The Z axis mounts on the Y axis, similarly to the way the Y gantry mounts on the X Gantry. Controlled by the same motor setup, it works in similar ways. This axis, the final one, gave me the most trouble, as the weight of the rotary tool put a lot more pressure on the motor. Note the change in coupling materials- i went through the familiar re-design process moving to machined aluminum, which worked much better.
To keep the Dremel mount plate from moving, i have it secured with two rollers, which stay rotation on either side. They run in C Channel grooves along each side of the mount plate.
Here is a detail of the Z axis system. Here you see for the first time the captive screw method I use for the majority of the machine- U-bolts made of spring steel, with a mounting hole drilled into one side. They have slightly more wobble than a regular captive nut, but have much more freedom, which works well with the imperfections in the threaded rod I bought!
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