HEIDENHAIN iTNC 530 (34049x-08) ISO programming - Manual (Page 106)

106 Programming: Fundamentals, file management
3.1 F
undamentals
Setting the datum
A production drawing identifies a certain form element of the
workpiece, usually a corner, as the absolute datum. When setting the
datum, you first align the workpiece along the machine axes, and then
move the tool in each axis to a defined position relative to the
workpiece. Set the display of the TNC either to zero or to a known
position value for each position. This establishes the reference system
for the workpiece, which will be used for the TNC display and your part
program.
If the production drawing is dimensioned in relative coordinates,
simply use the coordinate transformation cycles (see User’s Manual
for Cycle Programming, Cycles for Coordinate Transformation).
If the production drawing is not dimensioned for NC, set the datum at
a position or corner on the workpiece from which the dimensions of
the remaining workpiece positions can be most easily measured.
The fastest, easiest and most accurate way of setting the datum is by
using a touch probe from HEIDENHAIN. See "Datum setting with
touch probes" in the Touch Probe Cycles User’s Manual.
Example
The workpiece drawing shows holes (
1 to 4 ) whose dimensions are
shown with respect to an absolute datum with the coordinates X=0
Y=0. Holes
5
to
7
are dimensioned with respect to a relative datum
with the absolute coordinates X=450, Y=750. With the DATUM SHIFT
cycle you can temporarily set the datum to the position X=450, Y=750,
to be able to program holes 5 to 7 without further calculations.
Y
X
Z
MAX
MIN
X
Y
325
320
0
450 900
950
150
-150
750
0
30
0±
0,
1
2 1
3 4
7
6
5