Agreed that they should be masked with a wide tolerance on acceptability.

IE minor  over spray or incursions on an edge should be a process indicator, not a defect.

Rich  Kraszewski 
Senior Staff Process Engineer
Phone: (920) 969-6075

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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of lduso - Diamond-MT.com
Sent: Thursday, January 10, 2019 4:15 PM
To: [log in to unmask]
Subject: Re: [TN] Conformal Coating and Unplated Mounting Holes

[EXTERNAL] This email was sent from outside of Plexus.  Use caution when opening attachments or links from unknown senders.
.
The most common method is to call them out to be masked but with no dimensions so we go with 1/4" or 5/16". Often, when I ask if a dimension is needed, they say to just ensure the bore is free. Next most common would be specific dimensional masking. I often get this from aerospace customers.
The "newbies" to coating will often call out an exotic dimension that cannot be masked with a common sized, easily available tape-dot. Which substantially adds cost to have them custom cut. Functionally, if nothing metallic will be exposed, it doesn't matter how big it is.

Lloyd Duso
Diamond-MT
(814) 535-3505
www.Diamond-mt.com


On Thu, Jan 10, 2019 at 4:36 PM Jack Olson <[log in to unmask]> wrote:

> Is it more common to conformal coat unplated mounting holes?
> or designate a clearance diameter on the assembly drawing?
>