Siemens SINUMERIK 840D sl Programming Manual page 211

Position after the end of the measuring cycle
The tool is positioned at the measurement path distance away from the measuring surface.
Tool measurement with stationary spindle
When measuring milling tools, before the measuring cycle is called, the tool with the spindle
must be rotated so that the selected cutting edge can be measured (length or radius).
Tool measurement with rotating spindle
Typically, measurements of the radius of milling tools are executed with rotating spindle,
which means that the largest cutting edge determines the measuring result.
Likewise, it can make sense to measure the length of milling tools with the spindle rotating.
The following must be taken into account:
● Is it permissible to use the tool probe to perform measurements with rotating spindle with
● Permissible peripheral (circumferential) speed for the tool to be measured
● Maximum permissible speed
● Maximum permissible feedrate when probing
● Minimum feedrate when probing
● Selecting the direction of rotation depending on the cutting edge geometry to avoid a hard
● Specified measuring accuracy
When performing a measurement with rotating tool, the ratio between the measuring
feedrate and speed must be taken into account. In this case, a cutting edge is considered.
For multiple cutting edges, the longest cutting edge is responsible for the measuring result.
The following interrelationships have to be taken into account:
n = S / (2π · r · 0.001)
F = n · Δ
Where:
n
S
r
F
Δ
Measuring cycles
Programming Manual, 02/2011, 6FC5398-4BP40-0BA0
length and/or radius calculation? (manufacturer data)
impact when probing at the probe
Speed
Max. permissible peripheral speed
Tool radius
Measuring feedrate
Measuring accuracy
Measuring variants
2.5 Measure tool (milling)
Basic system
Metric Inch
rev/min rev/min
m/min Feet/min
mm Inch
mm/min inch/min
mm Inch
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