HEIDENHAIN TNC 310 (286 140) - Manual (Page 172)

10 Programming: Q Parameters 160
1
0.1 Pr
inciple and Ov
erview
10.1 Principle and Overview
You can program an entire family of parts in a single part program.
You do this by entering variables called
Q parameters instead of fixed
numerical values.
Q parameters can represent information such as:
■ Coordinate values
■ Feed rates
■ RPM
■ Cycle data
Q parameters also enable you to program contours that are defined
through mathematical functions. You can also use Q parameters to
make the execution of machining steps depend on logical conditions.
Q parameters are designated by the letter Q and a number between
0 and 299. They are grouped according to three ranges:
Meaning Range
Freely applicable parameters, global for Q0 to Q99
all programs in the TNC memory. When y
ou call OEM cycles, these parameters are
only effective locally (depending on MP7251).
Parameters for special TNC functions Q100 to Q150
Parameters that are primarily used for cycles, Q200 to Q299
globally effective for all programs and OEM
cycles that are stored in the TNC memory
Programming notes
You can mix Q parameters and fixed numerical values within a
program.
Q parameters can be assigned numerical values between
–99 999.9999 and +99 999.9999.
Some Q parameters are always assigned the same data
by the TNC. For example, Q108 is always assigned the
current tool radius. For further information, see section
“10.9 Preassigned Q Parameters.”
Q4
Q2
Q3 Q1
Q5
Q6