36
Programming in the workshop
– Field-proven turning cycles (option)
In the area of milling cycles, too, the
TNC 640 offers a comprehensive and
technologically ambitious package. They
are equivalent to the proven and fully
developed kernel functions of the
HEIDENHAIN lathe controls. The user
interface, however, is inspired in its look
and functionality by the familiar and proven
plain-language dialog. Cycle parameters
that come into use both for milling and
turning are, of course, used with the same
number. For turning operations, as well,
you are supported during programming as
accustomed with explanatory graphics.
Machining simple contours
Various cycles are available for machine
simple contours in longitudinal and
transverse direction. The surface to be
machined might also be inclined and can
require a plunging movement. Naturally,
the TNC 640 fully automatically takes the
angle of the turning tool into account.
Machining any desired contours
If the contours to be machined become
more complex and can no longer be
defi ned with simple cycle parameters,
you can describe them using contour
subprograms. The process is completely
identical to the procedure when using SL
cycles in milling: with Cycle 14 you defi ne
the subprogram in which the fi nished
contour is described, and in the respective
turning cycle you specify the technological
parameters.
During contour description, too, you use
exactly the same conversational functions
as when defi ning a milling contour, which
of course includes FK free contour pro-
gramming. Moreover, the turning-specifi c
contours elements recess and undercut
are available, which you can insert between
contour elements like chamfers and
rounding arcs. Besides radial and axis
recesses, undercuts are available of the
forms E, F, H, K, U and thread undercuts.
Depending on the cycle, the TNC 640
machines parallel to the axis or the contour.
You defi ne the machining operations
(roughing, fi nishing) or oversize under
dialog guidance through the corresponding
parameters.
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