HEIDENHAIN TNC 426 (280 476) - Manual (Page 145)

118 5 Programming: Tools
5.4 Thr
ee-Dimensional T
ool Compensation
Peripheral milling: 3-D radius compensation
with workpiece orientation
The TNC displaces the tool perpendicular to the direction of
movement and perpendicular to the tool direction by the sum of the
delta values DR (tool table and TOOL CALL). Determine the
compensation direction with radius compensation RL/RR (see figure at
upper right, traverse direction Y+). For the TNC to be able to reach the
set tool orientation, you need to activate the function M128 (see
“Maintaining the position of the tool tip when positioning with tilted
axes (TCPM*): M128” on page 194). The TNC then positions the
rotary axes automatically so that the tool can reach the defined
orientation with the active compensation.
There are two ways to define the tool orientation:
n
In an LN block with the components TX, TY and TZ
n In an L block by indicating the coordinates of the rotary axes
Example: Block format with tool orientation
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.
1 LN X+31.737 Y+21.954 Z+33.165
TX+0.0078922 TY0.8764339 TZ+0.2590319 F1000 M128
LN : Straight line with 3-D compensation
X, Y, Z : Compensated coordinates of the straight-line end point
TX, TY, TZ : Components of the normalized vector for workpiece
orientation
F : Feed rate
M : Miscellaneous function