Rookie Team 3729's minibot
 

Two motors, no gearboxes, no wheels, Lexan frame , sub 2 sec climb

http://www.youtube.com/watch?v=MwCRfFaqFo4

Re: Rookie Team 3729's minibot
 

No motors! How does it get up then???

Re: Rookie Team 3729's minibot
 

too fast trick cam can we c a close up

Re: Rookie Team 3729's minibot
 

Just remember, there won't be any pool noodles at competition. Unless your deployment includes them :D

Re: Rookie Team 3729's minibot
 

That's a great idea, then you won't worry about having to slow down your minibot as the motors backdrive.

Re: Rookie Team 3729's minibot
 

Holy crap. No wheels but how?

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.

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.

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.

Re: Rookie Team 3729's minibot
 

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!

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.

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.

Re: Rookie Team 3729's minibot
 

Ask and ye shall receive

Re: Rookie Team 3729's minibot
 

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

Re: Rookie Team 3729's minibot
 

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.