The micro plastic gearmotor’s output shaft is compatible with our 14 mm wheels. We don’t have any Micro Planetary Gear Motor brackets for this gearmotor, and it generally does not have any installation holes, but its small size makes it simple to fasten with tape or glue. Alternatively, since this gearmotor is nearly the same size as a 1/4″ fuse, it could be mounted using regular 1/4″ (6 mm) fuse clips.
The next diagram shows the micro plastic gearmotor dimensions in mm. The planetary gearbox has a D-shaped plastic output shaft, which is 2 mm in diameter with a section that’s flattened by 0.5 mm. The “D” part of the shaft can be 2.5 mm long. The engine steps 6 mm in diameter and 9 mm in length, and the gearbox length, labeled “L” in the diagram below, depends on the gear ratio. The 26:1 gearbox is certainly 7.1 mm long, while the 136:1 option actions 9.4 mm. The motor leads include their tips pre-stripped and extend approximately 2 cm (0.8″) from the back of the motor.
Since the gearmotor’s output shaft is nylon, there may be small variances in the diameter from unit to unit. These variations might cause press-fit attachments like our 14 mm wheel to match loosely in some instances. If you experience a loose fit, you could try swapping tires or using a little dab of glue to help hold the wheel on.