The Barrier Thread

So lets talk about the barrier. The thing is a lot taller than you would think at first glance; 4". The 6" standard 6WD can’t get over it, it would seem, though I would like to see someone do the math. Can the kitbot get over it?

Anyhow, how important do people think going over the barriers will be? And how do they plan to do so?

Reaction while watching animation: “Pssh, it’ll be easy, no different than going over the bump/ridge that divides tile and carpet(If that makes any sense)”

Reaction after ::rtm:: : “So let’s get to work on deciding our bridge-going over mechanism”

A kit bot with 6in wheels could get over it if you had some spacers between the wheels and frame. This would raise the frame just high enough to let it get over. Not sure how bumpy it would be but it could work.

Actually you can get a 6" wheel over the barrier if you have the momentum and tread to do so.

Well if you have all six wheels driven and a full weight robot I think it would be quite easy. maybe not very effective. Heck it might damage the wheels after repeated use.

While I cannot give any proof on this, I can fairly certainly say you do not want to brute force over the hump; i feel you could have serious damage to your wheels. I saw teams break their wheels coming down from hard landings in breakaway.

We are thinking that with big enough wheels the barrier shouldn’t be to rough. I think it will be important to avoid traffic jams at the bridges but not important enough to warrant another system.

Yep, our 2010 robot broke one of her wheels.

Breakaway was a much higher drop, though.

EDIT: How would we do the math for this?

look at my signature link click on update 7 and see our video of what we were trying to do today.

But you had that little thing in front. Do you think something similar will go through inspection?

But what if you load your robot with an extra 90 lbs?

EDIT: And it also breaks the bumper rules; those are uncovered corners.

It will be underneath our bumper.

Is that even steel that you’re running over?
And the other two are correct; you’re violating bumper rules and your robot is very lightweight. In addition to this, because the person on the left didn’t hold onto the strip, your robot is not taking as much force. Also, the repeated attempts will put a large wear and tear on your wheels/robot.

How would you manage to put the bumper around that while still having an effect?

it is a prototype on the first day and we have other thoughts of getting over the barrier.

come on we have not thought of everything yet just wait in the next couple days we will have something.

To everyone who thinks you can cross the bump unaided (that video shows what lifting the robot before the wheels hit can do) with 6" wheel, I’m fairly sure that is wrong. The center of your wheel is 3" off the ground and as such you would ram flat into the metal. MY guess is that you’d break the wheels or send your robot hurtling head over heels before it would go over the bump. Even a 8" wheel would be sketchy, because it is level with the top of the metal. To be certain you would need 10" wheels.

or you can have pneumatic wheels

I believe what you’re looking for is shear stress analysis.

If the side-profile of your robot is trapezoidal-esque - that is, you have powered wheels elevated above the ground - you’d be able to do so with 6" wheels.

I don’t personally believe that people will break their wheels by anything, including driving into the rail (which is steel, as can be confirmed by the CAD) - if they do, it’ll be because the wheels will have already experienced heavy damage - but I do expect to see wheels damaged by collisions and impacts. Plactions will crack very easily if you abuse them enough.

My question on math was how we would calculate if a wheel can climb a surface, my bad.

Then you’d be comparing the net upwards force (acceleration and friction) to gravity.