CNC3018 spindle mount

The original spindle holder was introducing a lot of runout and wobbling. My goal was to use this CNC3018 for PCB milling and I needed a decent precision for it so I decided to redesign the spindle holder and Z-axis sledge.

Before you print
Check your CNC3018-like machine if it fits this design. I know there
are many variations of this machine with LMUU10 bearings on Z-axis instead LMUU08 and different bearings spacing. In this project the spacing between linear bearings center is 38mm which kinda explains why the trapeizodal screw has to be cut in order to fit in between.


Required items:

- 2x LM08LUU linear bearings (45mm long)
- 1x Trapezoidal screw TR8x4 (check with your machine) with anti-backlash nut (needs to be cut and grinded to fit inside the Z-axis sledge)
- 3x Hex M6 screw, nut and washer
- AC glue

You need to fix the trapezoidal screw with the spring and antibacklash-nut inside the sledge. Then check it with the trapeizodal rod if it fits properly, mecha