Compensation Strategy - Siemens SINUMERIK 840D sl Programming Manual

Measuring Cycles for Milling and Machining Centers
5.2 CYCLE971 tool: Measuring milling tools, drills
● Selection of the rotation direction depending on the cutting edge geometry to prevent
● Required measuring accuracy.
When measuring with rotating tool the relation between measuring feedrate and speed must
be taken into account. One cutting edge is taken into account. With multiple cutters, the
longest edge is used for the measuring result.
The following connections have to be taken into account:
n = S / (2π • r • 0.001)
F = n • Δ
Where:
n
I
r
F
Δ
Example:
Given a peripheral speed of S = 90 m/min, speeds of n = 2865 to 143 rpm will result for
milling tools with a radius of r = 5 to 100 mm.
Given a specified measuring accuracy of Δ = 0.005 mm measuring feedrates of
F= 14 mm/min to F= 0.7 mm/min will result.
5.2.2.2

Compensation strategy

The tool measuring cycle is provided for various applications:
● First-time measurement of a tool
● Remeasurement of a tool (_CHBIT[3]=1):
Further, for tool measurement, the measured values can be corrected by empirical values.
Compensation of length 1 or the tool radius only occurs in tool measurement if the measured
difference lies in the tolerance band between _TZL and _TDIF!
Compensation of the tool probe trigger points _TP[ ] and. _TPW[ ] only occurs when the tool
probe is calibrated if the measured difference lies in the tolerance band between _TZL and
_TSA!
96
hard impacts when probing.
Spindle speed
Max. permissible peripheral speed
Tool radius
Measuring feedrate
Measuring accuracy
(_CHBIT[3]=0):
The tool offset values in geometry and wear are replaced.
Compensation is written in the geometry component of length or radius. The wear
component is reset.
The resulting difference is calculated into the wear component (radius or length).
Metric
rpm
m/min
mm
mm/min
mm
Programming Manual, 03/2009 Edition, 6FC5398-4BP10-2BA0
Basic system
inch
rpm
feet/min
inch
inch/min
inch
Measuring cycles