HEIDENHAIN TNC 640, User Manual, Page: 695 / 948

Turning | Tools in turning mode (option 50)
16
HEIDENHAIN | TNC 640 | Conversational Programming User's Manual | 10/2017
695
Tool tip radius compensation TRC
The tip of a lathe tool has a certain radius (
RS
). When machining
tapers, chamfers and radii, this results in distortions on the contour
because the programmed traverse paths refer to the theoretical
tool tip S. TRC prevents the resulting deviations.
In the turning cycles the control automatically carries out tool radius
compensation. In specific traversing blocks and within programmed
contours, activate TRC with
RL
or
RR
.
The control checks the cutting geometry with the point angle
P-
ANGLE
and the setting angle
T-ANGLE
. Contour elements in the
cycle are processed by the control only as far as this is possible
with the specific tool.
The control outputs a warning when residual material is left
behind. You can suppress the warning with the machine parameter
suppressResMatlWar
(no. 201010).
Programming notes:
The direction of the radius compensation is not
clear when the tool-tip position (
TO=2, 4, 6, 8
) is
neutral. In this case, TRC is only possible within fixed
machining cycles.
The control can also run tool tip radius compensation
during inclined processing.
Active miscellaneous functions limit the possibilities
here:
With
M128
tool-tip radius compensation is
possible only in combination with machining
cycles
M144
or
FUNCTION TCPM
with
REFPNT TIP-
CENTER
also allows tool tip radius compensation
with all traversing blocks, e.g. with
RL
/
RR
Theoretical tool tip
The theoretical tool tip is effective in the tool coordinate system.
When the tool is inclined, the position of the tool tip rotates with
the tool.