HEIDENHAIN TNC 640 (34059x-05) ISO programming - Manual (Page 296)

Programming: Q Parameters
9.2 Part families—Q parameters in place of numerical values
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TNC 640 | User's ManualDIN/ISO Programming | 1/2015
9.2 Part families—Q parameters in place
of numerical values
Application
The Q parameter function D0: ASSIGN assigns numerical values
to Q parameters. This enables you to use variables in the program
instead of fixed numerical values.
Example NC blocks
N150 D00 Q10 P01 +25 * Assign
... Q10 is assigned the value 25
N250 G00 X +Q10 * Corresponds to G00 X +25
You need write only one program for a whole family of parts,
entering the characteristic dimensions as Q parameters.
To program a particular part, you then assign the appropriate values
to the individual Q parameters.
Example: Cylinder with Q parameters
Cylinder radius: R = Q1
Cylinder height: H = Q2
Cylinder Z1: Q1 = +30
Q2 = +10
Cylinder Z2: Q1 = +10
Q2 = +50