Shown in Figure 2, it has the holes for mounting the
bearing block and rods. The square holes on the bottom
are for eventually mounting plates that may contain holes
for various controls, such as an E-stop or power switch.
Even if you won’t be using these holes, I suggest you cut
them anyway for future upgrades.
The rear brace shown in Figure 3 is much like the front
brace. Instead of the bearing block, a motor will be
mounted. The holes for this are identical to the front brace.
A large slot has been cut into the bottom of the brace for
access to various connections to the CNC.
The top brace (Figure 4) is used to help stiffen the
frame. It is placed between the two sides near the top of the
CNC. This brace can also be used to anchor cables or hoses.
In addition to the frame components listed above, the
following hardware fasteners were used to hold the
• 12 — 1/4-20 cross dowels
• 12 — 1/4-20 x 2” hex bolts
• 12 — 1/4” washers
To assemble the frame, cross dowels are inserted into
the face mounting holes of the front, rear, and top braces
as shown in Figure 5. The cross dowels are designed to fit
into a 1/2” hole in the face as shown. A 1/4-20 x 2” bolt
with washer is then inserted into the face of the sides and
then into the appropriate cross dowel access hole as shown
in Figure 6.
The exploded view in Figure 7 shows each of the 12
cross dowel connection points. Once assembled and
tightened, the frame is very rigid. When assembling the
By Michael Simpson
SERVO 04.2016 23
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Figure 1 Figure 2
Figure 3 Figure 4