It’s a monster drive train (66.2 lbs!!), and we’ll be able to viciously handle one goal. . . we’d planned on two, but the aforementioned drivetrain weighed a bit more than I had anticipated.
Please tell me your wheels are attached by more than that little connector. As far as I can see, that’s all that’s holding it on. Those aren’t particularly strong and that’s going to be taking a lot of force.
*Originally posted by Matt Leese *
**Please tell me your wheels are attached by more than that little connector. As far as I can see, that’s all that’s holding it on. Those aren’t particularly strong and that’s going to be taking a lot of force.
Matt **
Well, even though we’ve already discussed this . .
Yes, the axle plates are held in by more than the gusset. They’re bolted to the extrusion on the inside, and the entire wheel assembly is fixed by vertical posts in the center - to prevent sliding in the extrusion.
Yes, we have a very poerful low speed. We pushed a 150 lbs or so man down a tile floor. I’m almost scared about controlling that much raw power on the carpet.
When we pushed the guy down the hall, there were some kids from Hauppauge (another local team), and they were convinced when they manuvered their robot correctly, nothing would move them. Well, by the looks on their faces when we went down the hall, i have a feeling we’ll be one of the more powerful robots at the LI regional. Now that i said that though, there’s gona be someone even more powerful than us.
What i ment was, can you lift the goals to get more traction? I hate to sound this way but if your just using your 130 pounds for traction/friction you are not going to be a whole lot more powerful then other teams (unless you get a running start, oh boy ). My team dragged a 200 pound person on carpet, if you think about it the surface dosn’t matter, since friction is reduced for your wheels and the body of the person your dragging on tile. Oh well, it dose look like a beast of a robot!
*Originally posted by GregT *
**What i ment was, can you lift the goals to get more traction? I hate to sound this way but if your just using your 130 pounds for traction/friction you are not going to be a whole lot more powerful then other teams (unless you get a running start, oh boy ). My team dragged a 200 pound person on carpet, if you think about it the surface dosn’t matter, since friction is reduced for your wheels and the body of the person your dragging on tile. Oh well, it dose look like a beast of a robot!
Greg **
No, we can’t currently lift the goals off the floor, so we don’t have the added benefit of adding additional weight onto our robot.
Instead, we have a far greater contact area with the field than most teams, with a very, very ‘toothy’ belt. To be honest, I’m quite a bit more familiar with the design than it’s actual performance just now. I only got to see it working for a short period of time.
The most impressive thing about dragging an adult down the hall, I think, has less to do with the weight we pulled and more to do with the idea that there was no slippage in our drivetrain whatsoever. That was on linoleum. Carpet, of course, provides significantly more friction, and a better surface to react against.
Weight transfer is the answer to getting traction. Check out our two short videos of our robot crabing two goals in one and pushing close to 1/2 ton in the other. Notice that we are tranfering some of the goal weight onto our bot for improved traction.
Mike,
How much force can the drive system push/pull with? How much loses are in that complicated belt drive system? Have you tried to calculate out any of these numbers?
what we are amazed about is we had enough friction on lenoleun without any exttra weight. this also enables us to move much faster than other robots that puts half of the weight of two goals. by dragging two goals one also has to ensure that all of the wheels are facing the correct way.
that day we were also surprised that the whole time we didn't blow one fuse. and that was 210lbs 32ft down a lenoleum hallway. we really aren't scared of slipping!
“Ian”- don’t worry about controling the beast on the carpet because i will be right there with ya to make sure you don’t screw up my beautiful peice of technical and BruteForce achievement!
So, Mr. Drexel finally found the forums. Steve must have shown him. Tell us, how hard was the robot pushing you down the hall, cause you looked surprised that it seemed to be quite a bit stronger than you.
I guess im wondering what you do differently? Do those belts have any danger of damaging the carpet? They will probably help a great deal, but if they slip they are going to really make a mess.
Your probably not the only team that can pull people around on tile. I bet my team’s robot could do that, we just didn’t try. Remember that friction = u * Fn so you either increase the coeficient of friction or the force normal. Traction is different, and it looks like traction is what you exel at.
well Greg, michael and i design the robot to do much more but weight didn’t allow, (i bet you’ve heard that alot).
we are also a roockie team so Ian W, Michael and I are happy enough that it is working and that thee is not one bit of plywood used on the whole robot!!!
not to downgrade the work we did though, because, i think that we should do fairly well in the ring.
SO GOOD LUCK!!!!
*Originally posted by DaBruteForceGuy *
** we are also a roockie team so Ian W, Michael and I are happy enough that it is working and that thee is not one bit of plywood used on the whole robot!!!
**
Hmm…seems like somehow…I’m no longer part of the team. And, I remember commenting about plywood, but how easily I’m forgotten.
And Ian…you never sent me those pictures…I do need to submit the yearbook page…TOMORROW!
But yes, our robot is a tank this year. Drive carefully, all.
I sent them to micheal, i thought that he would send them to you! Grr, i’ll send them now, although i think micheal posted them already, not all of them on the chief delphi web site though.
). My team dragged a 200 pound person on carpet, if you think about it the surface dosn’t matter, since friction is reduced for your wheels and the body of the person your dragging on tile. Oh well, it dose look like a beast of a robot!