Cycle run, Please note while programming – HEIDENHAIN TNC 320 (34055x-06) Cycle programming User Manual

Page 320

Touch Probe Cycles: Automatic Datum Setting

15.12 DATUM AT CENTER OF 4 HOLES (Cycle 418, DIN/ISO: G418)

320

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

15.12

DATUM AT CENTER OF 4 HOLES (Cycle
418, DIN/ISO: G418)

Cycle run

Touch Probe Cycle 418 calculates the intersection of the lines
connecting opposite holes and sets the datum at the intersection.
If desired, the TNC can also enter the intersection into a datum
table or preset table.

1 Following the positioning logic (See "Executing touch probe

cycles", page 259), the control positions the touch probe at rapid
traverse (value from column

FMAX) to the center of the first hole

2 Then the probe moves to the entered measuring height and

probes four points to find the first hole center.

3 The touch probe returns to the clearance height and then to the

position entered as center of the second hole

4 The TNC moves the touch probe to the entered measuring

height and probes four points to find the second hole center.

5 The TNC repeats steps 3 and 4 for holes

and

6 Finally the TNC returns the touch probe to the clearance height

and processes the determined datum depending on the cycle
parameters Q303 and Q305 (See "Characteristics common to
all touch probe cycles for datum setting", page 284). The TNC
calculates the datum as the intersection of the lines connecting
the centers of holes

and

and saves the actual values in

the Q parameters listed below.

7 If desired, the TNC subsequently measures the datum in the

touch probe axis in a separate probing.

Parameter number

Meaning

Q151

Actual value of intersection point in
reference axis

Q152

Actual value of intersection point in
minor axis

Please note while programming:

Danger of collision!

If you set a datum (Q303 = 0) with the touch probe
cycle and also use probe in TS axis (Q381 = 1), then
no coordinate transformation must be active.

Before a cycle definition you must have programmed
a tool call to define the touch probe axis.