Clamping bracket for sideway mounting of stepper motors

by enif, published

Clamping bracket for sideway mounting of stepper motors by enif Feb 25, 2017
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This project addresses the need to mount Nema14/Nema17 stepper motors on a side wall, without using the motor's four screws holes on top (or bottom). This is useful when the top of the motor is equipped with some other mechanism (such as e.g. a direct extruder). The motor assembly can be inserted and removed quickly from the mounting bracket without the need to remove the top assembly.

The position of the mounting screws is configurable, so the screws can either be hidden inside the bracket (saving space) or be accessible outside from the outside. For outside screws, normal or countersunk versions are available.

The rear wall of the bracket has a configurable cutout for the motor wires. The bracket has holes and air channels to allow better air cooling when the motor get warm.

The motor is hold securely in place by means of two M3 clamp screws at the front edges of the bracket. Two M3 screw nuts hidden in the front corners provide the corresponding mating threads. When using grub screws, the clamping mechanism remains almost invisible from the outside.

The motor brackets are printed upside down, so no supports are needed for printing.

The OpenScad source is fully parametrized and commented, so that it can easily be adapted to special needs. Predefined ready-to-print versions are provided for Nema14 and Nema17 motors, with the mounting screw variants: inside countersunk, outside countersunk and outside normal screws.

Update 2017-03-04: I have added three STL files for Nema17 which give 3mm extra width (ew) at the rear for the motor wiring. This might be needed for motors which have a wire plug that is perpendicular to the motor axis.

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This is the design I'd like to use. Kindly tell me what the two different sized Nema17 mounts mean. There is a 34mm and 54mm. What do these measurements represent? Standing them both on their "feet" in Cura, I can see that the 34mm version is taller, with the "top" portion being thinner.

Thank you.

The 34mm and 54mm are the distance between the mounting screw holes. The 34mm version has the screws "inside", so it can be mounted right at the edge of the frame. The 54mm version has the mounting screws on the outside and thus needs some extra space on both sides.

Ah, perfect. Now I see what these measurements are for. Thanks for the info.

One more question: What type of bed surface is on your printer?