MITS Eleven Auto FPZ-31AT, Command Manual, Page: 75 / 108

74
Calibrate Thickness
In absolute milling and absolute step milling,
we recommend to calibrate the board thickness.
Sometimes when the thickness value is not calibrated,
the tool bit goes into the surface too deep or too shallow. It may
cause not only the unexpected result of milling but also the
overload of tool and spindle motor.
When Down button is clicked in Manual screen,
the spindle head goes down to the table with
non-stop.
When Surface button is
clicked in Manual screen,
Surface screen appears.
Z- and Z+ buttons
allows you to move the
head up and down
incrementally.
Z move field is the move distance of clicking Z- and Z+ each time. To
surface field shows the distance left between the tip of drill bit and the board
surface.
Click Z+ to move the spindle head down.
Getting close to the surface, To surface value is reduced.
Finally, the tip of bit reaches the surface.
At this point, we believe To surface field shows zero theoretically. In many
case, however, it is not zero. We know it is a tolerance. You can add this
tolerance to the thickness of Board or Underlay. This is how to calibrate the
board thickness.