HEIDENHAIN ITNC 530 - 6-2010 DIN-ISO PROGRAMMING User Manual page 258

9.2 Part Families—Q Parameters in
Place of Numerical Values
Function
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 *
...
N250 G00 X +Q10 *
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
Cylinder height
Cylinder Z1
Cylinder Z2
258
Assignment
Q10 is assigned the
value 25
Corresponds to G00 X +25
R = Q1
H = Q2
Q1 = +30
Q2 = +10
Q1 = +10
Q2 = +50
Programming: Q Parameters