July 2013 6.8 The control loop 823
The tolerance consideration at curvature changes can be switched off with
MP1222 for HSC filters and MP1223 for advanced HSC filters, which in most
cases fully suffices for the accuracy, and has shown in the past that a
significantly higher surface quality is achieved. These machine parameters are
typically only used in combination with the HSC filter at resonant frequencies
under 25 Hz when a high accuracy is required.
Selection criteria
and settings for the
nominal position
value filters
The settings for the nominal position value filters mainly depend on the
emphasis of the requirements for machining the workpiece. Speed and
accuracy, in connection with clean and smooth surfaces, are the decisive
criteria.
At the same time, the oscillation and resonance tendencies of the machining
system (the machine tool) are to be considered, and taken into account in the
settings for the nominal position value filters. The following recommendations
can be made for the settings:
Clean surface
Definition of the term "surface":
A clean and smooth surface has the highest priority
Application: Finishing
Oscillations in the axes must be damped, since following errors of 1 µm are
still visible on the surface
Tolerances are typically between 0.01 mm and 0.02 mm (may be slightly
exceeded in order to achieve a better surface)
Settings guidelines for "surface":
Preferential use of the advanced HSC filter (or single filter)
Use M124 for a faulty NC program (from CAD system)
Low jerk values in MP1090.0, MP123x.x
Switch off tolerance consideration for curvature changes, MP1222 and
MP1223 = 0.
High jerk values for MP124x so that no limitations take effect (example: test
MP124x.x up to a value of 1000).
Radial acceleration MP1070 maximum values between 1 and 3 [m/s
2
].
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