HEIDENHAIN TNC 426B (280 472) Touch Probe Cycles - Manual (Page 55)

HEIDENHAIN TNC 426, TNC 430 43
3.2 A
u
to
matic D
at
u
m Set
ting
Characteristics common to all touch probe
cycles for datum setting
Datum point and touch probe axis
From the touch probe axis that you have defined in the measuring
program the TNC determines the working plane for the datum:
Writing the calculated datum to a datum table
In all cycles for datum setting you can use the input parameter Q305
to define whether you wish the TNC to set the calculated datum
shown in the display or enter it in a datum table.
In TNCs with NC software 280 476-xx you may also run
the touch probe cycles 410 to 418 during an active basic
rotation (basic rotation or Cycle 10). In previous versions
the TNC displays an error message if the basic rotation is
active.
Active touch probe axis Datum setting in
Z or W X and Y
Y or V Z and X
X or U Y and Z
If you want the calculated datum to be entered in a datum
table, you must first activate a datum table (status M) in a
program run mode before starting the measuring program.
When writing to a datum table, the TNC observes machine
parameter 7475:
MP7475 = 0: Values are referenced to workpiece datum,
MP7475 = 1: Values are referenced to the machine datum.
If you change the setting in MP7475, the TNC does not
convert the values already saved in datum tables.