over a cross dowel hole on the face of the brace as shown
in Figure 10.
A 1/2” bolt can be placed into the hole to help secure
the jig to the brace as shown in Figure 11. A 1/8” drill bit
is then used to drill a pilot hole into the edge. Once the
pilot is drilled, remove the jig and use a 5/16” drill bit to
enlarge the hole. When drilling the access holes, make sure
you drill them past the cross dowel hole in the face. This is
done to give you some space for the bolt as it exits the
The four cleats are provided to mount a shelf. This will
allow you to place some of the electronics inside the frame.
While the cleats can be made from particle board or other
engineered material, I recommend a quality plywood like
Baltic birch. A solid wood like pine will also work well. The
shelf will be attached to the cleats with wood screws later
in this project.
The cleats are secured to the frame using the following
• 12 — #6-32 x 2” machine screws
• 12 — #6-32 hex nuts
• 12 — #6 lock washers
• 12 — #6 flat washers
Figures 12 and 13 show how the cleat is attached to
the frame. Even if you don’t plan on adding a shelf to
mount some of your electronics, I still recommend installing
the cleats. It is much easier to add them now than it is later
after the Y axis has been installed.
This completes the KReduCNC frame assembly. If you
are building along with me, your machine should look like
the one shown in Figure 14.
Next month, we will complete the Y carriage. I will
mark and cut the Y carriage plate and install the linear
bearings shown in Figure 15. SV
SERVO 04.2016 25
Figure 12 Figure 13