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Inclined turning – HEIDENHAIN TNC 640 (34059x-04) ISO programming User Manual

Page 447

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Basis Functions (Software Option 50) 14.2

14

TNC 640 | User's Manual for DIN/ISO Programming | 3/2014

447

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 tool. 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

RL/RR,

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.