HEIDENHAIN TNC 640, User Manual, Page: 338 / 948

Data Transfer from CAD Files | CAD import (option 42)
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HEIDENHAIN | TNC 640 | Conversational Programming User's Manual | 10/2017
The following icons are displayed by the control only in certain
modes.
Icon Setting
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:
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.