HEIDENHAIN TNC 620 User Manual page 265

Testing and running | Test run
Keep the following in mind when performing a test run
With cuboid workpiece blanks, the control starts a test run after a
tool call at the following position:
In the working plane in the center of the defined BLK FORM
In the tool axis, 1 mm above the MAX point defined in the BLK
FORM
With rotationally symmetrical workpiece blanks, the control starts a
test run after a tool call at the following position:
In the machining plane at the position X=0, Y=0
In the tool axis 1 mm above the defined workpiece blank
The FN 27: TABWRITE and FUNCTION FILE functions are only
considered in the Program run, single block and Program run, full
sequence operating modes.
Danger of collision!
In the Test Run operating mode, the control does not take all
axis movements of the machine into consideration (e.g., PLC
positioning movements as well as movements from tool-change
macros and M functions). Thus, the test might be performed
without errors, but later operation will deviate from these results.
Danger of collision during machining!
Test the NC program using the later machining position
(BLANK IN WORK SPACE)
Program a safe intermediate position after the tool change and
before prepositioning
Carefully test the NC program in the Program run, single
block operating mode
Refer to your machine manual.
Your machine tool builder can also define a tool-change
macro for the Test Run operating mode. This macro will
simulate the exact behavior of the machine.
In doing so, the machine tool builder often changes the
simulated tool change position.
HEIDENHAIN | TNC 620 | User's Manual for Setup, Testing and Running NC Programs | 01/2022
NOTICE
6
265