HEIDENHAIN TNC 640 - Page 704

Turning | Turning program functions (option 50)
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HEIDENHAIN | TNC 640 | Conversational Programming User's Manual | 10/2017
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.
The control offers the following methods of inclined turning:
M144
M128
FUNCTION TCPM with REFPNT TIP-CENTER
If the turning cycles are executed with M144, FUNCTION TCPM,
or M128, the angles of the tool to the contour change. The control
automatically takes these modifications into account and thus also
monitors the machining in an inclined state.
Programming notes:
Recessing cycles and threading cycles can be run
with inclined machining only if the tool is at a right
angle (+90°, or –90°).
Tool compensation FUNCTION TURNDATA CORR-
TCS is always effective in the tool coordinate system,
even during inclined machining.
M144
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,
meaning that the workpiece itself is inclined, the control performs
traverse movements in the rotated workpiece coordinate system. If
the inclined axis is a swivel head (meaning that the tool is inclined),
the workpiece coordinate system is not rotated.
After inclining the swivel axis you may have to again pre-position
the tool in the Y coordinate and orient the position of the tool tip
with Cycle 800.
Example
...
12 M144
Activate inclined machining
13 L A-25 R0 FMAX
Position swivel axis
14 CYCL DEF 800 ADJUST XZ SYSTEM
Workpiece coordinate system and align tool
Q497=+90 ;PRECESSION ANGLE
Q498=+0 ;REVERSE TOOL
Q530=+2 ;INCLINED MACHINING
Q531=-25 ;ANGLE OF INCIDENCE
Q532=750 ;FEED RATE
Q533=+1 ;PREFERRED DIRECTION
Q535=3 ;ECCENTRIC TURNING
Q536=0 ;ECCENTRIC W/O STOP