Siemens SINUMERIK 828D Programming Manual page 90

Tool offsets
5.8 Programmable tool offset (TOFFL, TOFF, TOFFR)
Further information
Applications
The "Programmable tool offset" function is especially interesting for ball mills and milling
tools with corner radii as these are often calculated in the CAM system to the ball center
instead of the ball tip. However, generally the tool tip is measured when measuring the tool
and stored as tool length in the compensation memory.
System variables for reading the current offset values
The currently effective offsets can be read with the following system variables:
System variables
$P_TOFFL [<n>]
$P_TOFF [<geometry axis>]
$P_TOFFR
$AC_TOFFL[<n>]
$AC_TOFF[<geometry axis>]
$AC_TOFFR
Note
The system variables $AC_TOFFL, $AC_TOFF and AC_TOFFR trigger an automatic
preprocessing stop when reading from the preprocessing context (NC program).
90
Meaning
with 0 ≤ n ≤ 3 Reads the current offset value of
n = 0) or
preprocessing context.
Reads the current offset value of
TOFF[<geometry axis>]
context.
Reads the current offset value of
preprocessing context.
with 0 ≤ n ≤ 3 Reads the current offset value of
n = 0) or
main run context (synchronized actions).
Reads the current offset value of
TOFF[<geometry axis>]
context (synchronized actions).
Reads the current offset value of
main run context (synchronized actions).
Programming Manual, 07/2010, 6FC5398-1BP40-0BA0
TOFFL
(for n = 1, 2, 3) in the
TOFFL[1...3]
in the preprocessing
TOFFR
TOFFL
(for n = 1, 2, 3) in the
TOFFL[1...3]
in the main run
TOFFR
(for
in the
(for
in the
Fundamentals