HEIDENHAIN TNC 640 (34059x-01) - Manual (Page 423)

HEIDENHAIN TNC 640 423
13.2 Basis F
unctions (Sof
tw
ar
e Option 50)
Tool tip radius compensation TRC
Turning tools have a radius at the tool tip (RS). When machining tapers,
chamfers and radii, this results in inaccuracies on the contour because
programmed traverse paths are always referenced to the theoretical
tool tip S (see figure at upper right). TRC prevents the resulting
deviations.
In turning cycles the TNC automatically carries out tool tip radius
compensation. In specific traversing blocks and within programmed
contours, activate TRC with RL or RR.
In turning cycles the TNC 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 TNC only as far as this is possible with the
specific tool. The TNC outputs a warning when residual material is left
behind.
Rs
S
X+
Z+
TO=
8 2
4
1
3
7
5
6
RS
CUTWIDTH
8
2
4
1
3
7
5
6 TO=
X+
Z+
X+
Z+
8
2
4
1
3
7
5
6
RS
X+
Z+
TO=
8 2
4
1
3
7
5
6
9
When the position of the cutting edge is neutral
(TO=2;4;6;8), the direction of the radius compensation is
ambiguous. In this case, TRC is only possible within
cycles.
The TNC can also run tool tip radius compensation during
inclined processing. The following limitation applies here:
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.