ACU-RITE 100S - Manual (Page 16)

100S General Purpose Reference Manual 13
Operation
Setting the Datum (Absolute Zero)
100S GP allows you to measure both absolute and incremental dimen-
sions. A dimension measured from the point you define as the datum is
an absolute dimension. A dimension measured from any other point on
your print is an incremental dimension.
Datum, also known as absolute zero or workpiece zero, is the reference
point from which
100S GP will base all of your part’s coordinates.
When the readout is in the ABS mode, it is actually measuring the dis-
tance from the datum to the machine axis’ current position.
You will need to establish a datum for every job. Your datum may al-
ready be identified on your print; if it isn’t, then establish a datum that
allows you to measure most of your part’s dimensions directly, with the
least number of calculations.
All of the dimensions in the drawing below are based from the datum.
Absolute zero