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Unread 21-02-2002, 14:11
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The Mechanical Bulls present. . .

Okay, so the kids are really proud of their machine, and I *know* you've all been itching to see some pictures.

So, we're proud to show the first pictures of the *almost* complete robot, El Toro.

http://www.chiefdelphi.com/forums/pi...rrow=4&trows=3

An overview. . .you can't really make out much but the shape.

http://www.chiefdelphi.com/forums/pi...&action=single

A close-up of the front end.

http://www.magenet.com/~imagination/ElToro/backside.jpg
http://www.magenet.com/~imagination/ElToro/cover_on.jpg
http://www.magenet.com/~imagination/...front_view.jpg

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.

If you've got questions, I've got answers

Cruisin' and bruisin',
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Unread 21-02-2002, 14:14
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Matt Leese Matt Leese is offline
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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
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Unread 21-02-2002, 14:22
GregT GregT is offline
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Are you guys 130lb friction limited? From what i can tell every team out there can spin it's wheels on the carpet.

I like the drivetrain, my team's train also weighed in heavy, whats your guy's top-gear speed (ours is geared for about 5-7 ft/sec)?



Looks like a battlebot,
Greg
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Unread 21-02-2002, 14:45
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Quote:
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.
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Unread 21-02-2002, 14:47
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Quote:
Originally posted by GregT
Are you guys 130lb friction limited? From what i can tell every team out there can spin it's wheels on the carpet.

I like the drivetrain, my team's train also weighed in heavy, whats your guy's top-gear speed (ours is geared for about 5-7 ft/sec)?



Looks like a battlebot,
Greg
It's meant to be tough. It's a pusher of extreme magnitude.

Our top speed is 10+ ft/s. Our low speed is about 4.5 ft/s.
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Unread 21-02-2002, 15:25
Ian W. Ian W. is offline
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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.
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Unread 21-02-2002, 15:49
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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
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Unread 21-02-2002, 16:23
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Quote:
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.
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Unread 21-02-2002, 16:25
Mark Jones Mark Jones is offline
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Mechanical Bulls, Weight Transfer and Traction

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.

Check it out at: www.metalinmotion.com
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Unread 21-02-2002, 17:34
Bob Drexel Bob Drexel is offline
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Question How much??

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?
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Unread 21-02-2002, 17:46
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speaking on behalf of my team

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!


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Unread 21-02-2002, 17:54
Ian W. Ian W. is offline
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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.
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Unread 21-02-2002, 18:03
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Steve is also trieing to find out what Bob thought about the pushing down of the hall. So what did you think MR BOB?
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***<Engineer> Neither, the glass is too big.---

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Unread 21-02-2002, 18:05
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so mike did you get any sleep lately?

wel anyway what is the force put out by our BruteForce Beast?
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---The pessimist complains about the wind, the optimist hopes that the wind will change... the realist adjusts the sail.
***<Therapist> Tell me, is the glass half full or half empty?
***<Engineer> Neither, the glass is too big.---

....Uh, GO NUTRONS!
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Unread 21-02-2002, 18:31
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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.

heres a video:
www.startateam.com/639/movies/2002_build_1.mpg

Hope to see you guys do well.

Greg
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