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Unread 01-03-2011, 01:42
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Minibot falls slowly?
http://www.youtube.com/watch?v=N96VeZedEec

A video is worth a thousand pictures, thus worth a million words
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        self.info = {"name": "Robototes", "school": "Sammamish High School, Bellevue, WA"}
        assert self.kind_people == True
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Unread 01-03-2011, 04:00
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Re: Minibot falls slowly?
you short the motors
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Unread 02-03-2011, 17:41
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Re: Minibot falls slowly?
Quote:
Originally Posted by Robototes2412 View Post
http://www.youtube.com/watch?v=N96VeZedEec

A video is worth a thousand pictures, thus worth a million words
Care to expound? Would be appreciated.

Thanx,

David
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Unread 02-03-2011, 17:55
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Re: Minibot falls slowly?
Maybe you could put some sort of ratcheting mechanism in there. http://www.vexrobotics.com/276-1546.html might be a good option.

-vivek
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Unread 02-03-2011, 18:02
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Re: Minibot falls slowly?
Quote:
Originally Posted by vivek16 View Post
Maybe you could put some sort of ratcheting mechanism in there. http://www.vexrobotics.com/276-1546.html might be a good option.

-vivek
Thought of something like that. Didn't want to stop it hard enought to make the bot fall off the pole though (kinda would defeat the purpose ).

David
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Unread 02-03-2011, 18:32
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Re: Minibot falls slowly?
http://www.youtube.com/watch?v=a6EKw0RInRw

Our team's minibot does a very similar thing on purpose at about 1:48 in the video above.
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Unread 02-03-2011, 18:38
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Re: Minibot falls slowly?
Ours is built differently, but could you explain how you got the motors to slowly roll? Ours prefers to zoom down.

Thanx,

David
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Unread 02-03-2011, 18:42
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Re: Minibot falls slowly?
Ours also always comes down. Shorted the motors in series off the "normally open" on the limit switch.

http://www.frc272.com/2011Season/Min..._timed_run.wmv

I like this one the best. Hicups a little in the beginning before grabing. If 4.48 is a slow run for us I will take it.

David what is your gear ratio?????
Last edited by liam.larkin : 02-03-2011 at 19:02. Reason: forgot some stuff
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Unread 03-03-2011, 14:50
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Re: Minibot falls slowly?
Quote:
Originally Posted by liam.larkin View Post
Ours also always comes down. Shorted the motors in series off the "normally open" on the limit switch.

http://www.frc272.com/2011Season/Min..._timed_run.wmv

I like this one the best. Hicups a little in the beginning before grabing. If 4.48 is a slow run for us I will take it.

David what is your gear ratio?????
Am I supposed to know my gear ratio ? To be honest, I actually don't know all of that. I just built it . It uses the largest tetrix gears in the FTC mini kit, and they go to the smallest gears mounted on the wheels.

Thanx,

David
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Unread 03-03-2011, 17:18
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Re: Minibot falls slowly?
Quote:
Originally Posted by 2829ron View Post
Am I supposed to know my gear ratio ? To be honest, I actually don't know all of that. I just built it . It uses the largest tetrix gears in the FTC mini kit, and they go to the smallest gears mounted on the wheels.

Thanx,

David
Okay based on that.....I am assuming you are using either a limit switch or household light swtich to start/stop your minibot when it hits the top. Take whatever side you have left either normally open/normally closed output (depends on your design) and short that across your motors in series and you will get something similar to our result
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