paper: FRC148 - 2011 Robot Assembly - "Raptor"

[MattC9]

Originally Posted by compwiztobe

Has anyone else found the nonagon shaped holes on the "hip joint" linkage? I'm thinking John was having a little fun with this. After all, it is a championship winning shape.

I saw this on there 2010 robot, haven't looked at there '09 robot. But i defiantly think JVN and the wranglers have something with 9-sided figures, we have even seen a drive train from them called Nonagon!!!

[JVN]

I received a question via email...
The model includes (5) CIM motors. The arm motor was actually a Banebot 775 motor run through an AndyMark planetary gearbox.

Brief Aside:
We were lucky that of the (18x) 775s we purchased we had a handful that were good. These motors never gave us any problems. The ones that came with manufacturing defects were NEVER good...

-John

[Siri]

These models are always great, thank you!

Originally Posted by MattC9

I saw this on there 2010 robot, haven't looked at there '09 robot. But i defiantly think JVN and the wranglers have something with 9-sided figures, we have even seen a drive train from them called Nonagon!!!

To be fair, Neun means nine. Who better to invent Nonadrive?

[TEE]

Originally Posted by MattC9

I saw this on there 2010 robot, haven't looked at there '09 robot. But i defiantly think JVN and the wranglers have something with 9-sided figures, we have even seen a drive train from them called Nonagon!!!

I thought the drive train was Nonadrive...

[lemiant]

I don't understand the drivetrain. It looks like it's meant to be nonadrive, but I can't find the horizontal omni.

[lemiant]

Also, what is this for? (the extrusion with a circle and two rectangles cut from it)

[Cyberphil]

Originally Posted by lemiant

Also, what is this for? (the extrusion with a circle and two rectangles cut from it)

That looks to me like a cam chain tensioner. I have seen this a few times before. If your chains become loose, you put a special tool in the two slots, crank it down a little (because it is usually a ratchet) and wala, your chains are tightened.

[Aren Siekmeier]

Originally Posted by lemiant

I don't understand the drivetrain. It looks like it's meant to be nonadrive, but I can't find the horizontal omni.

Their big thing is Nonadrive, and it appears they designed around it this year (you can see some nice empty space in the middle that I can only assume is where the strafe assembly went), however somewhere during the build season they decided to remove it because of how the driver uses the drivetrain (more passive power-slide type moves than actual powered strafing, I'm guessing), so it wouldn't get in the way, and I'm assuming they used the weight to strengthen other areas of their design. At least that's what I've heard, but I'm sure JVN knows all about this...

Really amazing design, you guys, and very well executed. Last year it seemed a little chunky and overcomplicated, if you know what I mean, but you've come a long way to simplify everything. This design and all the interesting decisions that went into it really are great learning material for any FRC team.