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pic: Team 846 Presents: Funk Cannon
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Re: pic: Team 846 Presents: Funk Cannon
Nice machine! You'll do well.
I like how the intake keeps the ball in control until just before you fire the shooter; a small detail that will save you headaches during bouts of defense on the field. What has your experience been with those 'W' tread wheels? How long do they last you? |
Re: pic: Team 846 Presents: Funk Cannon
Another fabulous intake system from you guys. Do you have active control of the ball at all times when its in the robot? That's how it appears to me but I'm not quite sure.
Good luck this season, I hope you can get that regional win this year! |
Re: pic: Team 846 Presents: Funk Cannon
Sky restraining order.
Nice. |
Re: pic: Team 846 Presents: Funk Cannon
Great robot this year! Best of luck this coming week. I know that as soon as the competition bot is updated with the changes on the practice robot you guys will be a force to be reckoned with.
On a side note, I think this is one of the few years that I agree with the voice to use omni wheels. I'd love to see a defender try and pin you guys without you just spinning out of it :) What's the final weight? Also, can you describe the mechanism that pulls back the shooter? I would love to know more about it |
Re: pic: Team 846 Presents: Funk Cannon
Assuming your video isn't just showing us the good shots, and your shooter is consistent, it looks like you've got a nearly perfect bot there! Can you share how you choke the power & angle to get your short shot?
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Re: pic: Team 846 Presents: Funk Cannon
All I can think about when I see this video is "wow, I wish michigan had that weather right now..." On a side note, beautiful weath...I mean robot!
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Re: pic: Team 846 Presents: Funk Cannon
Tell me more about that drivetrain, looks like you have the outer wheels as omnis for less turning scrub but the center wheel for traction to avoid being pushed around. Very cool bot.
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Re: pic: Team 846 Presents: Funk Cannon
Amazing machine from 846. Can't wait to see y'all compete.
On a side note, am I correct when I see no Jaguars on your robot this year? Have you moved on from CAN and have joined the PWM world? |
Re: pic: Team 846 Presents: Funk Cannon
Alright, So while the team is flying to Ohio, I'll do my best to answer some questions. They can fill in the gaps later
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To answer a few of my own questions (now that I know some more) Final weight is 99 pounds. I dont understand the details of the mechanism for retracting the springs well enough to describe it, but it is cool... |
Re: pic: Team 846 Presents: Funk Cannon
Man I love the detail work on this robot. Functionally, it's very similar to my team's robot (4488) but I like some of the different approaches you had to the same problem. I have to mention that your choo choo design and 2 level shooting mechanism are beautiful. It made me smile and forward this to my team to admire (and learn from). Best of luck to you guys!
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Re: pic: Team 846 Presents: Funk Cannon
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Re: pic: Team 846 Presents: Funk Cannon
All right, sorry for the late replies; we started traveling this morning and are at last happily situated in our hotel right now. Thanks for all your kind words, we love Funk Cannon and are excited to put her to the test on the field tomorrow. To add on to what Chinmay's said already:
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At the 17 second mark of our video (http://youtu.be/92IbHU0Z76I?t=17s), you can see the little latches that fall into place next to a slotted tube. A little aluminum piece, with two pegs that stick out of the slots, is attached to a threaded rod that the shooter arms drag back and forth when reloading and shooting as shown at the 24 second mark (http://youtu.be/92IbHU0Z76I?t=24s). When we fire the short shot, the pegs hit our deployed latches, limiting the travel of the arms and increasing the angle of the shot. This also limits the change in spring compression, resulting in a lower energy imparted on the ball. When we fire the long shot, the latches are retracted, and the pegs instead hit the end of the slots in the tube. More energy is released and the ball leaves at a lower angle for the longer range shot. In both cases, when the pegs are stopped, the threaded rod will want to keep pulling through, compressing die springs that absorb the remaining energy, allowing us to safely perform our shots as well as dry fire. After Buckeye I can post some close up pictures of the mechanism, if anyone is interested. Just let me know. Quote:
I won't say we avoid getting pushed around. It doesn't matter as long as we're in range to make the shot. More important to us is that we're slippery; as Chinmay mentioned before, I think it'll be hard to pin us down, as we'll just spin out of it and continue on our way. Of course, that's only what I know from the robots we've practiced against. Maybe Buckeye will prove me wrong; we'll see. |
Re: pic: Team 846 Presents: Funk Cannon
Also the reloading mechanism is a crank, JVN style, with some optimization. We also added a slot so that when the shooter arms have been stopped early for the short shot, we can still continue cranking until we pull the shooter arms out from under the short shot hooks so we can disengage them and choose which shot we want to do next.
In order to get a large reduction conveniently, since our required torque is fairly large, we use a worm gear setup. This has the added benefit of no backdriving and allowing us to go in either direction without worries. Quote:
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Re: pic: Team 846 Presents: Funk Cannon
We generally played well at Buckeye, ending the qualification rounds as the 4th seed. We were selected to play in the #1 alliance by 910, and managed to pick up 639 to create the awesome Buckeye Regional winning alliance. #redfunkyfreeze
Here's a highlight video: http://youtu.be/-FytjA6-5Bc Best moment is at 2:12 with an awesome bank shot that made it into the goal. Sweet spot shots are good. We've made a few adjustments to our robot since Buckeye to shoot balls of different inflations more consistently, as well as improve human loading. Hope to see it pan out well at SVR. Also, we never replaced the Versawheels. They wore quite a bit, but our driver liked drifting a little bit. As long as the drift remains controllable, we'll keep it. VEXPro Omniwheels also held up well. |
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