HEIDENHAIN TNC 128 (77184x-01) - Manual (Page 156)

156 Programming: Tools
5.3 T
ool compensation
Tool radius compensation for paraxial
positioning blocks
The TNC can compensate the tool radius in the working plane with the
aid of paraxial positioning blocks. You can enter the dimensions
directly from the drawing without first having to convert the positions.
The TNC extends or shortens the traverse path by the tool radius.
 R+ extends the tool path by the tool radius
 R– shortens the tool path by the tool radius
 R0 positions the tool using the tool center
Radius compensation becomes effective as soon as a tool is called
and is moved with a straight line block in the working plane.
For radius compensation, the TNC takes the delta values from both the
TOOL CALL
block and the tool table into account:
Compensation value = R + DR
TOOL CALL
+ DR
TAB
where
Contouring without radius compensation: R0
The tool center moves in the working plane along the programmed
path or to the programmed coordinates.
Applications: Drilling and boring, pre-positioning
Radius compensation is not effective for positioning
movements in the spindle axis.
The last selected radius compensation remains active in a
positioning block that does not contain any information
about radius compensation.
R : Tool radius R from the TOOL DEF block or tool table
DR
TOOL CALL
: Oversize for radius DR in the TOOL CALL block
DR
TAB
: Oversize for radius DR in the tool table
Y
X
Z
X
Y