Re: Minibot Time Showcase
 

Indeed... Some people have been quite... exhuberantly misleading when it comes to minibot times...

(I won't mention any names, but one of these people has the initials "Jason Rees"...) :p

Re: Minibot Time Showcase
 

I did not think those times were possible until we hit a breakthrough last night. Now I am sure 1.6-1.7 is possible to do reliably. :)

Re: Minibot Time Showcase
 

Whoops.

Re: Minibot Time Showcase
 

team 3467
first minibot goes up in 2.6 seconds
http://www.youtube.com/user/frc3467?feature=mhum
we also are making anther one that we estimate for it to go up in 2.2 seconds
god way to start our first rookie year

Re: Minibot Time Showcase
 

We are arround 6.5 sec complete-- You can view here
http://www.facebook.com/pages/Team-2...2532332?ref=nf
Unit is about 7 LBS and has quite a bit of friction but after 4 weeks of protos that didn't work, we are happy

Re: Minibot Time Showcase
 

Oh, I'm sure of it, too. We have about 1.8 seconds reliably. I was just picking on Mr. Rees. :D

Re: Minibot Time Showcase
 

Nice job. I have talked to a whole bunch of "3 second" teams that still can't deploy there mini and hope to figure it out later...

At a minimum it is worth 10-15 points. If it works every time, I would wager this will get you picked up for eliminations and thus well worth the effort.

Re: Minibot Time Showcase
 

That is so true! We had a fast bot but it took quite some effort to get it onto the pole!

Re: Minibot Time Showcase
 

Team 241 had a breakthrough on minibot design # 5.

Design #1 - tank= The All Tetrix Aluminum, nuts and bolts - direct drive 4" wheels on Tetrix gearbox and motors. Mousetrap action to connect to pole.

Weight 4.4# Time 4.5-5 sec
Reliability - 10/10 trials
Deployment 0.5 seconds - self-aligning to pole prior to End Game.

Design #2 - add 2:1 external gearing to design #1 - mostly built but not tested. Stopped work when Richard published his dynamometer results of Tetrix motors with and without gearboxes.
http://www.chiefdelphi.com/forums/sh...ad.php?t=89072

Design #3 - direct drive motors w/o gearboxes with motors with 3/16" shaft covered in thin surgical tubing running on the inside rim of the 4" wheels.
Weight 4.5# Time - fail - the motors would slip on the inside of the rims.

Design #4 - "the crossbow" - direct drive motors w/o gearboxes with motors with 3/16" shaft covered in thin surgical tubing running on the inside rim of the 4" wheels. Inside rim covered with rubber band material to provide extra grip.

Weight 3.3# Time 7 seconds - too much friction on rubberband to surgical tubing contact. Very disappointing.

Design #5 - midget - direct drive to 3/8" wheels, Mousetrap action to connect to pole. Uses bare motors, battery, nylon standoffs, OFF switch and 3 or 4 nuts and bolts from the Tetrix kit.
Weight 2.1# !!! Time ~2 seconds
(still need to adjust deployment to allow either the midget or the tank and mount the turnoff switch) may add another 0.1 lbs.
Reliability - not known yet

No magnets.

Re: Minibot Time Showcase
 

http://www.chiefdelphi.com/forums/sh...ibot+time+poll

Repeat thread...

Re: Minibot Time Showcase
 

In case you can't read a date, this was first, by far

Re: Minibot Time Showcase
 

Well, This is the culmination of six hours of work. Our team didn't take the minibot seriously, so when the minibot team failed to produce in 6 weeks, I took it upon myself to fix it. When calculated, from the base of our deployment to the top, it will take a little over 4 seconds. Sorry about the video, I almost broke the robot. :ahh: It uses direct drive to two 3" wheels. The wiring has been planned for deployment, but has not been fixed yet.

Re: Minibot Time Showcase
 

Pretty great weight. We have a similar super minibot that uses magnets and we are sitting at about 2.5 lbs.
How are you protecting the motors from smoking in case of a misfire? And how many motors have you gone thru?
We have inadvertently smoked 3 motors early on and since have been more careful.

Re: Minibot Time Showcase
 

We have ruined the same amount :D