HEIDENHAIN TNC 640, User Manual, Page: 634 / 948

Multiple-Axis Machining | Three-dimensional tool compensation (option 9)
13
634
HEIDENHAIN | TNC 640 | Conversational Programming User's Manual | 10/2017
Permissible tool shapes
You can describe the permissible tool shapes in the tool table via
tool radii
R
and
R2
:
Tool radius
R
: Distance from the tool center to the tool
circumference
Tool radius 2
R2
: Radius of the curvature between the tool tip
and tool circumference
The value of
R2
generally determines the shape of the tool:
R2
= 0: End mill
R2
> 0: toroid cutter (
R2
=
R
: spherical cutter)
These data also provide the coordinates of the tool reference point
PT.
Using other tools: Delta values
If you want to use tools that have different dimensions than the
ones you originally programmed, you can enter the difference
between the tool lengths and radii as delta values in the tool table
or
TOOL CALL:
Positive delta value
DL, DR
: The tool is larger than the original
tool (oversize)
Negative delta value
DL, DR
: The tool is smaller than the original
tool (undersize)
The control then compensates the tool position by the total of the
delta values from the tool table and the tool call.
With
DR 2
you modify the rounding radius of the tool and therefore
also the tool shape.
If you work with
DR 2
the following applies:
R2 + DR2
Tab
+ DR2
Prog
= End mill
0 < R2 + DR2
Tab
+ DR2
Prog
< R: Toroid cutter
R2 + DR2
Tab
+ DR2
Prog
= R: Radius cutter