circular finish requirement

[johnmoore]

Can someone define "circular finish" I have a customer drawing requiring a 16 finish or 32c.

thanks

 

[FACS]

Approximately circular relative to the centre of the surface to which the symbol is applied.

It's the machining marks, they have to be circular; much like a lathe operation would leave on a surfaced part.

http://www.misumiusa.com/press/docs/pr1167_1168Surfaceroughness.pdf

Charlie

http://www.facsco.com

 

[midden1]

how do you check a 32 circular finish
across the grain or with direction of circular finish
how would you check the depth of variation and how much
depth could you have,i figured .00032 depth

 

[btrueblood]

You check across the grain, or in the direction which will give the maximum deviation (surface finish requirements are default "max" allowable, unless two are specified (upper and lower limits).

A 32 is 32 micro-inches rms. You sweep a (usually) electronically-amplified stylus across a 1-inch swath of the surface, and take an rms (root-mean-square) average of the reading. Alternatively, purchase a visual comparison standard.