【转帖】proper masking notes

yang686526

proper masking notes
does anyone know the proper method for noting an area to be masked from a coating on an enginering drawing?  i have a part that will be painted everywhere except for a bore and i cannot find how to note this in any of the asme y14 specs.  i am looking for a graphical method and not so much a text note, if it exists.  thank you.
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i've always approached it using a flag note, indicating to "apply paint per... unless otherwise indicated."  i would then add this flag to the bore dimension with the text "do not paint" or something to that effect.  i don't think the specs get that deep into the details for this type of situation, but someone else here may be able to direct us to the aplicable standard.
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i agree with ewh that i don't think the spec goes into this much detail.  i've seen combinations of hatching to indicate where, and a note to say what, or just a note.  i've never seen just a symbol.
i will say this much, you don't want to tell them what or how to mask.  you want to tell them what surface is to be free of the finish/coating.  it's a subtle difference much of the time but better complies with asme y14.5m-12994 1.4e.  also for some combinations of material/finish/process it can in fact be preferable to part machine the item, treat it & then finish machining the areas to be free of coating.  telling them what areas to mask theoretically precludes this.
in your case, i'd put a 'flag' next to the dimension for the bore to a note.  in the note i'd say something like "surface of hole to be free of coating".
  
kenat,
i agree with ewh and kenat.
chris
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