Root 3 CNC - Box Carriages

The first parts built were the box carriages.  A number of these are needed for the machine (4 total).  Relevant official documentation can be found at:

https://rootcnc.com/machines/root-3/animated-assembly

• Box Section Carriage Prep
• Box Section Carriages

For each half of the box carriage, I used the following:

• 1x 3D Printed Part
• 4x M8 x 25mm bolts (1.25mm threads)
• 4x 608zz type bearings
• 4x M8 nylon lock nuts
• 8x M8 washers

Push the bolts through and add washers:

Add skate bearings:

Add another washer and a nylon lock nut:

Lather rinse repeat 8 times.

To assemble two halves into one full carriage, I used the following:

• 2x box section subassemblies (from above)
• 4x M8 x 75mm bolt (1.25mm threads)
• 8x M8 nuts
• 8x M8 lock washers
• 4x M8 nylon lock nuts
• 6061 Aluminum Rectangular Tube 1/8" Wall Thickness, 1" High x 1" Wide
• length of tube will be specific to how large you are making your cnc router

Insert the bolts, and cover with a lock washer and standard nut (tighten):

Set the aluminum box tube in place, then add a standard nut and lock washer:

Add the other box section half assembly, then top with lock nuts:

Tightening the middle and top nuts took some trial-and-error.  I used ABS for the 3D printed parts, so some of the larger parts are slightly skewed/warped, so tightening was done a little at a time until all bearings were in contact with the box tube and spinning freely.  When complete, the assembly should travel freely on the box tube, and the tube should be able to be removed/re-inserted without too much hassle.