CNC Build 4
CNC Build 5
The KRMx01 CNC (shown in Figure 5) is made from
steel and aluminum. It has a cutting area of 43” x 32” in
order to build larger projects. The new design of the
KRMx01 also includes a lower gantry design for rigidity.
In addition to simplifying the overall design for the
book I was writing, I added a few features that were part
of the wish list I kept in my head while working with my
previous CNC designs. As shown in Figure 6, these
included particleboard shelves, an MDF T-Slot clamp table,
an air exchanger, a dust shroud, and an E-chain for cable
This machine was a dream. I used it to construct parts
for many projects, and even though I have built other
machines since this model, it is still in operation. The step-by-step book based on the KRMx01 CNC took nearly six
months to complete, but it was well worth the effort.
You can see Build 4 in action on You Tube at
While I considered the KRMx01 a success, a true DIY
CNC builder never stops looking for ways to improve the
process. We are also always looking for an excuse to build
the next machine. As with many things, it isn’t just about
the destination. It’s about the journey.
In early January 2012, I was asked to demonstrate my
KRMx01 CNC at the Washington DC Science and
Engineering fair in late April. Doing so brought some
problems to the forefront. The machine wasn’t designed to
be transported, so it was too large to fit through my shop
door. In addition, the design was not conducive to
dismantling and reassembling. What to do? Design a new
machine! And thus, the KRMx02 CNC was born.
While designing this new CNC machine, I wanted to
incorporate the following features:
• Easy to build design adaptable for various size
The KRMx02 (shown in Figure 1 at the beginning of
this article) fits the bill. It has a 30” x 27” cutting area and
sports a full aluminum clamp table.
Now that you know my history, I want to show you
some of the robot related items I have built with my CNC
machines. Before proceeding, let’s review some CNC basics.
This will give you a head start if you decide to build your
CNC stands for Computer Numerical Control. It is a
process where a computer is used to automate the
machining process. There are numerous CNC style
machines, but the one I am about to explain is a basic CNC
mill, or router, in my case.
60 SERVO 03.2012
In addition to the two books mentioned above, the
Kronos Robotics website also has projects, upgrades, and
G-code downloads for CNC routers.