23. REFERENCE INFORMATION
No. 99MBB765A
23.5.15 Rmax (ANSI, VDA), Rz1max (ISO1997): Maximum height
Divide the evaluation profile into segments based on the sampling length. Then, for each
segment, obtain the sum (Zi) of the highest point from the mean line (Pi) and the lowest
point from the mean line (Vi). Rmax (ANSI, VDA) is the maximum value from among Zi (Zn
in the figure below).
(In the following figure, the 4th segment, Z4 is the maximum)
Maximum height of Rmax
23.5.16 RzJIS (JIS2001, Free), Rz (JIS1982, 1994): 10-point mean roughness
Rz (JIS) is the sum of the mean height of the 5 highest peaks and the mean depth of 5
deepest valleys, as measured from a line parallel to the mean line.
Rz 10-point mean roughness
• Evaluation profile mountains/peaks and valleys/floors
When the evaluation profile contains a mean line, portions of the profile that project
above the mean line are called “mountains”, and portions of the profile that project
below the mean line are called “valleys”. The highest point of each mountain is called
the “peak”, and the deepest point of each valley is called the “floor”. However, if the
distance of a peak or floor from the mean line is less than 10% of the Ry value, then
the peak/floor is not regarded as a peak or a floor.
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