Permissible Tool Shapes; Using Other Tools: Delta Values - HEIDENHAIN TNC 620 User Manual

Multiple-axis machining | Three-dimensional tool compensation (option 9)

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 with corner radius (R2 = R: Ball-nose cutter)
These data also provide the coordinates of the tool datum PT.

Using other tools: Delta values

If you use tools that have different dimensions from those of the
originally programmed tools, then you can enter the difference
between the tool lengths and radii as delta values in the tool table or
in the NC program:
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 for the tool position by the sum
of the delta values from the tool table and the programmed tool
compensation (tool call or compensation table).
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 + DR2
Tab Prog
0 < R2 + DR2 + DR2
Tab Prog
R2 + DR2 + DR2
Tab Prog
HEIDENHAIN | TNC 620 | Klartext Programming User's Manual | 01/2022
= End mill
< R: Toroid cutter
= R: ball-nose cutter
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