Functions
2.17 Jerk filter (axis-specific)
Basic logic functions: Acceleration (B2)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
39
2.16.3
Programming
Programmability
The function is not programmable.
2.17
Jerk filter (axis-specific)
2.17.1
Detailed Description
2.17.1.1
General Information
Overview
In certain application scenarios, e.g.,when milling free-form surfaces, it may be beneficial to
smooth the position setpoint characteristics of the machine axes. This enables surface
quality to be improved by reducing the mechanical vibrations generated in the machine.
For the purpose of smoothing the position setpoint characteristic of a machine axis, a jerk
filter can be activated at position controller level, independently of the channel- and axis-
specific jerk limitations taken into account at interpolator level.
The effect of the jerk filter must be as strong as possible without having an unacceptable
impact on contour accuracy. The filter should also have as "balanced" a smoothing effect as
possible, i.e., if the same contour is traversed forwards and backwards, the contour
smoothed by the filter should be as similar as possible in both directions.
To enable the jerk filter to be optimally matched to the machine conditions, various filter
modes are available:
•
2nd-order filter (PT2)
•
Sliding mean value generation
•
Bandstop filter
Mode: 2nd-order filter
Owing to the fact that it is a simple low-pass filter, "2nd-order filter" mode can only meet the
requirements specified above where relatively small filter time constants (around 10 ms) are
concerned. When used in conjunction with larger time constants, impermissible contour
deviations are soon manifest. The effect of the filter is relatively limited.
This filter mode offers advantages if very large filter time constants are needed and contour
accuracy is only of secondary importance (e.g. positioning axes).
For historical reasons, this filter mode is set as the default.
Summary of Contents for SINUMERIK 840D sl
Page 282: ...Index Basic logic functions Acceleration B2 64 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...
Page 388: ...Basic logic functions Travel to fixed stop F1 Function Manual 11 2006 6FC5397 0BP10 2BA0 52 ...
Page 962: ...Index Basic logic functions Emergency Stop N2 20 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...
Page 1704: ...Constraints Basic logic functions Spindles S1 94 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...
Page 1716: ...Index Basic logic functions Spindles S1 106 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...
Page 1996: ...Index Basic logic functions Tool Offset W1 208 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...
Page 2150: ...Table of contents Basic logic functions Appendix 4 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...
Page 2184: ...Glossary Basic logic functions Appendix 38 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...