HEIDENHAIN TNC 122 User Manual - Manual (Page 51)

7 Executing programs
TNC 122 51
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TOOL
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Executing Programs
There are two ways to run programs on the TNC:
PROGRAM RUN SINGLE BLOCK
Use the NC start key to separately start each block. It is recom-
mended that you use SINGLE BLOCK when running a program for
the first time.
PROGRAM RUN AUTOMATIC
The TNC automatically executes the program block by block until
program run is interrupted or execution of the program has been
completed. Use AUTOMATIC when you are sure the program con-
tains no errors and you want to run it quickly.
Pre-positioning the tool
Before running a part program, always pre-position the tool to pre-
vent the possibility of damaging the tool or workpiece. The best
pre-position lies outside the programmed contour on the extension
of the tool path for machining the first contour point.
Sequence in which the tool approaches the pre-position for milling
⇒
⇒ ⇒ ⇒ ⇒ Change the tool at the clearance height.
⇒ ⇒ ⇒ ⇒ ⇒ Pre-position the tool in X and Y (when the tool axis is Z).
⇒ ⇒ ⇒ ⇒ ⇒ Move the tool to the working depth.
Preparation
⇒ ⇒ ⇒ ⇒ ⇒ Clamp the workpiece to the machine table.
⇒ ⇒ ⇒ ⇒ ⇒ Set the workpiece datum.
⇒ ⇒ ⇒ ⇒ ⇒ Select the program that you wish to run.
Changing the feed rate F during program run
Some machines are equipped with a potentiometer to allow you to
vary the feed rate.
Skipping program blocks
If you wish to start a program at a certain block:
⇒
⇒ ⇒ ⇒ ⇒ Enter the block number.
⇒ ⇒ ⇒ ⇒ ⇒ Start the program as described in this chapter.
Overview of functions
Function key
Stop machine axis movements;
Interrupt program run
Enter the tool data
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