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Description
Voltage: 5vdc
RPM: 38
Torque: 50oz.in (3.6 kg-cm)
Current: 52mA
Speed: 360 degrees/1.6 sec
Reduction: 224:1
Shaft length: 7mm double-flat (both sides)
Size: 70x22.5x37 mm
Weight: 37grams (1.31oz)
These GM3 - Gear Motor 3 - 90 degree Shaft are very comparable to a hobby servo for power, at a fraction of the cost! Fit perfectly with GMPW and GMW plastic wheels.
This gear motor rotate 360 degrees every 1.6 seconds (just a hair slower than a servo), at 5V, drawing 600mA at stall (free running at 52mA). With a 7mm double-flat output shaft (avoid using the "D" output - it's not meant to take rotational load), and a built-in clutch (limiting at 60 in.oz, but easily "locked"), and built-in mounting screw holes, you can see why we like these motors!
Based on the original design by Mark Tilden for use in the B.I.O.-Bugs (GM3 are now used for use in the Robosapien), these motors are the next generation with a variety of improvements such as dual output shafts and a lower current motor.
GM3 - Gear Motors are compatible with the Solarbotics Wheel Watcher Rotation Encoder. Use it if you need to control a robot for dead reckoning, tracking odometry (distance traveled), stalled motor, or closing the feedback loop for position/velocity/acceleration.
Motor, gears and shaft work well, recommend buying recommended wheel attachments together to ensure fit. Warning: Electrical leads are extremely delicate and will not survive more than one or two solder attempts. Ensure wires are secured after connections made, as this is how our electrical leads tore off due to wire movement.
d
dtanner3593
good
This was my first puchase online from the RobotShop, but it will most certainly not be my last. The motor I purchased shipped the same day and arrived 2 days later! Plus, it was exactly as advertised and works like a charm. Thanks RobotShop --- keep up the great work!!
R
Robert J
Good Quality for the Price, but Difficult to Work With
Nice little motor. In fact all of the GM series motors are great - as long as you don't need to connect motor shaft to anything "off the shelf", i.e. gears, pulleys, couplings, shafts, wheels ... well pretty well anything for that matter. Problem is these guys have a 7mm dual flat shaft. Solarbotics has a GMW wheel that will connect, but unless you're willing to build something that connects to the GMW, you are pretty well euchred. You could make a shaft adapter on a 3D printer - if you have one - but this would be unsuitable for a commercial quality product. The only way I have been able to connect the shaft, is by turning a shaft coupling, drilling a 6mm axial hole, reaming it out to 7mm, and then using two set screws, 180 degrees apart to locate on the flats. But this is a lot of work - might as well pay a few $$$ extra and buy a motor with a round shaft. Otherwise excellent quality, but solder lugs break easily rendering motor as scrap.
A
AC3
Excellent but...
Bought this as a replacement for the 90 degree yellow motors I have on a robot, based on the advice offered in this forum pots: https://www.robotshop.com/community/forum/t/moving-from-cheap-yellow-motors-to-low-cost-dc-gear-motors/25901. The advice looked genuine to me and appeared to be authoritative (as if from someone working for Robot Shop). When the new motors arrived they did indeed fit into exactly the same mountings as my previous yellow motors but the drive shaft is a completely different size, meaning new wheels and tyres. Now I've done that they do a good job but, they are not a direct replacement.
D
David
Great motor
This is a well made good quality motor highly recommended
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Build-it-yourself Robot Parts are not refundable once assembled. Robots & Kits requiring assembly or soldering are also not refundable once assembled, soldered or modified in any way. All sales of robotic software and apps are final and cannot be refunded or exchanged. Returns are not accepted on special orders and clearance items except when they are found defective, in which case the Product may be repaired or replaced at the Vendor’s discretion. 20% Restocking fees may apply if you are returning a large quantity of the same Product that was ordered specifically for you from the manufacturer.
Please note that all items will be reimbursed within 7 to 14 days of receiving the Product (shipping fees excluded). You must also cover the cost of returning the Product. Shipping fees will only be refunded if the return is a result of a shipping error on our part. Cleaning fees of USD 100 may also be charged if a domestic robot is returned and has not been properly cleaned.
