Re: Team 67's incredible shooter
 

Thank you for the responses Mr. Freeman, I appreciate your openness. We've been very inspired by your team in the past and this year is certainly no different. :D

Re: Team 67's incredible shooter
 

Thanks for sharing this information... I hope when the season is over other teams will share these numbers as well and what methods they used to work out how to come to these decisions.

Re: Team 67's incredible shooter
 

Good to know.... We've been using the green wheels all year (not sure if there was any particular reason), and we did see a LOT of wear after our first event Northern Lights - even having to replace all 3 mid North Star. We may get a hold of the orange and blue ones to try them at champs (or at least have them on hand).

Re: Team 67's incredible shooter
 

What do you like best about 2169's shooter? I couldn't seem to find a picture of it anywhere.

Re: Team 67's incredible shooter
 

I just liked the way it shot. It had a very high release point, that was very hard to block.

I'm not sure I saw it miss in any of the matches that I watched from the Colorado Regional eliminations.

I haven't really seen pictures of it....just videos from the webcast. I will definitely have to check it out in St. Louis.

Re: Team 67's incredible shooter
 

I think it's interesting how differently the two long-range shooter whose shooters I've seen approached the FCS concept. While 67 is using three banebots, 195 has a GIGANTIC wheel on a circular shooter. It's awesome.

Re: Team 67's incredible shooter
 

I can only talk to what we did. In our case, we were trying to keep the weight of the shooter down as much as we could, since we were going to be tipping the robot back to climb up the corner.

I'm not really sure how much weight savings we actually achieved, since I believe the shooter assembly (shooter, plate, frame, etc..) ended up weighing about 15lbs. So when you add up all the bearings, bearing blocks, wheels, and other parts the weight went up pretty quickly.

We prototyped multiple shooter configurations, but the linear style offered the best performance for us, given the packaging configuration we had to fit for the climber.

Once we added the third wheel, we really started to get the FC distance we needed. Without it (double banebot wheels) we were only getting about 40'.

Re: Team 67's incredible shooter
 

Might be a strange question, but why only three wheels as opposed to 4, 5,6, etc? Weight, practicality? Was there something that made 3 the "sweet spot"?

Re: Team 67's incredible shooter
 

That's just what we needed to get the distance. I can't say we thought about adding any more than 3.

We did experiment with a wheel on the opposite side of the main shooter wheels, to eliminate curve. But, it didn't do much and kinda got forgotten about.

Re: Team 67's incredible shooter
 

That is an interesting reason to try the wheel on the opposite side... we thought about that for the reason to trade less angular velocity for more linear.


The 3997 screaming chickens have a circular shooter that I believe could have been long range, because man that thing had some serious power at close range, low to ground feed drive, steep angle... when it scored the 3 point... it went in about 45 degrees with no hint of even coming close to leveling out... it slammed into the goal. I personally like this.

Re: Team 67's incredible shooter
 

I think 67's curve really seems to help their FCS ability and I wouldn't make an effort to eliminate it. However, for those of you reading this thread looking to copy 67's shooter but without the curve, I thought I'd share a tip. We built a somewhat similar shooter this year (multiple orange Banebots on a linear shooter, hitting about 40-45 feet with two of them) and had a similar curve to 67 near the end of our trajectory. We found that for us, the best solution was to constrain the frisbee as much as possible in the shooter. While a 2" opening would often result in a frisbee that veered in one direction after about the 25 foot mark, a smaller opening constrained with smooth plastic (especially on the side with the wheels) would always go perfectly straight.

I really admire the 67 robot this year. I think it's a design strategy a lot of teams attempted in various ways, but few could execute so well. I wish we were smart enough to come up with some of their design details in season, but I highly doubt we could have executed like they have.

Re: Team 67's incredible shooter
 

I wonder if that might have had more to do with disc wear than wheel wear? We were seeing some pretty nasty discs by the end of quals at MSC.

Are the game pieces at CMP usually brand new?

Re: Team 67's incredible shooter
 

For a couple of rounds. Then they usually use new ones for elims.

Peyton

Re: Team 67's incredible shooter
 

How constrained did you make it? You said that a 2" opening didn't go straight enough so that you made it a smaller opening. Did you make it as small as 1.5" or closer to 1.75"?

Re: Team 67's incredible shooter
 

I'd have to measure to be sure, but it was pretty close to 1.625. We machined 1/2" delrin stock down, adding a taper to the loading end, and placed it on the top wall of our shooter. One stick close to the wheel side, one stick close to the wall side. The main effect was getting rid of our height variation but the curve disappeared too.