MCM Electronics

12VDC 48-Step Small Reduction Stepper Motor By Adafruit Industries (918) MCM Part #28-17448

4.5 stars 1 review
MSRP: $4.95
You Save: $0.46 (9 %)
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This is a great first stepper motor, good for small projects and experimenting with steppers.

Specifications Top

This uni-polar motor has a built in mounting plate with two mounting holes. There are only 48 step (7.5 degree) per revolution, and inside is a 1/16 reduction gear set. What this means is that there are really 48*16 steps per revolution = 768 steps! The shaft is flattened so its easy to attach stuff to it with a set-screw. A perfect first stepper motor and works well with the Motor Shield for Arduino.

The gearing has a few side effects which are important to note. First, you can turn the stepper by hand but not as smoothly as an un-geared stepper. It also means you shouldn't use interleaved or micro-stepping to control or it will take forever to turn. Instead use single or double stepping. The torque is fairly high but its slower than un-geared steppers - it maxed out at about 80 RPM.

To use with the Adafruit Motor Shield, connect red to ground (middle), orange and pink to one motor port (say M1) and blue and yellow to the other motor port (say M2). So in order, thats: orange - pink - red - blue - yellow. Then just use the example code that comes with the Adafruit Motor Shield library and set the constructor to AF_Stepper motor(768, motornum) and the speed at 5 RPM by calling motor.setSpeed(5).

  • Unipolar stepper with 0.1"" spaced 5-pin cable connector
  • 48 steps per revolution
  • 1/16 geared down reduction
  • 5V-12V DC suggested operation
  • Weight: 37 g.
  • Dimensions: 28mm diameter, 20mm tall not including 9mm shaft with 5mm diameter
  • 9"" / 23 cm long cable
  • Holding Torque @ 12VDC: 250 gram-force*cm, 25 N*mm/ 3.5 oz-force*in
  • Shaft: 5mm diameter flattened
Part Numbers
MCM Part #:28-17448
Adafruit Industries Part #:918
Package Specifications & Dimensions
Weight:0.0025 lbs.
RoHS Comp:Yes
Warranty:180 days
Need to Return?
Length:5 in.
Width:2.5 in.
Height:1 in.
Shipping Information
Extra Shipping Charge:No
Drop Ship:No

Product Reviews Top

  • by stevebrown

    on 11/22/2015

    Great for hobby project and to learn with, listed specs are not right.

    Overall: 4.5 out of 5

    I was able to drive this motor using a Raspberry Pi and a ULN2803A chip. The motor actually has 32 steps per revolution, not the 48 stated in the description. Gearing results in approximately, but not exactly, 513 steps per revolution. This may be problem for certain applications. Because of the gearing, the top speed is limited, but torque is high for such a small motor.

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