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This is a superb motor & gearbox combination, and for only $30 it's one of the best deals I've ever seen from A.E. I agree with the previous reviewer, each of these must have cost several hundred dollars originally. The motor (CAT# DCM-459) is a true professional-quality product for serious industrial and scientific applications. The gearbox is of equal quality, very quiet, heavy-duty internals, flawless machining. ABSOLUTELY NO BACKLASH! Take it from an engineer -- that's hard to do.
This thing has incredible torque! Out of curiosity, I put a long 10mm wrench on the shaft, and tried to stall the motor. No matter how hard I tried, it was no contest, and the motor only peaked @ 3.1A during this heroic arm-wrestling match. Crude, but informative. I'm now using these to power a 150 lb stair-climbing robot.
Couple notes: My gearboxes don't have the protruding dowel pins shown in the photo on either side of the output. Also, I had to try 5 different ESCs before I found one that worked with this motor. The others all had problems starting the motor from a stop. An ESC with sensor inputs (used in large R/C cars) probably would solve this issue.
I bought a bunch of the DCM-459, and use a Roboteq MLB 1660 controller for testing. This motor with gearbox runs 8 RPM on 12v, and is used here:
https://vimeo.com/15537820. The output bearing is a hefty roller bearing that will support quite a lot. Ball bearings for all others. Very nice low RPM drive for dampers, spotlights, cameras, except that you need the driver. Here is a nice board that uses the MC33033 chip set, but needs some jumpers or PIC programming for $17.67:
http://www.ebay.com/itm/BLDC-Power-3-Phase-Servo-Motor-Driver-Hall-Effect-MC33033-MC33039-PIC16F873A-/271582181158?pt=LH_DefaultDomain_0&hash=item3f3b8f3726
This must have cost many, many hundreds of dollars new
I tried 5 & 6 volt nothing happened finallly tried 12 volt and it works.
You would think a working voltage would have been given.
I looked at the battery in the video and figured it was a 12 volt battery.
Works great, I have both motors now looking forward to using them, I might even get more.
Ralph
Agree with most of the other reviews. Great gear motor! I measured three motors for backlash. It is not exactly the right method but by turning the output shaft, using a long lever I was able to see ~3.1 degrees of free movement in the output shaft without turning the motor. I was not forcing it very hard to see this. So, there is some backlash in this gear train but still a very very good assembly.