05-11-2011 03:22 PM

Brandon Holley

Re: paper: FRC148 - 2011 Robot Assembly - "Raptor"

Thanks JVN! Always fun to take the robot tour on your own from the comfort of your own computer.

-Brando

05-11-2011 03:30 PM

Nemo

Re: paper: FRC148 - 2011 Robot Assembly - "Raptor"

This one gets my vote for most impressive robot of the year. Thanks for posting this along with your blog entries. It's really cool stuff to take in.

05-11-2011 04:02 PM

Akash Rastogi

Re: paper: FRC148 - 2011 Robot Assembly - "Raptor"

Thank you JVN and the entire Robowrangler team.

05-11-2011 04:28 PM

sgreco

Re: paper: FRC148 - 2011 Robot Assembly - "Raptor"

Thanks for posting.

Downloading 148's robot is one of my favorite things to do every year.

I looked at the model, and I can't figure out what propels the minibot forward? Is it some sort of spring? It looks like there is a release cylinder, but I can't figure out what it does.

05-11-2011 05:28 PM

Jamie Kalb

Re: paper: FRC148 - 2011 Robot Assembly - "Raptor"

Seconded. Thanks JVN and the whole 148 crew!

05-11-2011 05:40 PM

JVN

Re: paper: FRC148 - 2011 Robot Assembly - "Raptor"

Lots of surgical tubing.
We connect the surgical tubing from the cradle that the minibot sits on to the tip of the "Y" which aligns to the pole.

Since the surgical tubing is held on with zip-ties... we don't model it.

-John

05-11-2011 06:24 PM

avanboekel

Re: paper: FRC148 - 2011 Robot Assembly - "Raptor"

Can you post a picture of this then please?

05-11-2011 08:54 PM

MattC9

Re: paper: FRC148 - 2011 Robot Assembly - "Raptor"

Another great robot comes out from 148!! hey is there anyway i could import the mates for the assm.?
But seriously, i love this thing.

05-11-2011 10:18 PM

Aren Siekmeier

Re: paper: FRC148 - 2011 Robot Assembly - "Raptor"

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.

Also, those 11 tooth CIM pinions have got to be really nice, expanding your range of possible reductions by nearly 10% !!! over the commonly available 12 tooth pinions. Since most teams have access to an arbor press or something functionally equivalent (they're not too terribly expensive anyway), I've been thinking this would be really nice to have commercially available. Maybe something for AndyMark to jump on? They are particularly useful in drivetrains with CIM motors, because they allow you to get a reasonable reduction with just a single stage.

05-11-2011 10:31 PM

MattC9

Re: paper: FRC148 - 2011 Robot Assembly - "Raptor"

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!!!

05-11-2011 11:00 PM

JVN

Re: paper: FRC148 - 2011 Robot Assembly - "Raptor"

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

05-11-2011 11:01 PM

Siri

Re: paper: FRC148 - 2011 Robot Assembly - "Raptor"

These models are always great, thank you!

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

05-12-2011 09:50 AM

TEE

Re: paper: FRC148 - 2011 Robot Assembly - "Raptor"

It gets my vote as well

05-12-2011 09:51 AM

TEE

Re: paper: FRC148 - 2011 Robot Assembly - "Raptor"

I thought the drive train was Nonadrive...

05-19-2011 06:55 PM

lemiant

Re: paper: FRC148 - 2011 Robot Assembly - "Raptor"

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

05-19-2011 07:04 PM

lemiant

Re: paper: FRC148 - 2011 Robot Assembly - "Raptor"

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

05-19-2011 07:10 PM

Cyberphil

Re: paper: FRC148 - 2011 Robot Assembly - "Raptor"

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.

05-19-2011 08:55 PM

Aren Siekmeier

Re: paper: FRC148 - 2011 Robot Assembly - "Raptor"

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.