to all you guys who have played a LOT with these motors..
 

Posted by Anton Abaya at 1/20/2001 1:12 AM EST


Coach on team #419, Rambots, from UMass Boston / BC High and NONE AT THE MOMENT! :(.



we're thinking of doing some tinkering with these motors ourselves but were wondering what other teams have played with...

question 1: what is the MAXIMUM speed you think you can attain with these motors with a robot weight of ~130lbs? in ft/sec....given the proper gear ratios and CONTINUOUSLY without heating up the circuit breakers?

question 2: is there anything wrong with running the motors at a high gear and at a gear ratio that will output say 14ft/sec, but limiting the maximum speed at 10ft/sec via software?

question 3: anyone have experience with running these 1:1 at high gear or low gear?

question 4: we want to test our output amperage from that go through our wires especially the ones from our motors, compressor, etc. Someone recommended purchasing an ampmeter that would support a high amperage. Anyone have any ideas where we can purchase one? The CHEAPER the better.

thanks guys...

-anton

ps. it's really hard to make a robot with an extremely small budget with barely any experience, but forums like these and the advice i've gotten has made that possible..thanks guys.

Re: to all you guys who have played a LOT with these motors.
 

Posted by Matt Leese at 1/20/2001 4:58 PM EST


Other on team #73, Tigerbolt, from Edison Technical HS and Alstom & Rochester Institute of Technology.


In Reply to: to all you guys who have played a LOT with these motors..
Posted by Anton Abaya on 1/20/2001 1:12 AM EST:



: we're thinking of doing some tinkering with these
motors ourselves but were wondering what other teams
have played with...

: question 1: what is the MAXIMUM speed you think you
can attain with these motors with a robot weight of
~130lbs? in ft/sec....given the proper gear ratios and
CONTINUOUSLY without heating up the circuit breakers?

I'm not going to guess but it's mostly a factor of the
static and kinetic friction provided from the wheels to
the carpet. You'd be gearing up from high speed to get
there and that's just a bad idea.

: question 2: is there anything wrong with running the
motors at a high gear and at a gear ratio that will
output say 14ft/sec, but limiting the maximum speed at
10ft/sec via software?

Well, you lose torque that way. It's more efficient to
just gear down the motor and create more torque that way.

: question 3: anyone have experience with running
these 1:1 at high gear or low gear?

Yes, it's a bad idea. You get a fast robot but it's
rather hard to control and it does nasty things to the
drill motors themselves (killed two of them that way).
It also provides a robot with very little torque

: question 4: we want to test our output amperage from
that go through our wires especially the ones from our
motors, compressor, etc. Someone recommended
purchasing an ampmeter that would support a high
amperage. Anyone have any ideas where we can purchase
one? The CHEAPER the better.

You can buy an ampmeter at Sear's for one. You may
just want to buy a multimeter that can read other
things such as resistance and voltage. Just make sure
that it supports DC circuits. You may want a clamp on
multimeter in order to read the values more easily. I
know Sear's sells a clamp on multimeter for about $100.

Matt