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Subject: 
Expected battery life
Newsgroups: 
lugnet.robotics
Date: 
Wed, 12 Jan 2000 13:32:49 GMT
Original-From: 
Skye Sweeney <SSWEENEY@SANDERS.spamcakeCOM>
Reply-To: 
ssweeney@sanders.com <SSWEENEY@SANDERS.saynotospamCOM>
Viewed: 
562 times
  
Activate de-lurk and engage.....

I got a RIS recently and am having great fun with it. I am working
with the tank tread robot from the manual trying out the line
following challenge.

What I find is that the bot will move nicely forward and bog down in
turns. One motor will appear to stall. I have looked for any place
the parts may be binding and have found none. I am wondering
if this is just weak batteries. They are down to 7.8V.

How long do you normally get from a fresh set of good quality batteries?

Also, in building a simple two wheel and castor bot as per the instructions,
the robot does not travel in a straight line as the instructions say it
will. Is it possible that I have a bad motor?


-Skye Sweeney
(603) 885 7744

"God has nothing to do with Air Traffic Control. He is still mad we learned to fly."
-Glenn Eaton



Message has 4 Replies:
  Re: Expected battery life
 
(...) have you tried upping the output power on the motor by 1 on the turn (...) i don't think long. The Baum book highly recommends getting rechargeables. (...) maybe, but probably not. i found the same problem. Again, Baum's book (somewhere) (...) (25 years ago, 12-Jan-00, to lugnet.robotics)
  Re: Expected battery life / motor differences
 
(...) If you're talking about the tank treads, those scrub a lot when trying to turn in place. A line following bot would probably be easier to build with one of the alternate wheelsets (and I don't mean the little feet!). (...) Depends. If I'm just (...) (25 years ago, 12-Jan-00, to lugnet.robotics)
  Re: Expected battery life
 
(...) Remember that with the standard software, the 'stopped' motor is actually shorted out, and breaking. Treads use quite a lot of power when turning this way (the front and back are actually being scrubbed sideways, and the power for this comes (...) (25 years ago, 12-Jan-00, to lugnet.robotics)
  Re: Expected battery life
 
(...) I had a similar experience with my new Mindstorms kit, and discovered (by using the RCXCC "Direct Control" options) that, about 10% of the time, one motor failed to respond to start commands (although, if you gave the shaft a starting twist (...) (25 years ago, 13-Jan-00, to lugnet.robotics)

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