Programming And Executing Simple Machining Operations - HEIDENHAIN TNC 426 B User Manual

3.1 Programming and Executing
Simple Machining Operations
The operating mode Positioning with Manual Data Input is
particularly convenient for simple machining operations or pre-
positioning of the tool. It enables you to write a short program in
HEIDENHAIN conversational programming or in ISO format, and
execute it immediately. You can also call TNC cycles. The program is
stored in the file $MDI. In the operating mode Positioning with MDI,
the additional status displays can also be activated.
Select the Positioning with MDI mode of
operation. Program the file $MDI as you wish.
To start program run, press the machine START
button.
Limitation: FK free contour programming, programming
graphics and program run graphics cannot be used. The
$MDI file must not contain a program call (PGM CALL).
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 pre-position the tool in L blocks (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 1 PECKING.
0 BEGIN PG $ DI
1 TOOL DEF 1 L+0 R+5
2 TOOL CALL 1 Z S2000
3 L Z+200 R0 F AX
4 L X+50 Y+50 R0 F AX
5 L Z+5 F2000
6 CYCL DEF 1.0 PECKING
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3
Z
Y
50
Define tool: zero tool, radius 5
Call tool: tool axis Z
Spindle speed 2000 rpm
Retract tool (F MAX = rapid traverse)
Move the tool at FMAX to a position above the
borehole, spindle on
Position tool to 5 mm above hole
Define PECKING cycle:
3 Positioning with Manual Data Input (MDI)
X
50