ISO surface roughness symbol to and FG 1

[SeasonLee]

Please ref to the attached file for details. Per ISO 1302

It's a sphere ball surface, what's the meaning of "to" and "FG" as highlighted in the square, thanks for the help.

Season

 

[dgallup]

The "to" is where you should put the process such as grind or lap, I have no idea what "to" means. The "FG" is where you should put the sampling length. This should be a value 0.08, 0.25, 0.8 (default), 2.5, 8 or 25. Again, I have no idea what "FG" means.

Just a wild guess but maybe it is meant to mean something like "to Finish Grind". Sure does not look to be done to the ISO standard.

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The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.

 

[CheckerHater]

Is your drawing in Spanish by any chance?

The process could be something like "torneado" - turned.

Still drawing blank about FG

 

[SeasonLee]

I am not quite sure what language used on this print, can you read it?

Season

 

[CheckerHater]

Some words look like French.

We are getting somewhere. "FG" may refer to surface "function" per ISO 12085 which is supposedly based on French standard. (See picture)

I am not sure this will make your life any easier though :-(

 

[SeasonLee]

Thanks for the post and information, CH and dgallup

Season