Saturday, March 17, 2018

Root 3 CNC - Z-Axis Back Panel

Relevant official documentation can be found at: https://rootcnc.com/machines/root-3/animated-assembly

The parts used to assemble the X-Axis Carriage Belt Idler:

  • 1x 3D Printed Part
  • 6x 608zz skate bearings
  • 2x Dowel Pins, 5/16" Diameter, 1-3/8" Long


For my first iteration of this part I tried to use M8 dowel pins, and it was an unmitigated disaster.  The pins were so tight that a hammer was needed to get the bearings onto the pin, and I always destroyed at least one of the bearings during the process.  After some advice was given online, I retried the build using 5/16" diameter pins, which worked perfectly (no hammer required).  The finished idler is seen below.


The next step was to add the top motor mount to the panel using:

  • 1x 3D Printed Part
  • 5x M3 x 25mm screws (0.5mm threads)
  • 1x M3 x 20mm screw (0.5mm threads)
  • 6x M3 washers
  • 4x M3 nylon lock nuts
  • 2x M3 nuts



Loctite Thread Locker (Blue 242) was used on the captive nuts  (where using nylon lock nuts was not possible) to help keep the screws from coming loose:



To add the lower motor mount and idler to the panel, the following parts were used:

  • 1x Idler Assembly
  • 1x 3D Printed Part (motor mount)
  • 5x M3 x 30mm screws (0.5mm threads)
  • 1x M3 x 25mm screws (0.5mm threads)
  • 6x M3 washers
  • 4x M3 nylon lock nuts
  • 2x M3 nuts




The assembled piece can be seen below:




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