Small Reduction
Stepper Motor 12VDC 32-Step
1/16 Gearing
Product ID: 918
Description
This is a great first stepper motor, good for small projects and experimenting with steppers. This
uni-polar motor has a built in mounting plate with two mounting holes. There are only 32 step
(11.25 degree) per revolution, and inside is a 1/16 reduction gear set. (Actually its 1/16.128 but
for most purposes 1/16 is a good enough approximation) What this means is that there are really
32*16.128 steps per revolution = 516.096 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 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 - we maxed out
at about 20 RPM when powering with 12VDC and about 12 RPM on 9VDC.
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 Adafruit_StepperMotor *myMotor =
AFMS.getStepper(516 ,motornum) and the speed at 5 RPM by calling motor->setSpeed(5).
Otherwise, you can also wire it up with some transistors and use the Arduino Stepper library
Technical Details
Revision History:
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As of Jan 2021, these have been coming with 1/64 gearing rather than 1/16 gearing!
As of Nov 2021, we now have them back with 1/16 gearing as we prefer!
Specifications:
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Unipolar stepper with 0.1" spaced 5-pin cable connector
2052 steps per revolution
1/16.128 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: 62 gram-force*cm, 6 N*mm, 1 oz-force*in
Shaft: 5mm diameter flattened
https://www.adafruit.com/product/918_3-1-22
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