SERVO 08.2014 37
Starting the Job
To start the job, hit the Cycle Start button shown in
Figure 20. Keep in mind you will normally start the CNC
spindle before you start the job. In this case, you will be
running a test, so it won't be necessary.
The slowtest will run through the G-Code at a speed of
5 IPM. It will continue to repeat the code until you stop the
job. The machine should not hit any of the table ends. It
should also not stutter (miss steps) as it runs. Let it run for
about an hour, then stop it. If the machine has problems, it
is an indication that your gibs are too tight.
Once the slowtest runs to your satisfaction, load the
MF70 fasttest 4x1.txt file and run it. This test will run the
machine at 15 IPM. This is the fastest speed the MF70 will
run. If it is going to fail, this is when it will happen. Let this
test run for at least two hours.
If you find you can't adjust the play out of the table
without making the gibs too tight, try to back the screws
out until you can run the machine for several hours. Then,
tighten them just a little and run it again for a few hours.
Repeat this until the play has been removed from the table.
Concentrate on a single axis at a time.
This concludes our series. Your machine is now tuned
and ready to make some parts. I am currently in the process
of writing a series of books on converting and upgrading the
MF70 mill, so stay tuned to my website. SV
You can find updates and more
information at the MF70 CNC conversion
The complete Bill of Materials for the
MF70 CNC conversion can be found at
If you need to ask questions, please
use the SERVO Magazine forums located