ansi 9standards0 code issues - surface finish

huangyhg

ansi surface finish
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
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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 (visitor)29 apr 02 3:20
can someone assist me in in identifying the finish required by a single triangle and the symbol rz25
randallh (visitor)30 apr 02 11:14
rz25 means the specifies the mean surface finish is 25 m meters, or 1000 m inch.