Proper Masking Notes

[mechman67]

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.

 

[ewh]

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.

"Good to know you got shoes to wear when you find the floor." - [small]Robert Hunter[/small]

 

[KENAT]

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,

Have you reminded yourself of faq731-376 recently, or taken a look at posting policies:

http://eng-tips.com/market.cfm?

 

[ctopher]

I agree with ewh and KENAT.

Chris
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