HEIDENHAIN TNC 406 - Manual (Page 223)

202 10 Programming: Q Parameters
1
0.9 Q P
ar
amet
ers with Special F
u
nctions
10.9 Q Parameters with Special
Functions
Vacant Q parameters
Q parameters Q0 to Q79 are freely programmable.
The TNC always uses the last numerical value assigned to these
Q parameters (see Chapter 8).
When programming part families with Q parameters, you should only
use ”vacant” Q parameters. This ensures that the TNC does not
overwrite a parameter used in the program.
Preassigned Q parameters
The TNC always assigns the same values to the following
Q parameters, e.g. the electrode radius or the current generator
power stage.
Q parameters with special functions
Some Q parameters have special functions. For example, the TNC
uses these parameters to transfer values between the program and
the datum table:
Q80 to Q84
Preassigned Q parameters
Additional erosion parameters: Q96, Q97, Q98
If you work with erosion tables, the machine tool builder can store
additional erosion parameters in the Q parameters Q96, Q97 and Q98.
The machine tool builder can give you more information about these
Q parameters.