Surface Finish, Old Symbol
Surface Finish, Old Symbol
(OP)
We have a 1940's vintage drawing of a special bolt that calls for a surface finish with an old symbol; it looks like an integral sign and has a number after it - our symbol is f 4. I have a 1939 Machinery's Handbook that says f 1 is rough machined, f 2 is ordinary machining, up through f 5 for polished. f 4 is a ground surface, which makes sense for this bolt. Our client has another undocumented reference that has the numbers in reverse order, f 5 is rough and f 1 is polished. Can anyone shed some light on this finish symbol?





RE: Surface Finish, Old Symbol
http://www.predev.com/smg/specification.htm
RE: Surface Finish, Old Symbol
Woody Ebersold
Consulting Engineer
"AN EXPERT IS ALWAYS SOMEONE FROM OUT OF TOWN"