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How can I connect a 4mm or 6mm stepper motor D shaft to an old Technic gear?

I would like to mount an old 8-tooth gear to a 4-6 mm diameter stepper motor shaft.

Lego part: 3647:

3647

Stepper motor:

Electric motor

Potential solution: from 3d printing stackexchange: https://3dprinting.stackexchange.com/questions/19522/stepper-motor-d-shaft-to-lego-axle-adapter

2 Answers 2

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I did find this pattern for a 3-D printer.

https://www.cgtrader.com/free-3d-print-models/hobby-diy/mechanical-parts/6mm-dshaft-to-lego-axis-adapter

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For 6 mm shaft the hole used to accept LEGO Technic axle is slightly less in diameter than 6 mm. So you may try modifying one end of of Technic connectors (some examples below) to fit the motor shaft and use usual Technic axle on the other end of connector.

6538c - Technic, Axle Connector 2L (Smooth with x Hole + Orientation)

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6538b - Technic, Axle Connector 2L (Ridged with x Hole x Orientation)

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