surface finish 1

[brobinson]

looking for info on the heidelberg hatch system of surface finish, the symbols look like upside down triangles.
i am trying to convert it to microinches,micrometers or the "N" roughness grade numbers. i believe 3 triangles = 32 microinch finish. a chart would be helpful

 

[schlebb]

Triangles give a rather broad range of surface finishes. Their equivalents are as follows:

1 Triangle = 500 m inch = N10=12.5 m meters
= 250 m inch = N9 = 6.3 m meters
2 Triangles= 125 m inch = N8 = 3.2 m meters
= 63 m inch = N7 = 1.6 m meters
3 Triangles= 32 m inch = N6 = 0.8 m meters
= 16 m inch = N5 = 0.4 m meters
= 8 m inch = N4 = 0.2 m meters
4 Triangles= 4 m inch = N3 = 0.1 m meters
= 2 m inch = N2 = 0.05 m meters
= 1 m inch = N1 = 0.025 m meters

Each Triangle encompasses a range of surface finishes. Two triangles are used to denote a surface finish from 125 micro inches to anything over 32 micro inches.

 

[hodgey]

Can someone assist me in in identifying the finish required by a single triangle and the symbol Rz25

 

[RandallH]

Rz25 means the specifies the mean surface finish is 25 m meters, or 1000 m inch.