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 The Championship, The Championship Event, The World Championship, The international Championship, Internationals, Champs, Nationals, Nat's, ATL... I just call it the best time of my life. - Kyle [more] |
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Here's us with a stack. We can carry up to 4 securely (you can see the little one-way flaps attached to the mast), and have tested up to ten (gets REALLY floppy though when that happens, and it takes waaaaay to long to get that many one at a time). Once the boxes are secured with those hinges, there is ABSOLUTELY NO WAY that they are coming off - you can even punch them and they don't move.
You can see the arms at the base swept forward to orient the boxes. This cuts the time needed to get a box (or a stack) aligned down to almost nothing - just run into it and squeeze.
The forklifts also use a one-way hinge system to grab on to boxes, so there are no complicated motor or pneumatic systems involved.
Extremely good at stealing stacks. We're even working on our autonomous section so that we can steal enemy stacks during autonomous mode. (I don't quite know how effective that'll be though).
Yes, I know that most of you out there are saying that stacking this year is not to go (personally I agree, at the UTC scrimmage, we hardly stacked at all). However, we've found that we can steal enemy stacks within 2 seconds or so, and protect them until the end of the match. Hopefully it'll come in handy sometime....
Discussion
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20-02-2003 22:41
Solace
any thoughts?
you can find more pictures at
http://www.chiefdelphi.com/forums/p...ngle&picid=3996
and
http://www.chiefdelphi.com/forums/p...ngle&picid=4000
21-02-2003 15:26
Solace
we're trying to refine our strategy in the weeks before the competitions, so any input that we get would be helpful (especially if you percieve any weaknesses).
21-02-2003 15:42
Jeremy_Mc
EEK!!
i would watch those PVC pipes!
one team had some of those at our exhibition and they got snapped! 
don't mean to criticize, just warning. i would carry many many extras.
*jeremy
21-02-2003 15:49
Solace
if no one critisized us we would never get any better.
ACtually, the pipes will evolve. We made different arms without fittings (they were slightly thicker and heated and bent into shape), but we didn't have time to attach them so we just threw them into the crate
21-02-2003 16:22
Katyis it overweight? Also can you rotate the boxes when you pick them up?
It all and all looks like a very sturdy frame, Al or steel? It almost looks like it could be steel but that would be way way too heavy. Also, I know you are probably not made to be a pushing robot but what about traction? Those wheelchair wheels are not good on that stuff at the top of the ramp.
Also, could you tell us what you think of ours? It now stacks five crates and is 3 pounds underweight. http://www.chiefdelphi.com/forums/sh...threadid=18145
21-02-2003 21:50
Solace
we are 128.8 lbs. The captions on the image itself, along with the other two, gives a lot more info. If we tip our mast to the full upright position and move our forklits to the right spot, they are the perfect hight for flipping over boxes (even if they're all the way upside down). So if there is a box standing on end, we move our forks to the right spot, drive into it and knock it over, and squeeze the lower arms. The arms are bent into a certain position so that after the stack is upright, it will conform to the shape of the arms when its squeezed, putting it in perfect alignment for the one-way check valves on the forklift. we wanted to be sure that we didn't waste any time attempting to orient ourselves with the box, so instead we decided to orient the box with us.
we were going to go with steel, but in order to save weight we decided to go with beryllium (we're hoping the judges won't notice:rolleyes
Actually, its made of 3/4 inch plywood. surpirsingly sturdy stuff, we took the idea from our mentor, RAGE 173 - they did happen to win the national championship, so we have proof that it works.
The back wheels don't have much traction. We had to put them on because originally because we had so much traction that we couldn't turn (even with our 4 motors). However, the front wheels are still the original 8 inch pneumatic tires, and they stick like glue. Also, the center of gravity is more towards the front of the robot, so most of the weight is transmitted into the pneumatic tires.
Sure it spins the back tires a bit, but it can still pull me at 165 pounds (although slowly) across the floor. So far though we've found at the scrimmages that this game is more about speed than power. we can pull 12 ft/sec, and with high maneuverability we hope we can just go around most of the people in our way. (yeah pivoting axle!)
I see that your bot has a pivoting axle too. Ours doesn't pivot front to back like yours (you don't need that if you are using 4 wheels), but its the side to side action that lets you approach the ramp from any angle. Is that the same thing on yours?
cool bot in all, but it seems to me that when you pick up multiple boxes at a time they aren't held very securely. You might want to consider using guides or one way check valves like ours in order to hold them more securely. because of the check valves, we can lean our mast back and run around the court at full speed (on the ramp and off) without them falling off. They really aren't that hard to make, all you have to do is have the boxes all the same orientation when they're actually being held by your robot.
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