and the black wire to L. Take the red and black hookup
wire and strip about 1/2” of the insulation from both ends.
Connect each wire to the provided power connector
(Figure 15). It is important to take note of the orientation
of the red and black wires.
Connect the other end of the red wire to the terminal
on the power supply marked V+. Connect the other end of
the black wire to the terminal on the power supply marked
V- (refer to Figure 16).
Before starting, I want
to talk a little about how
to interface the CNC to a
PC. The easiest way is with
a parallel port.
Unfortunately, PCs with
parallel ports are harder
and harder to come by
unless you build your own
In addition, the Mach3
controller software only
supports the parallel port on a
32-bit version of Windows. The
Mach3 parallel port driver does
not work on any version of
Okay, what do you do if
you can’t use a parallel port? In
this case, you have to offload
the control of the CNC to a
smart controller. One such
controller that I have used is
called the SmoothStepper. They
will run you about $180, so a
parallel port is always my first
I’m not going to cover using the SmoothStepper, as I
already have instructions on my website. I will provide a link
on my KReduCNC support pages.
There are other options, as well. I have successfully
added an Arduino Uno to my SainSmart and then used
software to drive it from a USB interface in all versions of
For this project, I will be employing Mach3 on a 32-bit
Windows 7 PC, using a parallel port.
The PC shown in Figure 17 is a machine I just picked
up at a local thrift store. The machine was $15; the
monitor was $5. I lucked out as it had 32-bit Windows 7
Pro already installed. All I had to do was add a mouse
and keyboard (which I purchased earlier for about $5).
40 SERVO 11.2016
A complete bill of materials, as well as additional information can
be found on my website at www.kronosrobotics.com
/kreducnc. For any questions or comments, please visit the
SERVO Magazine forums at http://forum.nutsvolts.com/