Machine
Error
Compensation
(MEC)
A
standard
vertical
milling machine would not have
any error if
its
table
movements followed
perfectly
straight lines.
This, however, is not
the
case.
There
will
always
be some
finite
transfer error.
Machine errcr can
be seen as the difference between the actual
length
of a
standard
gauge
block
and the
value
displayed by the digital
readout.
This
error
will
also be
present
in any
workpiece
machined
in
that axis.
Machine Error
Compensation
(MEC)
multiplies
the
internal
display
count by a
conversion
factor
such
that the displayed
value will
be correct.
This factor is
stored
in
the display's
non-volatile
memory
and
is
set at the
factory
to a
1:1 ratio.
Example: A 10.0000 inch standard
gauge
block
is measured
on a
knee mill
using
standard
machine
shop
practices yielding
a
result
of
10.0050
inch. MEC
will re-proportion
the dimension so that the display
willthen
indicate
the correct
measurement
of
10.0000 inches
of travel.
The
0.0050
inch
error
had
been
displaced
within
the
10.0000 inches of
travel.
Displayed MEC factor range is from
-0.999999
to
+0.999999.
MEC Factql
=
Measured Value
-
Gauge
Value
Measured
Value
MEC
should
be
a one time
job.
However,
an operator
may wish
to
recalibrate
for
a
particular
area on the
machine
table
where
a
particular
work is
performed.
Although MEC
can compensate
for machine
table
problems,
it is not
intended
as
a substitute for
proper
machine maintenance.
Viewing
the
MEC
Factor
Set the
MEC
switch
on the back of the display to CAL and
hold
the
A/l
button
(see
Figure
47). The MEC factor willthen
be displayed.
When finished, move
the
MEC
switch back
to OFF.
43
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