HEIDENHAIN TNC 128 (77184x-01) - Manual (Page 312)

312 Positioning with manual data input
12.1 Pr
ogr
amming and ex
ecuting simple mac
h
ining oper
ations
12.1 Programming and executing
simple machining operations
The Positioning with Manual Data Input mode of operation is
particularly convenient for simple machining operations or to pre-
position the tool. You can write the a short program in HEIDENHAIN
conversational programming and execute it immediately. You can also
call TNC cycles. The program is stored in the file $MDI. In the
Positioning with MDI mode of operation, the additional status displays
can also be activated.
Positioning with manual data input (MDI)
Select the Positioning with MDI mode of operation.
Program the file $MDI as you wish
Start the program run: Press the machine START key
Example 1
A hole with a depth of 20 mm is to be drilled into a single workpiece.
After clamping and aligning the workpiece and setting the datum, you
can program and execute the drilling operation in a few lines.
First you preposition the tool with straight-line blocks to the hole
center coordinates at a setup clearance of 5 mm above the workpiece
surface. Then drill the hole with Cycle 200 DRILLING.
Limitation
The following functions are not available in the MDI mode:
 FK free contour programming
 Program section repeats
 Subprogramming
 Path compensation
 The programming graphics
 Program call PGM CALL
 The program-run graphics
Y
X
Z
50
50
0 BEGIN PGM $MDI MM
1 TOOL CALL 1 Z S2000 Call the tool: tool axis Z,
spindle speed 2000 rpm
2 Z+200 R0 FMAX Retract the tool (F MAX = rapid traverse)
3 X+50 R0 FMAX Move the tool at F MAX to a position above the hole