Self-righting

i was wondering are there any robots out there that can right themselves if they fall over during the competition? In other words, can any robot can stand itself back up should it accidentally tip over during the competition? I don’t really see many bots having that ability this year as there was last year. Please feel free to share your thoughts and comments on the subject even if your robot does not have the ability to right itself.

Most of the time when a robot was able to correct a fall it was due to their arm design. There are no arms this year so no way to correct a fall. Once you’re down, you’re down for the count.

Ohh god now all I can think about is our robot tiping over. . . .

believe me its been blazing through my mind for weeks now I was just wondering if any team took measures to correct the tipped cow situation… because quite a few of robots seem to be built taller with more top weight making them more susceptible to being tipped over

Happened to us at our last practice. A ball got between us and the ramp, and…boom. shudder

I KNOW! you just shoot the balls down very rapidly and the reaction force will tip it back up!!! but seriosly, we don’t have a tipping problem (thank god) in testing we rocked it all the way back to about 45-50 degrees and it still righted itself when we let go. Yay for low CG!

Tipping will be a very common occurance this year:

  1. Because of so many tall robots
  2. Because of the steep angle of the ramp
  3. Because of the physical nature of this year’s game.

We tried to combat this by building a robot that is under 3 feet tall but there is no garuntee that we won’t get tipped over (I remember at IRI last year after Rush Robotics arm exploded intp pieces they took it off and just ran thier hulk on the floor for the next match and they still ended up on thier back (I think they ran up a wedge bot).

As one of the technical mentors showed me (as I was screaming at him), it would take a pretty good fall for us not to be able to get back up. I think that they have so much weight in the front that it just pops back up again.

similar thing happened with ours but due to quick thinking by the driver throwing the drive wheels in reverse as the front of the robot went airborne thus the front slammed down bending the battery holder slightly due to the impact of the 120 lb robot slamming back down. you can imagine the collective gasp that occurred or maybe you experienced it yourself

we may have a problem with our bot, its .2" under the 5 ft limit :ahh:

11 Days til FLR!!!

front weight would only help if your robot tipped back but supposed it gets tipped over forward while being rammed.

Anyway I am currently trying to figure out how to reduce the chance of tipping over because a sideways robot is essentially useless…

Height isn’t going to be as much of a problem as weight distribution. A robot that is exactly 5 feet tall, but has nothing but PVC and netting above 2 or 3 feet should be just fine. Only those who have motors and launchers (or other heavy items) up high should be worried. Careful driving and knowing the limits of your machine can also help you from getting tipped over. Good luck to all teams!

You guys seemed to get up the ramp pretty easily at Penfield so I think you’ll be alright so long as no one is pushing on you.

We tip kinda easily if we run over a poof ball to fast, but we have gotten used to it and realized how to fix it, I don’t know how the driver does it but he does a good job of it. We’ve had several close calls but he’s fixed them all. But as for part of the robot helping, we don’t have that, but I seriously wanted to. The only time we can’t fix our selfs is when it comes time for the ramp.

Now that I’ve said this, watch us flip at regionals.

It’ll be our luck

can anyone think of a way to reduce the risk of tipping without redesigning the robot or adding much weight? ( our robot is at the weight limit assuming our scale is accurate but I am hoping the scale added weight to the robot that way we have room to make little add-ons come practice day)

to solve our problem with tipping, #340 has designed a wheelie bar that comes down when needed to keep the robot down while going up the ramp. it weighs all together including the pneumatics 4 pounds.

well that wouldn’t work for us but maybe we could use a light weight wheelie bar just have it pulled in slightly or something

Unless you’re gunning for the ramp, I don’t think you seriously need to be worried about tipping. Our robot last year was unable to right itself, and it extended up to 13 feet in the air. We got hit with our robot holding tetras at least 9-10 feet in the air, and the only time we ever tipped was because another robot’s arm became entangled with ours and pulled us down.

Without high extensions or wedged robots this year, tipping is one of my least worries. Those teams that took advantage of the bumpers will be in even better shape with an extra 10-15 lbs. on the bottom of their robot.

Our team hasn’t experienced any problems with getting poof balls caught underneath us, but that will be an individual issue depending on what your robot’s ground clearance is. Poof balls under a robot “bouncing it” onto its side would be the only way I see teams getting tipped UNLESS they go for the ramp.

Quick explanation for beth’s comment, as i was the one ignoring her screams:
i was able to tip our robot so that the highest most point was about 1ft from the ground
as we stand now our robot is only 68 pounds (we will be adding more) but of those 68 pounds, 65 of them are within 9 inches of the ground because the rest is just a hopper. we also plan on adding an extra 50 to the chasis at the competition, as well as battery and bumpers. So in the end, we should have about 140/145 pounds within 1ft from the ground spread out through the entire chasis
needless to say, with such a low CoG, we shouldnt have any tipping issues with our bot

Our robot had a small problem of tipping coming off the ramp due to a higher-than-wished CG. We solved the problem by writing a ramp unmount procedure and by adding several pounds to the front (we were underweight by like 9 pounds.)