14 - 7
No. 99MBB091A
14. REFERENCE INFORMATION
■ Motif
Generally, when waviness components are removed from a primary profile using filters, the
primary profile is subjected to distortion. One method to remove waviness components from
a primary profile without distorting it is by using the motif method.
With this method, a primary profile is divided into units called “motifs” which are based on
the wavelength of a component to be removed, and parameters to evaluate the profile are
calculated from each motif.
R1
Ri
Ri+1
R
2Nmr
AR
Nmr
ARj
Evaluation length ᐉn
AR1
Primary profile
■ DIN4776 profile
For surfaces to be measured having deep valleys with respect to the irregularity on the
surface, the position of the mean line may be calculated to the position shifted from the
position where it is supposed to be for surface roughness evaluation.
However, by this procedure, those negative effect can be avoided to a certain extent.
The actual procedure is shown below.
1. The first mean line is obtained with respect to the input data.
To Next Page
Loading...
