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Unread 11-03-2011, 21:44
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Re: Rookie Team 3729's minibot

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Originally Posted by Grim Tuesday View Post
Just remember, there won't be any pool noodles at competition. Unless your deployment includes them
That's a great idea, then you won't worry about having to slow down your minibot as the motors backdrive.
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Unread 11-03-2011, 21:56
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Re: Rookie Team 3729's minibot

Holy crap. No wheels but how?
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Unread 11-03-2011, 21:57
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Re: Rookie Team 3729's minibot

The video was our first pole test. We've since slowed down the decent by back driving. Even without back driving the minibot is light enough that it's decent is slow enough that it wouldn't tear up anything even without pool noodles to land on.
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Unread 11-03-2011, 22:14
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Re: Rookie Team 3729's minibot

HOW DOES IT GET UP??????????

Unless you provide a valid reason, I label this video as fixed, edited, and a lie. Give a good reason, or this will be disregarded as a photoshopped video.
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Unread 11-03-2011, 22:38
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Re: Rookie Team 3729's minibot

Each motor armature has a two inch long 3/8 diameter extension. The extensions are covered in latex tubing and drive directly on the pole. The minbot frame is 8 inch by 3 1/2 inch 1/16 thick Lexan. There are two pieces of 6 inch long 1/2 inch aluminum tubing attached to the frame that guide the minibot off the deployment tray. The only other components are two lamp switches and the Tetrix battery.
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Unread 11-03-2011, 22:44
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Re: Rookie Team 3729's minibot

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Originally Posted by NOV8R View Post
Each motor armature has a two inch long 3/8 diameter extension. The extensions are covered in latex tubing and drive directly on the pole. The minbot frame is 8 inch by 3 1/2 inch 1/16 thick Lexan. There are two pieces of 6 inch long 1/2 inch aluminum tubing attached to the frame that guide the minibot off the deployment tray. The only other components are two lamp switches and the Tetrix battery.
Ahhh! I didn't see the 720p option. I thought I saw an extension type thing on the motors! Bravo to your design. We had something like that in mind but slightly different. Again grats!
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Unread 11-03-2011, 23:07
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Re: Rookie Team 3729's minibot

That's exactly what our minibot looks like and how it works.

If you are a good team, you will copy this robot.
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Unread 11-03-2011, 23:46
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Re: Rookie Team 3729's minibot

We tried direct driving off the motor a 3/16 shaft with sergical tubing over it and it smoked the motor. I would like to see a close up.
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Unread 12-03-2011, 00:54
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Re: Rookie Team 3729's minibot




Ask and ye shall receive
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Unread 12-03-2011, 06:56
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Re: Rookie Team 3729's minibot

Quote:
Originally Posted by joeweber View Post
We tried direct driving off the motor a 3/16 shaft with sergical tubing over it and it smoked the motor. I would like to see a close up.
How much did your smoking robot weigh? In our attempts, direct drive would not bugle our 4.25 lb minibot. With a 2.25 lb minibot, direct drive works amazingly well.

The other parameter is the right amount of normal force on the pole- for a 2 lb robot, you want about 4 lbs of normal force to hold the surgical tubing of the wheels to the pole. Too much and the motors are loaded down by friction.
Vamfun did nice simulations...
http://www.chiefdelphi.com/forums/sh...6&postcount=16

Last edited by boomergeek : 12-03-2011 at 07:08.
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Unread 12-03-2011, 07:53
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Re: Rookie Team 3729's minibot

Quote:
Originally Posted by boomergeek View Post
How much did your smoking robot weigh? In our attempts, direct drive would not bugle our 4.25 lb minibot. With a 2.25 lb minibot, direct drive works amazingly well.

The other parameter is the right amount of normal force on the pole- for a 2 lb robot, you want about 4 lbs of normal force to hold the surgical tubing of the wheels to the pole. Too much and the motors are loaded down by friction.
Vamfun did nice simulations...
http://www.chiefdelphi.com/forums/sh...6&postcount=16
I do not know the weight but we just had two motors, the battery and a very small frame of flate aluminum with most drilled out with holes to make it light. With out the battery it zipped right up.
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Unread 12-03-2011, 08:56
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Re: Rookie Team 3729's minibot

This is not new news guys. Many teams have competed in Week 1 with the same thing. It's good that a rookie caught on though. It's upsetting because by champs most teams will have the same minibot. More importantly, how much does it weigh?

Also, good luck finding a good deployment. It seems like only 4 out of 40 teams with the same mini have been able to deploy it.
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Last edited by rcmolloy : 12-03-2011 at 09:03.
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Unread 12-03-2011, 09:38
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Re: Rookie Team 3729's minibot

Robert is right, not new news. Even though 3729 is a rookie team, it doesn't lack horsepower. It's main mentor (me) has five years FIRST experience and has mentored teams to a regional win and two trips to Atlanta. The other mentors are engineers in aerospace. The students are very sharp and were very trainable to the ways of FIRST. They learned so fast that they helped two other FIRST teams with design. One other thing, it doesn't hurt to have a full fledged CNC machine shop as a major sponsor.
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Unread 15-03-2011, 01:37
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Re: Rookie Team 3729's minibot

Our team as prototyped a similar design, but can't seem to get the minibot to raise off the ground.

We used surgical tubing to cover 1/2 OD rods, but when it is turned on, all that happens are spinning shafts going nowhere...
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Unread 22-03-2011, 11:41
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Re: Rookie Team 3729's minibot

Is their any possible why to attach the minibot with 2 motors with surgerical tubing? and make it light as possible.... My team is having troubles finding a way to attach the minibot so I was wondering if you guys can help.
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