Modelling a Pocket Design for Nuts and Screws

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When we 3D modeled and printed the gears we used, we had to take into account the gear may slip off its axle (either the stepper motor rod or the aluminum rod we used). To make sure that this did not occur, a nut and screw need to be attached to the gear, and the screw needs to come into contact with the axle to assure the gear will turn with its axle. One common way to do this is to make an extruded cut into the base of the gear. The cut should be in the shape of the nut being used. An additional circular extruded cut needs to be added for the screw to thread into. An example of an extruded cut is shown below:

12tgear wextrudedcut.jpg