HEIDENHAIN TNC 320 (34055x-06) Cycle programming User Manual

Page 284

Touch Probe Cycles: Automatic Datum Setting

15.1 Fundamentals

284

TNC 320 | User's Manual Cycle Programming | 5/2013

Characteristics common to all touch probe cycles for
datum setting

You can also run the Touch Probe Cycles 408 to 419
during an active rotation (basic rotation or Cycle 10).

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.

Active touch probe axis

Datum setting in

X and Y

Z and X

Y and Z

Saving the calculated datum

In all cycles for datum setting you can use the input parameters
Q303 and Q305 to define how the TNC is to save the calculated
datum:

Q305 = 0, Q303 = any value

: The TNC sets the calculated

datum in the display. The new datum is active immediately. At
the same time, the TNC saves the datum set in the display by
the cycle in line 0 of the preset table.

Q305 not equal to 0, Q303 = –1

This combination can only occur if you

read in programs containing Cycles 410 to 418
created on a TNC 4xx

read in programs containing Cycles 410 to 418
created with an older software version on an iTNC
530

did not specifically define the measured-value
transfer with parameter Q303 when defining the
cycle.

In these cases the TNC outputs an error message,
since the complete handling of REF-referenced
datum tables has changed. You must define a
measured-value transfer yourself with parameter
Q303.

Q305 not equal to 0, Q303 = 0

The TNC writes the calculated

reference point in the active datum table. The reference
system is the active workpiece coordinate system. The value of
parameter Q305 determines the datum number.

Activate the

datum with Cycle 7 in the part program.

Q305 not equal to 0, Q303 = 1

The TNC writes the calculated

reference point in the preset table. The reference system is
the machine coordinate system (REF coordinates). The value of
parameter Q305 determines the preset number.

Activate the

preset with Cycle 247 in the part program.