Society of Robots - Robot Forum

Mechanics and Construction => Mechanics and Construction => Topic started by: sonictj on November 08, 2008, 05:13:39 PM

Title: need help finding motors
Post by: sonictj on November 08, 2008, 05:13:39 PM

I've been looking at all the sources I know of to find motors, but I have not found anything yet that really fits the bill.

I am looking for motors that are 12v ~150rpm and 90+ oz in rated torque at a reasonable price.  Less than $100 preferably below $50
encoders or backshaft is also a plus.

I am just wondering if anyone is using or knows where to get motors that would fit those specs (they don't have to be new either). 

*Note I have looked over the links in the parts list already.
 
As a side question:

If I wanted to encode a motor that does not have backshaft, how could I go about doing so?

Oh, and just in case you are curious the motors are for an IEEE Hardware recycling robot competition.

http://hardware.gt-ieee.org/southeastcon2009/SoutheastCon-2009-Hardware-Rules.pdf

Thanks

Title: Re: need help finding motors
Post by: sdavis6736 on November 08, 2008, 05:33:20 PM

For the motors, look at alliedelec.com they have good motors at a reasonable price.  I suggest looking at the ones put out by Globe Motors.  As for mounting an encoder to a motor without a back shaft, look at US Digital.  They have a small encoder (E4P) for about 20 bucks.  If the motor shaft is long enough this encoder will mount between the motor and the pulley or gear you put on the motor.  If not, the way I did it, is that my motor shaft did not go all the way through the pulley, so I put a coupling inside the rest of the pulley and bought an aluminum shaft (that fit the coupling), cut it to size and put it through the other side of the pulley (basically extending the motor shaft) and mounted the encoder on the end of it.