HEIDENHAIN TNC 640 (34059x-05) ISO programming - Manual (Page 476)

Programming: Turning Operations
14.5 Turning program functions (Option #50)
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TNC 640 | User's ManualDIN/ISO Programming | 1/2015
Inclined turning
It may sometimes be necessary for you to bring the swivel axes
into a specific position to machine a specific process. This can
be necessary for example when you can only machine contour
elements according to a specific position due to tool geometry.
Inclining a swivel axis creates an offset from tool to tool. The
function
M144 considers the position of the inclined axes and
compensates this offset. In addition the function M144 aligns the
Z direction of the workpiece coordinate system to the direction of
the centerline of the workpiece. If an inclined axis is a tilting table,
so that the workpiece is sloping, the TNC runs traverse movements
in the displaced workpiece coordinate system. If the inclined axis is
a swivel head (tool is sloping) the workpiece coordinate system is
not displaced.
After inclining the swivel axis you may have to again pre-position
the tool in the Y coordinates and orient the position of the tool tip
with the cycle 800.
Alternatively to function
M144 you can also use function M128.
The effect is identical, but the following limitation applies: The
TNC can also run tool tip radius compensation during inclined
processing. If you activate inclined processing with M128 then tool
tip radius compensation without a cycle, i.e. in traversing blocks
with
G41/G42, is not possible. If you activate inclined processing
with M144 this limitation does not apply.
If the turning cycles are executed with M144, the angles of the
tool to the contour change. The TNC automatically takes these
modifications into account and thus also monitors the machining in
inclined state.
You can use recessing cycles and thread cycles with
inclined machining only with a rectangular tool angle
(+90°, -90°).
Tool compensation
FUNCTION TURNDATA CORR-
TCS is always effective in the tool coordinate system,
even during inclined machining.