i also find the possibility of 2 seconds VERY VERY improbable...

you'd have to be moving at a speed greater than 12 FPS even while turning.

i can see maybe an arm reaching up and hitting them or something of that nature, but a bot running up the ramp that fast is very unlikely.

we get up there in about 5 seconds. yes i know that's a pretty slow time, but we're not about the speed.

*jeremy

the last time i checked, our bot was doing 15 fps on carpeted surfaces. that goes down to about 10 on rounded turns. we make it up the ramp (to the boxes) in just under 3 seconds. i love our drive train. oh, and by the way, thats in low gear.

I agree... We call it autonomous suicide...
I expect to see quite a few robots damage themselves, perhaps even terminally during autonomous rounds...

As for your comment about white smoke pouring out...
Shouldn't a properly designed low gear spin the tires when at "static push". If done correctly a robot can push against a wall for 2 minutes, and still not over stress the drivetrain.

I know that's how I designed ours. :confused:

We made our if it hits the wall we will push the wall down. We make sure we have more traction than not.

We saw last year people that had good traction get flipped over because of there traction and were they grab the goals.

And we saw robots burn up there motors.

So I would say you will See at lease 4 robots in each of the regionals burn out there motors and that is on the low side

We hit the boxes in 7 seconds at the best.

How fast are your times with totes stacked in front of the ramp or all your times with a clear shot? It makes a difference to our bot.

low gear? Do you guys have any power or torque at all?

3 guys pushing against the bot cant stall it...

what motors are you using?! :yikes:

if you're using drills, you'd have to have really small, really slick wheels just to get started. then you'd have to have REALLY big wheels to retain that speed.

there's no way you can have them in low gear, get that speed, and still be able to overcome the static friction of wheels with any sort of competitive traction.

*jeremy

i hope your coming to Richmond, because all i can say now is that no, we do not have dynamically changing wheel sizes, and yes we are using the included drill motors...

I expect the fast teams to be there around 3 seconds to 3.5 seconds.

Very few teams, if any, will be there in under 3, and I expect to see no more than a handfull around 2 seconds at nationals.

Expect most teams to be around 4.5 seconds.

we are a distance measurer and can get to the totes in about 2.5-3 sec

just the highlights

wow..... http://www.hookedonphonics.com

OK...you say you're using the drills.

This is the spec's of a drill (the fastest motor):
461.52 RPM geared down minimally (the provided gearbox).

Now, let's divide this by 60 for Rotations Per Second (RPS):
461.52 / 60 = RPS
7.692 = RPS

Now that we have that, let's figure out how far you'd go on one rotation. Basically, your rate of speed. We'll use 8" wheels as a control size.
8 * 7.692 = 61.536

Next, we'll figure out the distance traveled.
(1' space for transfer from alley to scoring zone) + (Pi * 4' for the circumference of the circle) + 8' up the ramp
1 + (4pi) + 8 = 21.594

Convert to inches.
21.594 * 12 = 259.128

Now, let's figure out how long it would take you...
259.128 / 61.536 = 4.2109~

4.2 seconds.

WOW! THAT'S TOTALLY TWO SECONDS.

or not.

that's about as fast as most can expect (many teams will beat this...many teams won't). it's all relative to gearing...

anyhow, if you can get two seconds by running up the ramp, i'll give you props. but i wanna see it before i believe it.

*jeremy

4.2 sec? well thats one perfectly theoretical calculation, congrats. you assume that we have two powered wheels and that we use the wheels that first gives us. and i never said 2 seconds; i said 3. -Jacob

Well I do like to think that they are kinda fudging the truth a little, But I won't say they are completely making that up

Right now we are running at 7.7 feet per second and we get up in about 3.3 seconds ( thats to the middle 5 high stacks ), We have arm that reachs up a little before us but we also have front wheel steering so we can make a lot tighter circle than the one provided

now if we would like we can make it faster by changing a few sprokets and mayb it will make it just under 3 but any faster I doubt

Right now we also have a 1:21 gear ratio on the chip motors so we get a good amount of torque, ( not as strong as I expect team 61 to have or some others but more than a lot of teams will have runnin above 10 fps )

Especially if they are running the drills stand alone

Now without our arm in prelim runs we were running in about 2.4 seconds to the top of the ramp .. So to say 2 seconds is impossible I dare not venture, and No one need lie about it because it would make people all the more dissapointed to go to competition with false hopes, and develop a sense of irritation towards your team.

But there will be teams that get up there dang fast

Now ImO dead reckoning is the fastest but will also cause a chance for a lot of " autonomous suicide " the reason why I believe this is because we are running a basic stamp with a slow calc. speed, the autonomous programs i've seen the bot spends to much time scanning for the line and to little time going to the top

You can see a lot of our pics ( we have tons ) Here

hopefully we'll have some finished pics with our lexan and graphics and our film of stacking boxes and/or getting to the top for everyone very soon