pic: Did Somebody Say Defense Game?
 

Here's a few specs...

The drive consists of:
12x - 4" VEXPro Traction Wheels in 1.5" wide configuration
2x - VEXPro 3-CIM Ball Shifters with 9.07:1 High Gear and 24:1 Low Gear
22x - 50-tooth VEXPro gears for the wheels and idlers
4x - CIM motors (2 on each gearbox)
2x - MiniCIM motors (1 on each gearbox)

• Each wheel is combined with a 50-tooth gear via a VEXPro Versa Hub.
• Two wheels are directly driven via Hex output from the gearboxes.
• All 6 wheels on each side are driven via connecting 50-tooth idler gears (not shown in this picture) in a 1:1 ratio.
• The wheels are aligned on a 32' arc, allowing for easy turning with minimal scrub.

Re: pic: Did Somebody Say Defense Game?
 

Cross your fingers that it will turn without popping the breakers.

Re: pic: Did Somebody Say Defense Game?
 

Actually, they're missing a couple of wheels. (2007 joke)

If it's anything like what they've done before, the wheels are in a bit of an arc, so it acts more like a 6WD drop than a 4WD "bounce turn".

Re: pic: Did Somebody Say Defense Game?
 

Looks like it'd be more of an 8WD, but I could be wrong.

Re: pic: Did Somebody Say Defense Game?
 

I don't see this as having much higher turning scrub than a six wheel drive. In theory, this system would behave like a tread drive and this would turn even without drop. I guess we shall see!

Re: pic: Did Somebody Say Defense Game?
 

I agree, looks like they are set in pairs.

If I were holding the joysticks in this case :D :

Re: pic: Did Somebody Say Defense Game?
 

Is this a similar design to what your team ran in 2008? If so, what reliability changes were made?


2008 robot
Context (Still one of the classiest decisions in FIRST history)

Re: pic: Did Somebody Say Defense Game?
 

Yes. Can you sent a video with it running

Re: pic: Did Somebody Say Defense Game?
 

Oh god. it's back.

Re: pic: Did Somebody Say Defense Game?
 

Hey! That's almost as many wheels as ours.

Re: pic: Did Somebody Say Defense Game?
 

Adding wheels doesn't really increase your traction/pushing power, does it? I'm sure that the extra width helps, but not the number.

Re: pic: Did Somebody Say Defense Game?
 

Adding surface area in contact with the ground (up to a point) increases traction. It doesn't matter if it's through wider wheels, or more wheels. If friction worked just the way the coefficient of friction says it will, then neither width nor number of wheels will affect traction at all. You could have three 0.1" thick wheels, and have the same amount traction, but friction doesn't follow the super simple columbic prediction, especially on carpet.

Re: pic: Did Somebody Say Defense Game?
 

Yeah, I doubt that all of those wheels are on the ground at the same time though, unless they don't want to turn.

Re: pic: Did Somebody Say Defense Game?
 

How long are you going to have in a pushing match with a 6 cim drive before you start popping breakers?

Re: pic: Did Somebody Say Defense Game?
 

Love it!