HEIDENHAIN TNC 640 (34059x-01) - Manual (Page 414)

414 Programming: Turning Operations
13.1 T
u
rn
ing Oper
ations on Milling Mac
h
ines (Sof
tw
ar
e Option
50)
13.1 Turning Operations on Milling
Machines (Software
Option 50)
Introduction
Special types of milling machines allow performing both milling and
drilling operations. A workpiece can thus be machined completely on
one machine without rechucking, even if complex milling and turning
applications are required.
Turning operations are machining processes by which workpieces are
rotated, thus implementing the cutting movements. A fixed tool
carries out infeed and feed movements. Turning applications,
depending on machining direction and task, are subdivided into
various production processes, e.g. longitudinal turning, face turning,
groove turning or thread turning. The TNC offers you several cycles for
each of the various production processes (see User's Manual, Cycles,
"Turning" chapter).
On the TNC you can simply switch between Milling and Turning mode
within the NC program. In Turning mode, the rotary table serves as
turning spindle, whereas the milling spindle with the tool is fixed. This
enables rotationally symmetric contours to be created. The preset
must be in the center of the turning spindle.
With the management of turning tools, other geometric descriptions
are considered than with milling or drilling tools. To be able to execute
tool radius compensation, for example, you have to define the tool
radius. To support these definitions, the TNC provides a special tool
management for turning tools (see "Tool data" on page 421).
Different cycles are available for machining. These can also be used
with additionally inclined swivel axes: See “Inclined turning” on
page 431.
The assignment of the axes with turning is defined so that the X
coordinates describe the diameter of the workpiece and the Z
coordinates the longitudinal positions.
Programming is thus always done in the XZ coordinate plane. The
machine axes to be used for the required motions depend on the
respective machine kinematics and are determined by the machine
manufacturer. This makes NC programs with turning functions largely
exchangeable and independent of the machine model.
+Z
+X
+Y
S2'
+C
+A
Z
X
C