HEIDENHAIN ND 1100 - Manual (Page 32)

Chapter 2 Operation
2-12
Datum Datum Datum Datum Datum
Select the absolute datum (Abs) if necessary by pressing the Abs/
Abs/ Abs/ Abs/ Abs/
Inc softkey Inc softkey Inc softkey Inc softkey Inc softkey. The selected datum will be displayed at the lower left
corner of the LCD. This selection can be changed at any time.
Zeroing datums Zeroing datums Zeroing datums Zeroing datums Zeroing datums
The system simultaneously uses 2 reference datums for measure-
ments. One is fixed (absolute), while the other can be redefined
(incremental) during the measurement session to make incremen-
tal measurements. Reference points for absolute and incremental
measurements can be set by zeroing the Abs
Abs Abs Abs Abs (absolute) and Inc Inc Inc Inc Inc
(incremental) datums.
Absolute datum Absolute datum Absolute datum Absolute datum Absolute datum
Absolute measurements are those referred to the absolute datum.
The absolute datum is defined as the origin (0,0), and should be
set at the beginning of each measurement session. To set the
absolute datum:
Step 1
Move the stage to target the
point you wish to define as the
origin, or absolute datum point,
and press the Abs/Inc softkey
Abs/Inc softkey Abs/Inc softkey Abs/Inc softkey Abs/Inc softkey
if necessary to select Abs Abs Abs Abs Abs in the lower left corner of the LCD screen.
Step 2
Press the Zero axes keys
Zero axes keys Zero axes keys Zero axes keys Zero axes keys to
zero-out the measurement axes
on the DRO screen.
Incremental datum Incremental datum Incremental datum Incremental datum Incremental datum
An incremental measurement is
one that is made between any
reference point and some other
point. Incremental measure-
ments are facilitated in the QC100 by the incremental datum which
can be zeroed at any point on or off the part without changing
the absolute datum.