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

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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 + DR2
Tab
0 < R2 + DR2
Tab
R2 + DR2 + DR2
Tab
582
Multiple-Axis Machining | Three-dimensional tool compensation (option 9)
= End mill
Prog
+ DR2 < R: Toroid cutter
Prog
= R: Radius cutter
Prog
HEIDENHAIN | TNC 620 | Conversational Programming User's Manual | 10/2017