Markers In The Plc - HEIDENHAIN TNC 415 Technical Manual

The probing feed rate is calculated from the calculated rotational speed and the measuring tolerance
given in MP6510.
×
v= Meas. tolerance
MP6507 defines the method of calculating the probing feed rate:
MP6507=0: Calculation of the feed rate with constant tolerance
This setting guarantees that the measuring tolerance remains constant regardless of the tool radius
(MP6510). If the tool is very large, however, the necessary probing feed rate comes so close to zero
that it falls below the lowest programmable increment. The smaller the maximum surface cutting
speed and the permissible measuring error, the sooner this effect becomes noticeable.
MP6507=1: Calculation of the feed rate with variable tolerance
In this setting the permissible measuring tolerance changes depending on the tool radius. This
ensures that there is a probing feed rate even for large tool radii. The measuring tolerance changes
according to the following table:
Tool radius
up to 30 mm
30 to 60 mm
60 to 90 mm
90 to 120 mm
MP6507=2: Constant probing feed rate
The probing feed rate remains constant regardless of the tool. The absolute measuring error grows
linearly with increasing tool radius.
r
Meas. tolerance =
5 [mm]
v = Meas. tolerance × n
×
MP6570 MP6510
v =
−
× π 10 ×
3
10

Markers in the PLC

Marker M2390 is set when a tool measuring cycle is started. Marker M2391 indicates whether a
cycle for tool measurement or tool inspection was activated. If inspection shows that one of the
entered tolerances is exceeded, the tool is inhibited and Marker M2392 or M2393 is set.
Markers M2502, M2503, M2022, M2023, M2025 and M2026 function as in the standard probing
cycles. The cycles for tool measurement must therefore also be released by the PLC with Marker
M2503.
If the spindle is oriented directly by the NC (MP6560 = –1), Marker M2499 must be reset by the
PLC.
01.98 TNC 407/TNC 415/TNC 425
Meas. tolerance =
n
n =
Measuring tolerance
MP6510
2 × MP6510
3 × MP6510
4 × MP6510
r =
× MP6510
MP6510 =
v =
MP6570 = Maximum permissible surface speed at the
9 Touch probe
Meas. tolerance [mm] depending on MP6507
Rotational speed [rpm]
etc.
Tool radius [mm]
Max. permissible measuring error [mm]
Probing feed rate [m/min]
cutting edge [m/min]
4-193