pic: FRC488 Running Laps



We made a makeshift center divider and got started running laps last night. We’ll have something like this set up at each meeting and have students driving as many of our chassis as possible simultaneously so they get as good as they can be at weaving through traffic and posting good times.

Madison, that is the nicest looking robotics shop I have ever seen! I don’t know where all the tools are but it sure looks nice!

This is the atrium of the building our shop is in :slight_smile:

The shop is off to the left and pretty well-equipped for making things, but less so for running robots around in circles.

I see a camera man and a boom operator to the left there. How’s the documentary stuff going?

man i cant belive i missed that i really wanted to be there…stupid work o well see u thursday we are ready to pwn…

This was the practice chassis, Amit. Most people didn’t stick around long enough to see the competition robot run. We’ll drive that one around more on Thursday.

It’s, uh, going. I’m not a fan of reality television.

have you gotten a rough number as to your lap time?

The best the kids were able to manage was sub-10 seconds, but the average was probably closer to 13-15 seconds. Things will slow down some as we add weight to the drive trains and more again when we get more robots out on the “field”.

Our of curiousity, are those numbers with a mecanum frame or a more typical six-wheel frame with a lowered middle wheel? If you tested both, what was the average difference between the two?

They were getting those numbers with both our practice and competition drive trains running default code. The competition chassis is a bit harder to handle, but faster for those who can tame it as a result. The practice chassis has too much traction in the turns and slows us down.

Have you tried casters on the front or back?

We were thinking of using them, but starting may be a bit of a problem since they don’t like to always start in the front…then again, there are the ones that do…

But, if you do try it out, it might be better for some control over turns. We’re going to try that out sooner or later…

anyway, we’ll be sending some e-mails to you guys in Seattle to update on gathering dates.

You can use omni wheels instead of casters so you can slip for turning, and still get power forwards and backwards. It takes a bit more weight over casters because the wheels have to be powered for the effect. You could use omni’s without powering them as a better alternative to casters also, as they wouldn’t have to swing around to get into position.

I’m not sure if its in a different thread or not, but wht drive system are you using, I heard mecanum and six wheel in this thread, have you decided which you are going to use??

What surface is that running on?

What was the distance that the bot was run? That is, how long was the stretch you drove it on? We were thinking about making a “lapbot” (a robot that just drives for scoring the 2points for doing a lap and maybe some herding). Is that what you guys are going for?

How fast could you get your bot traveling fps(feet/second) or mps(meters/second)

ok better question, what is maximum out put in newtons(or joules can’t remeber which is correct) or pounds/square inch or the motor you were using, if i could have the seral number (or the motor(s)) that would be fantastic.
thnxs

p.s. asking if you don’t feel like answering…
p.p.s. are you even answering

The only motors we are allowed to use are listed in section 8 under <R59>.

the most powerful out of these, and thus most suited for drive train use, is the 2.5" cim. You can use up to four (4), and no more. A picture can be found in section 10, they where packed in the black tote.

a speed vs. torque graph can be found, along with a table, in G.5.2 DC Motors (Guidelines, Tips & Good Practices). Watts under normal load is 205, according to the table.

there should be a nos button

It’s moving somewhere in the neighborhood of 12-14 ft/s right now, but it’ll slow down as we put more weight onto it.