HEIDENHAIN TNC 620 (340 56x-03) - Manual (Page 381)

HEIDENHAIN TNC 620 381
1
1
.6 Thr
ee-Dimensional T
ool Compensation (Sof
tw
ar
e Option 2)
3-D compensation without TCPM
The TNC carries out a 3-D compensation for three-dimensional
machining operations if the NC program contains surface-normal
vectors. In this case, the RL/RR radius compensation and TCPM or M128
must be inactive. The TNC displaces the tool in the direction of the
surface-normal vectors by the sum of the delta values (tool table and
TOOL CALL
).
Example: Block format with surface-normal vectors
Face milling: 3-D compensation with TCPM
Face milling is a machining operation carried out with the front face of
the tool. A three-dimensional compensation is carried out during five-
axis machining if the NC program contains surface-normal vectors and
TCPM
or M128 is active. In this case, the RL/RR radius compensation
must not be active. The TNC displaces the tool in the direction of the
surface-normal vectors by the sum of the delta values (tool table and
TOOL CALL
).
If TCPM (see "Maintaining the position of the tool tip when positioning
with tilted axes (TCPM): M128 (software option 2)", page 369) is
active, the TNC maintains the tool perpendicular to the workpiece
contour if no tool orientation is programmed in the LN block.
If there is a tool orientation T defined in the LN block and M128 (or TCPM
FUNCTION
) is active at the same time, then the TNC will position the
rotary axes automatically so that the tool can reach the defined
orientation.
Z
Y
X
P
T
NZ P
NX
NY
1 LN X+31.737 Y+21.954 Z+33.165
NX+0.2637581 NY+0.0078922 NZ-0.8764339 F1000 M3
LN : Straight line with 3-D compensation
X, Y, Z : Compensated coordinates of the straight-line end point
NX, NY, NZ : Components of the surface-normal vector
F : Feed rate
M : Miscellaneous function
Z
Y
X
TX TY
TZ
The TNC is not able to automatically position the rotary
axes on all machines. Refer to your machine manual.
Danger of collision!
On machines whose rotary axes only allow limited
traverse, sometimes automatic positioning can require
the table to be rotated by 180°. In this case, make sure
that the tool head does not collide with the workpiece or
the clamps.