27-01-2013 20:49

CalTran

Re: pic: 319's Small Wheeled Shooter

This, in fact, confirms my hypothesis that a shooter does not need a "middle," and that a disc can easily ride rails. Thank you for the post. (I do wonder if there is a middle underneath the frisbee keeping the "rails" together though. That "middle" is necessary.)

27-01-2013 20:51

MattC9

Re: pic: 319's Small Wheeled Shooter

Video?

27-01-2013 20:52

Ty Tremblay

Re: pic: 319's Small Wheeled Shooter

That "middle" is there. We noticed that compressing the discs was actually causing them to bend, meaning they weren't touching anywhere but the outer edges anyway, so we took the middle out. It works just as well as our shooter prototypes with middles.

27-01-2013 20:52

BrendanB

Re: pic: 319's Small Wheeled Shooter

You can do without it. Our original plan was to leave the middle of our shooter empty so our climbing arm can fit down the middle of the robot.

27-01-2013 20:53

kingbrandon14

Re: pic: 319's Small Wheeled Shooter

I think the main reason that it works with this design is because the wheels are basically flat, so they can be relatively parallel with the c-channel walls, leaving room for the disk to slide on the base of it. But good point!

27-01-2013 20:56

Ty Tremblay

Re: pic: 319's Small Wheeled Shooter

Here you go. We still have some playing to do with shooting angle, compression, wheel durometer, and other things. We just couldn't wait to try it out though.

27-01-2013 20:59

AllenGregoryIV

Re: pic: 319's Small Wheeled Shooter

Very cool implementation, I like the idea of different wheel diameters to get different surface speeds.

I can't tell from the picture, what motors are you using?

27-01-2013 21:02

Ty Tremblay

Re: pic: 319's Small Wheeled Shooter

We're using a 550 through a 4:1 planetary on each wheel. The design was actually inspired by your prototype. Thank you for posting it!

27-01-2013 21:06

CalTran

Re: pic: 319's Small Wheeled Shooter

Single motor to control both wheels? If so then that's a clever way to save weight.

27-01-2013 21:11

AllenGregoryIV

Re: pic: 319's Small Wheeled Shooter

We're happy it helped. What are the wheel diameter's right now?

27-01-2013 21:13

Ty Tremblay

Re: pic: 319's Small Wheeled Shooter

Negative. One motor on each wheel. We felt that coupling the wheels would be a "double jeopardy" of sorts (when the first wheel slows down, it'll drag the second wheel with it). Also, doubling the power allows the shooter to recover more quickly between shots.

27-01-2013 21:14

Ty Tremblay

Re: pic: 319's Small Wheeled Shooter

Right now we're running a 2-7/8" on the first wheel and a 3-7/8" on the second wheel.

27-01-2013 21:22

CalTran

Re: pic: 319's Small Wheeled Shooter

Ah. Next question would have been something along the lines of asking the tradeoffs and the worth behind it. How do the Banebot wheels do on getting back up to speed? We just ordered a set for our shooter.

27-01-2013 21:26

Ty Tremblay

Re: pic: 319's Small Wheeled Shooter

We haven't had a chance to extensively test it, but we also haven't been able to put frisbees through the the shooter fast enough to slow it down. Take that as you will.

27-01-2013 23:02

nathannfm

Re: pic: 319's Small Wheeled Shooter

Have you tried any slighter angles to the ground for more distance? Is it giving them enough push to make it somewhat across the field?
(or maybe that isn't your goal)

28-01-2013 11:36

Ty Tremblay

Re: pic: 319's Small Wheeled Shooter

We still have some adjusting to do. That's why we tried to get it functional as fast as possible.