Stopping the Z Axis Drop with heavy spindles

The Elite series included a more “aggressive” thread pitch in the ball screw assembly, which when coupled with a heavier spindle in lieu of the Makita milling motor, has resulted in the Z axis dropping uncommanded when power is lost to the Z axis. This drop can happen when the Emergency Stop is pressed, or when power to the system is interrupted.

I have designed and tested over 4 weeks of use, and several versions of mounts, spring values, and design improvements to offer the solution called the Zee Keeper.

The Zee Keeper is available at The kit attaches to the 80mm motor clamp bolts with the top attaching to the “Suck It” dust boot attach slides on the left side of all Z16 or Z20 assemblies. It comes with all fasteners and hardware provided and can be installed in about 30 minutes. It only requires a 4mm hex wrench and a 6mm combination wrench (5/16").


Thats a good solution. One other option would be to install a digital brake, this one is for 3D printers but might do the job: Z Motor Brake -

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Hey Jim,

you could post the direct link so forum visitors don’t need to search the store: