Jerk Filter; Putting A Jerk Filter Into Operation - Siemens SINUMERIK 840D sl Commissioning Manual

8.7

Jerk filter

8.7.1

Putting a jerk filter into operation

Benefits
Reducing the mechanical vibrations generated in the machine can enable a higher surface
quality to be achieved. When milling freeform surfaces, it can be advantageous to smooth the
position setpoint characteristics of the machine axes by means of a jerk filter. The
parameterization of an axial jerk filter depends on the processing technology (dynamic
response mode: DYNNORM, DYNPOS, DYNROUGH, DYNSEMIFIN, DYNFINISH,
DYNPREC) and has the following effect:
● Damping of machine vibrations
● Faster execution
Requirement
After the option is set, the "Jerk filter" softkey is displayed in the operating area
"Commissioning" → Softkey "NC" → Menu forward key.
Function description
For movements outside the workpiece or during roughing, high axial jerk values can be used
in combination with strong damping filters, thus significantly reducing the processing time. An
FIR low pass is parameterized depending on the dynamic mode in order to achieve a different
effect for the respective type of processing. For an FIR low pass, appropriate values for the
frequency and tolerance are entered for each specific dynamic response mode.
Example: If, for DYNROUGH, value is placed on a minimum processing time and, for
DYNPREC, value is placed on maximum processing accuracy, these requirements can be
implemented with a FIR low pass.
The same values for the machine data are calculated and written for all axes in the channel for
the active dynamic response mode in the part program. The CALCFIR instruction must be
programmed after each changeover of the dynamic mode in order to explicitly activate the
calculation for the FIR low pass.
CNC Commissioning: NC, PLC, Drive
Commissioning Manual, 12/2019, A5E48312804B AA
Software option
In order to use this function a license is required for the following option:
"Top Speed" (6FC5800-0_S13-0YB0)
The option includes the use of the FIR low pass filter type and the switchover of
position setpoint filter ladders at axis standstill.
NC commissioning
8.7 Jerk filter
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