HEIDENHAIN TNC 640 User Manual page 332

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The following icons are displayed by the control only in certain

The most recent step is undone.

Contour assumption mode:

The tolerance specifies how far apart neighbor-

ing contour elements may be from each other.

You can use the tolerance to compensate for

inaccuracies that occurred when the drawing

was made. The default setting is 0.001 mm

Arc mode defines whether circular arcs are

output in C format or CR format (e.g. for cylin-

der surface interpolation) in the NC program.

Point assumption mode:

Specify whether the control should display the

tool path as a dashed line during selection of

machining positions

Path optimization mode:

The control optimizes the tool traverse

movement to give the shortest traverse

movements between the machining positions.

Optimization is reset with repeated actuations

Hole position mode:

The control opens a pop-up window in which

you can filter the holes by size

Operating notes:

Set the correct unit of measure, since the CAD file

does not contain any such information.

When generating NC programs for previous control

models, you must limit the resolution to three

decimal places. In addition, you must remove the

comments that the CAD-Viewer inserts into the

contour program.

The control displays the active basic settings in the

status bar of the screen.

Data Transfer from CAD Files | CAD import (option 42)

HEIDENHAIN | TNC 640 | ISO Programming User's Manual | 10/2017