Team 67's incredible shooter
 

I've been watching 67's matches lately and haven't been able to keep my jaw off the ground at their shooter. I was able to pause a video frame and get a small glimpse of their shooter on Youtube. It appears they are using the orange 2 7/8" BaneBots wheels (a .8" thick one with a .4" on top). It looks like it's three wheeled.

Has anyone out there played with/against them who can testify to this? (Or maybe someone from the HOT team) I'm looking to find out what motors they are using and what reduction, if any.

We are running a three wheeled shooter with the same BaneBots wheels (expect with the "blue" density). We have three RS 550 motors powering it through Versa-planetary gearboxes. The first wheel that the Frisbee touches is a 5:1 and the second two wheels are running 1:1. Although we are happy with the set-up, we haven't seen anywhere near the same performance that HOT is getting out of theirs. Any information and advice is appreciated.

Thanks :)

Re: Team 67's incredible shooter
 

I suggest simply PMing Adam Freeman about this. He'll answer any questions you could possibly have about it.

Re: Team 67's incredible shooter
 

I'd love to see a response on this forum, if he stumbles upon it; I too am interested its specifics.

- Sunny G.

Re: Team 67's incredible shooter
 

I believe this is what you're looking for:

http://frcteam67.dyndns.org/HOTPhoto...t/IMG_0003.JPG

They have more pictures on their website:

http://frcteam67.dyndns.org/HOTPhotoAlbum/index.html

Re: Team 67's incredible shooter
 

Just PM Adam. He will tell you everything you want to know. :D

Re: Team 67's incredible shooter
 

Thank you for the responses, I've sent him a message. If anyone wants, would be happy to relay information when he responds.

Re: Team 67's incredible shooter
 

Make sure to ask him if 67 would be okay with you relaying information about their shooter. It's one thing to share with one person, it's another to freely distribute information.

Re: Team 67's incredible shooter
 

Sure thing.

Re: Team 67's incredible shooter
 

Thanks for the compliments. Our shooter is pretty good. I wouldn't say it's the best (I personally love 2169's shooter), but it will hold it's own with the best of them.

Shooter Details:
We are using the 3.875" banebot wheels with the orange rubber compound - - http://banebots.com/pc/WHB-HS4-398/T80P-394BO-HS4

It's set up for about a 1/2" of compression on the disk.

For the other side, we have a piece of 2" AL angle. It's got a piece of rubber (not sure what kind) glued to it too provide traction. The only other thing we did was tip about 5 degrees to try and keep the discs from walking out the top. We were trying to eliminate the curve on the shots, but it didn't help much and I think the curve is actually a benefit for us (harder to block).

For speeds we are running a AM-9015 on the first wheel with a pulley setup at 42T:12T ratio (~4500RPM). The next wheel is a Banebot 550, setup on a 30T:12T ratio (~7700RPM). The third wheel is also a 550 with a 22T:12T ratio (~10500RPM).

Each wheel is driven by it's motor, with it own timing belt pulley setup.

MXL Urethane Timing Belts and Pulleys:

http://www.mcmaster.com/#mxl-timing-...ulleys/=m9ecc1
http://www.mcmaster.com/#mxl-series-...-belts/=m9eclj

We used the 1/4" belts.

We run it open loop 100% for the FCS. The driver times the shots to get the correct rythem to try and keep it consistent.

I can't seem to figure out how to post pictures, so let me know if you have questions.

-Adam

Re: Team 67's incredible shooter
 

Thanks for the details. You could post the pictures to a site like imgur, and provide the link.

Re: Team 67's incredible shooter
 

I really appreciate it when the best teams in the world are willing to share info about their designs. I pay close attention.

Re: Team 67's incredible shooter
 

On 67's website at the end of every season, they provide technical notes on the robot. The notes show what they did, how they did it, and why they did it. It's not like they're dumping a full render of every piece of their machine, but I would argue it's one of the most educational and underutilized resources available to teams looking for what makes a multi-Einstein HOF Team "click".

Re: Team 67's incredible shooter
 

Yeah your probably right. The one picture linked above by fr05ty27355 pretty much shows it as well as the picture that I have.

It shows the pulley setup pretty well.

The top and bottom plates on the wheel part of the shooter are 1/8" waterjet AL. We had to find high speed 1/2" diameter bearings for the top, which are pressed into the bearing blocks on the top plate. The lower bearing are 5/16" diameter. I would of prefered larger, but I wanted to try to not add the weight of additional bearing blocks on the bottom too. So 5/16" was the largest we could go and still meet the RPM requirements (+10,000 RPM). So far so good. We lost a couple lower bearings on the practice bot, but I think those were more from being installed incorrectly.

I am planning to create another Tech Notes as soon as things with the robot settled down. Hopefully, I'll get a chance to do that sooner rather than later.

-Adam

Re: Team 67's incredible shooter
 

Nice showing out there today, looked awesome.

Why orange over green or blue for the wheels? Also how often did you change them out?

Re: Team 67's incredible shooter
 

Thanks!

The idea to use banebot wheels came from Allen Gregory and 3847's blog. We were originally trying to use colson wheels, but those transferred too much of the frisbee to the wheel quickly and shot very inaccurately. I emailed Allen and asked about how well their banebot wheels were holding up. He sent back pics of all three different compounds (green, orange, and blue). The green seemed to be worn down really bad, the orange and blue not so much. So we purchased both orange and blue.

The orange had much better grip than the blue. When we tried the blue we needed to squeeze the firsbee much tighter to get an accurate shot, even up close from the pyramid. The orange seemed to offer the best combination of wear and grip.

So far we have only replaced the lower rear wheel, about once per competition. We replaced one before Troy, one before MSC, and one before Eliminations today. All the other wheels are "original".

I think the shooter accuracy is actually falling off from what it was at Troy and early MSC, so we might replace all the wheels when we get to Champs just to be safe.

-Adam