight to our prototype, it became difficult for us to turn.


Here you go!

28-02-2016 17:56

Chris Endres

Re: pic: FRC 2399 2016 Robot

Very nice! One of the best drives with traction wheels I've seen going over defenses. Best of luck.

28-02-2016 20:27

asid61

Re: pic: FRC 2399 2016 Robot

Beautifully simple and it looks extremely effective at traversing. Any chance of a climber going on there?

28-02-2016 20:40

Captain_Kirch

Re: pic: FRC 2399 2016 Robot

I don't quite follow here. Wouldn't the randomness and unpredictability of your traction be a hindrance? Why not keep 3 of the same wheel (plaction or omni) on each pod?

28-02-2016 20:51

ollien

Re: pic: FRC 2399 2016 Robot

I'm quite curious as to how you're driving those without any sort of chain getting tangled. Care to explain?

29-02-2016 09:45

Cam_Team 2619

Re: pic: FRC 2399 2016 Robot

Needs more wheels.

29-02-2016 13:04

taytaythedj

Re: pic: FRC 2399 2016 Robot

I'm intrigued by your design. The wheels make my question though, how does it drive using the 3 wheels? Does each wheel spin by itself or does it have chains going through the 3. SO many questions. I would love to see a video on your robot working and the parts on it. Good Job!

01-03-2016 09:10

Conor Ryan

Re: pic: FRC 2399 2016 Robot

Super innovative design. Much smoother a traversing obstacles than other designs. Did you incorporate it with a lift? This is a great throw back to several great 2004 drive trains.

Look closely in the video, you'll see all the wheels moving.

01-03-2016 09:49

rebelreyek

Re: pic: FRC 2399 2016 Robot

Probably not for our first regional, but there’s some potential there

With one omni per module it’s easier for us to turn. Test driving with them, we didn’t find many issues in terms of traction. On the outerworks, if an omni isn’t providing enough traction to traverse, the entire module will flip anyways. You can see that happen 0:43 seconds into the video; the left front module has an omni in front and rotates to get over the rock wall.

When it comes to driving around and parking on the tower ramp, we’ll always have at least 4 traction wheels in contact with the ground, which we found to be sufficient. The only real issue is when no omnis are touching the ground. It doesn’t disable the drive train, it just makes turning a bit slower.

Let me know if that answers your question; I think I hit on all points of confusion, but I might have generalized or been unclear.

There’s two sets of chain per wheel. On the “top” layer, chain connects the center shaft to one of the traction wheels. The “bottom” layer of the chain runs around the edge of the wheel’s plate and connects all three wheels with one another.

See my description above for details on how the module drives, and let me know if you have any more questions. The modules are free to spin whenever they come to an obstacle they can’t cross normally, as seen in the video!

We haven't included it in the overall design yet, but it's definitely a thought we've had!

01-03-2016 12:42

LiterallyMatty

Re: pic: FRC 2399 2016 Robot

Nice omni's!