Team 1339 Reveal

[mrnoble]

http://www.youtube.com/watch?v=BG3zcrWX0qA

The USS Defiant. Something a little different for your perusal.

[Trey178]

Finally, another team with a pneumatic puncher! Defiant looks very well contained. My props to the students who helped build such a well performing machine :cool:

[DanielPlotas]

do the pick-up wheels spin when it is shot?

[IronBenderII]

Cool robot but even cooler introduction to the video... Nice work team.

[D_Price]

Very nice shooting mechanism. And glad to see another robot with a pneumatic punch.

[IronicDeadBird]

It is not a pneumatic punch.
The wheels used for pickup are thrown into reverse and the piston just moves the ball into contact with the wheels.

[bEdhEd]

Are the secondary banebot wheels behind the shooter wheels passive? It seems like they're there to keep the ball in.

Plus, that intro made me smile.

[IronicDeadBird]

Are the secondary banebot wheels behind the shooter wheels passive? It seems like they're there to keep the ball in.

That is partially correct while it does help keep the ball in it also makes sure the ball is centered when picked up.

[mrnoble]

Ironic Dead Bird is correct. It is essentially a wheeled shooter, ala a pitching machine. The front wheels are both the intake and the shooter. The wheels behind them are unpowered dead axle, and are simply the holding mechanism (they hold very firmly; we tried to punch and kick the ball out and couldn't move it out). The pneumatics are for pushing the ball into the wheels.

Other notable features:
-3Cim Ball Shifters with 5.1:1 and 15.5:1 in an East Coast wheelbase
-sweet 1 1/4" x 4" Colsons, crown-flattened and with a lightweight hub straight from BaneBots. I will add pics of these later; they deserve a spotlight!
-220 degree arm rotation, picks up and shoots from the front or the rear
-nice 'n easy piston-only ground or kiss pass

Ask if you've got any other questions!

[evanatch]

I like this design a lot - a very elegant way to do a double sided pickup/shooter. See you guys in Utah and Denver!

[Lil' Lavery]

Glad a couple teams went through with this idea. I had toyed with the idea, but our initial proof of concepts with wheeled shooters had very poor results, and we didn't have the time or manpower to go further down that path. Part of me still wishes we did.

What speeds are you running your shooting wheels? How much compression?

[mrnoble]

Glad a couple teams went through with this idea. I had toyed with the idea, but our initial proof of concepts with wheeled shooters had very poor results, and we didn't have the time or manpower to go further down that path. Part of me still wishes we did.

What speeds are you running your shooting wheels? How much compression?

Thanks for the vote of confidence. We went this direction because, for us, our previous experience made it the most comfortable fit. It was really a lot easier for us than the other options we saw and/or prototyped.

We are running miniCIMs with a 4:3 reduction, so 4650 free speed. Compression is 4.75" on the nominal ball size.

[Trey178]

It is not a pneumatic punch.
The wheels used for pickup are thrown into reverse and the piston just moves the ball into contact with the wheels.

Oh, well now it definitely seems a good many teams are using wheels either in their shooter or their ball intake mechanism.

Very nice shooting mechanism. And glad to see another robot with a pneumatic punch.

Saw an image of your robot on your team Facebook page. How does yours work?

[kdhir]

The Robot looks Awsome! Great Job!

We actually have a similar design and were wondering what you are using to power the wheels from the Cims. Is it V-belt, timing belt, chain? We tried using V-belt but are having a lot of problems with the Cim not being able to get past the friction in the V-belt and pulley. Do you have any suggestions?

Also what type of metal are your shooter arms made of? Is that just box aluminum?

Thanks so much! And Good Luck!

[AllenGregoryIV]

I like the shot of you punching a ball out of another robot, though they had the same color bumpers which is probably bad. I wonder how the referees will call something like this, it will be hard to tell if a team actually just hit the ball or if it hits part of the opponent robot inside their frame perimeter.

[IronicDeadBird]

The Robot looks Awsome! Great Job!

We actually have a similar design and were wondering what you are using to power the wheels from the Cims. Is it V-belt, timing belt, chain? We tried using V-belt but are having a lot of problems with the Cim not being able to get past the friction in the V-belt and pulley. Do you have any suggestions?

Also what type of metal are your shooter arms made of? Is that just box aluminum?

Thanks so much! And Good Luck!

We used 9mm HTD timing belt to power the wheels. As for the materiel it is just plain aluminum tubing.
Expect a follow up on suggestions.

[mrnoble]

I like the shot of you punching a ball out of another robot, though they had the same color bumpers which is probably bad. I wonder how the referees will call something like this, it will be hard to tell if a team actually just hit the ball or if it hits part of the opponent robot inside their frame perimeter.

When the students that made the video premiered it in class, those of us that had been at the scrimmage laughed out loud. That was a very tense moment for us, as our driver was just testing the physical limits of the bot and didn't mean to contact the other robot. We weren't alliance partners, as everyone there just used whatever bumpers were convenient. We apologized to the other team and learned a few valuable lessons. It was funny that the videographers chose to show that particular error to the world.

The belts pass through the arms, which are 1/16" tubing. We chose the thin material for its weight on the moment arm, but it's been a lucky choice in that it will break without damaging any other arm or robot parts (learned by experience). We can bring extra arms and change them out with a pretty quick turnaround time.

[mrnoble]

Just want to make sure it's super clear that nobody on our team thought the foul was cool; we laughed at the video because we remembered how embarrassing it was when we drove into the other bot. I thought the kids handled it well afterward, but like I said, it was tense. No one wants to be the team that damages another team's bot, and that one could have ended badly. 3200 were great sports, BTW, kudos to them.

[AllenGregoryIV]

Just want to make sure it's super clear that nobody on our team thought the foul was cool; we laughed at the video because we remembered how embarrassing it was when we drove into the other bot. I thought the kids handled it well afterward, but like I said, it was tense. No one wants to be the team that damages another team's bot, and that one could have ended badly. 3200 were great sports, BTW, kudos to them.

Did you actually make contact with their robot? I didn't look that closely in at the video. If you didn't contact the robot in the frame perimeter, is it a foul?

[mrnoble]

Did you actually make contact with their robot? I didn't look that closely in at the video. If you didn't contact the robot in the frame perimeter, is it a foul?

We did indeed. Here is a new video, just finished editing, with the same scrimmage from a different camera and from more of a journalistic perspective. It also includes footage of the team's response to the accident in autonomous that caused the arms to break. It's nice because it shows some of the mechanisms up close, and also because it lead to several improvements being added before Bag & Tag.

We've been very fortunate to have several students willing to take on videography this year.

http://youtu.be/I-Q1fHMzZEg

[OWilliamson]

Awesome looking bot 1339! Our team is looking forward to playing with you guys in Utah in a few weeks :)