View unanswered posts | View active topics It is currently Fri Aug 01, 2014 6:13 am






Reply to topic  [ 5 posts ] 
End of Tele-Op Problem 
Author Message
Rookie

Joined: Mon Dec 19, 2011 5:06 pm
Posts: 2
Post End of Tele-Op Problem
We have an arm with a clamp on it to grab and lift up baskets. The problem we are having is at the end of Tele-Op the servos remain under some power for just a little bit but eventually completely relax. When this happens our clamp relaxes and drops our basket. Is there anything we can put into our code that would keep the servos in position at the end of the Tele-Op period?


Wed Jan 25, 2012 10:49 am
Profile
Guru
User avatar

Joined: Sun Nov 15, 2009 5:46 am
Posts: 1347
Post Re: End of Tele-Op Problem
No, when TeleOp ends, power to the servo is cut, so it will go limb. Our team has the same problem. We wish we had thought about it before and we would have designed it differently.


Wed Jan 25, 2012 3:34 pm
Profile
Moderator
Moderator
User avatar

Joined: Tue Sep 14, 2010 9:19 pm
Posts: 496
Post Re: End of Tele-Op Problem
In our case, the problem was solvable by putting a weak elastic across our actuator. The hard part is finding the right strength of elastic: weak enough so the servo is not constantly struggling too much, and strong enough to hold the parts together when the servo is shut off. Another solution is to gear the servo, or put some friction on it, so that it holds in position when power is cut.

_________________
sudo rm -rf /


Wed Jan 25, 2012 4:54 pm
Profile
Guru
User avatar

Joined: Sun Nov 15, 2009 5:46 am
Posts: 1347
Post Re: End of Tele-Op Problem
magicode wrote:
In our case, the problem was solvable by putting a weak elastic across our actuator. The hard part is finding the right strength of elastic: weak enough so the servo is not constantly struggling too much, and strong enough to hold the parts together when the servo is shut off. Another solution is to gear the servo, or put some friction on it, so that it holds in position when power is cut.

Yes, you really have to make sure the servo doesn't struggle too much. We fried a couple servos this season because of too much friction.


Wed Jan 25, 2012 5:07 pm
Profile
Moderator
Moderator
User avatar

Joined: Tue Sep 14, 2010 9:19 pm
Posts: 496
Post Re: End of Tele-Op Problem
In later years, whenever a servo was needed, we geared up a continuous rotation servo and installed a potentiometer.

_________________
sudo rm -rf /


Wed Jan 25, 2012 6:37 pm
Profile
Display posts from previous:  Sort by  
Reply to topic   [ 5 posts ] 

Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  



Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group.
Designed by ST Software for PTF.