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-   -   under 2 sec Mini bot (http://www.chiefdelphi.com/forums/showthread.php?t=90545)

nuggetsyl 30-01-2011 18:02

under 2 sec Mini bot
 
I am starting to think is possible to get a mini bot up in under 2 secs.

thefro526 30-01-2011 18:04

Re: under 2 sec Mini bot
 
I think it's been proven that a mini-bot can climb the pole in less than two seconds.

I wonder how many people can figure out how to do it?

BJC 30-01-2011 18:07

Re: under 2 sec Mini bot
 
Today while at work I was doing some math on my phone and I got the theoretical time very nearly below 1 second.

itsalka 30-01-2011 18:08

Re: under 2 sec Mini bot
 
How are you getting your minibots to do that?
So far we've gotten the bot up in 10 seconds, but we're running into difficulties for making it go faster with our tetrix wheel (not the best traction), and messing around with the gear ratios, and just finding where to distribute weight.
What kinds of designs are you guys using?

Chris27 30-01-2011 18:09

Re: under 2 sec Mini bot
 
Yes.

Proof by example

http://www.chiefdelphi.com/forums/sh...ad.php?t=90114

Q.E.D.

(unless you are including the start of deployment as well?)

BJC 30-01-2011 18:24

Re: under 2 sec Mini bot
 
Quote:

Originally Posted by itsalka (Post 1011919)
How are you getting your minibots to do that?
So far we've gotten the bot up in 10 seconds, but we're running into difficulties for making it go faster with our tetrix wheel (not the best traction), and messing around with the gear ratios, and just finding where to distribute weight.
What kinds of designs are you guys using?

I won't tell you exactly how. But, concerning weight distribution ideally your weight is pushing your drive wheel(s) into the pole, concerning gear ratios find the top of the power curve and eliminate extra gearing as each stage adds inefficiency, concerning tetrix wheel traction slit some surgical tubing down the middle and put it around the wheel with PVC glue to secure it (just an idea, haven’t tried it).

Good Luck

Tom Line 30-01-2011 18:29

Re: under 2 sec Mini bot
 
It's all in the design.

1. Minimize weight.
2. Increase efficiency (eliminate gears)
3. Maximize power through gear ratio and wheel size choice.
4. Profit!

There are also some other games you can play to increase the power of the system (legally).

foozie 30-01-2011 20:09

Re: under 2 sec Mini bot
 
Quote:

Originally Posted by Chris27 (Post 1011920)
Yes.

Proof by example

http://www.chiefdelphi.com/forums/sh...ad.php?t=90114

Q.E.D.

(unless you are including the start of deployment as well?)

Remember that that video is without a battery. Is there any minibot who has actually climbed the 8 ft with a battery in less than 2 seconds?

Swampdude 30-01-2011 20:11

Re: under 2 sec Mini bot
 
Those of us who can/have done it ;) aren't likely to show anything until competition, otherwise everyone will be doing it. Even then keeping them covered in the pit might be common. It's so easy to reconfigure these tetrix kits.

Garten Haeska 30-01-2011 20:21

Re: under 2 sec Mini bot
 
my mini bot goes up in 4-5 seconds and it only has one set of wheels powered and i plan to put it on both sets

Alpha Beta 30-01-2011 20:21

Re: under 2 sec Mini bot
 
Quote:

Originally Posted by Swampdude (Post 1011995)
Those of us who can/have done it ;) aren't likely to show anything until competition, otherwise everyone will be doing it. Even then keeping them covered in the pit might be common. It's so easy to reconfigure these tetrix kits.

I agree. Has anyone considered having a 3 second bot for Thursday and Friday, and saving the sub-2 second bot for Saturday as a secret weapon?

Cyberphil 30-01-2011 20:25

Re: under 2 sec Mini bot
 
Quote:

Originally Posted by Alpha Beta (Post 1012012)
I agree. Has anyone considered having a 3 second bot for Thursday and Friday, and saving the sub-2 second bot for Saturday as a secret weapon?

That is interesting. But even then, if it uses the same tetrix parts, and if another team has the parts needed, I think they could create it over lunch or something. I think it is a good idea to keep your design concealed, but you can keep it concealed even when you are using it in competition.

MagiChau 30-01-2011 20:25

Re: under 2 sec Mini bot
 
Quote:

Originally Posted by Alpha Beta (Post 1012012)
I agree. Has anyone considered having a 3 second bot for Thursday and Friday, and saving the sub-2 second bot for Saturday as a secret weapon?

I would say this is a bad plan since you are doing an unnecessary limit. Do not purposely weaken your team's capability to effectively complete the challenge. Do your best at qualifications so you can use the "secret weapon" during eliminations.

EDIT: after reading Cyperphil's post, if you want to really hide then cover the minibot with polycarbonate since its allowed.

davidthefat 30-01-2011 20:26

Re: under 2 sec Mini bot
 
Wait a minute here... So teams have already build (or at least prototyped) their minibots already? Our team only has the CAD and a prototype made with servos. We are behind.

edit: our design is so crazy that I doubt that any team can fabricate the deployment system and the minibot in the 2 day period.

MagiChau 30-01-2011 20:29

Re: under 2 sec Mini bot
 
Quote:

Originally Posted by davidthefat (Post 1012017)
Wait a minute here... So teams have already build (or at least prototyped) their minibots already? Our team only has the CAD and a prototype made with servos. We are behind.

My team started prototyping the day we got the FTC kit. We went through I think at least 4-5 different prototypes already. Forgot if our current minibot is going to be final design.


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