I hate to state the obvious, but incoming inspection compares the board the vendor delivers with the requirements for acceptability which are documented in your drill drawing. If you document it thoroughly, they will thoroughly inspect it to your requirements. If you don't they won't have much to inspect.
What I advise all designers to do it look at your notes very carefully... are the things you are requiring of the vendor reasonable? Many folks cut and paste notes or boilerplate them for a design without looking at them critically and trying to make sure that they make complete sense. For example, how do you dimension your board? Some designers I have known just randomly picked features on the board and attached dimensions to them... not with any real rhyme or reason... My experience is that receiving inspection reads your fabrication document and if you dimension something, they attempt to verify it. If you fail to dimension a critical feature... nobody is going to look at it. Are the sizes of holes reasonable? Some of the most common mistakes I see are related to not sizing holes with bare board manufacturing and assembly in mind. Many vendors put the smallest size possible on their datasheets... check the tolerances on your drawing, will the part still be solderable and insertable if someone has reworked the board? Clearance holes for fasteners... spacing from the edge of the board, forgetting to add fiducials, the list goes on...
If you call out IPC-600 on your fab drawing, they will need to check it conforms to that spec... that's a wise thing to do... the standards are there for all of us. Manufacturers and well as designers... You control how it gets inspected by how well you document the design.
:)
William Brooks, CID+
Senior MTS (Contract)
2747 Loker Ave West
Carlsbad, CA 92010-6603
760-930-7212
Fax: 760.918.8332
Mobile: 760.216.0170
E-mail: [log in to unmask]
-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of James Jackson
Sent: Monday, June 03, 2013 10:48 AM
To: [log in to unmask]
Subject: Re: [DC] Exposed edge copper - internal planes
William,
This is exactly what I was looking for. I don't know how I missed finding it - it's as plain as day - once I looked it up.
Thanks!!
Now... how does incoming inspection deal with this? IPC-600, I suppose...
Regards,
James Jackson
Oztronics
Quoting "Brooks, William" <[log in to unmask]>:
> IPC 2222 10.1.1 Edge Spacing - sets the requirement for MINIMUM edge
> spacing for conductors or spacing from non plated thru holes.
> It's a formula... .4mm (.016 in.) plus the required minimum voltage
> spacing requirements... you find those requirements by voltage range
> in IPC-2221 table 6-1.
>
> Rule of thumb for low voltage lines is about 20 to 25 mils for good
> laminating and some in there for process tolerances... Some folks go
> closer... but it can bite you if you aren't careful. Remember tolerances...
> never, I repeat... never design to the minimums if you want to be
> successful. :)
>
>
>
>
> William Brooks, CID+
> Senior MTS (Contract)
> 2747 Loker Ave West
> Carlsbad, CA 92010-6603
> 760-930-7212
> Fax: 760.918.8332
> Mobile: 760.216.0170
> E-mail: [log in to unmask]
>
>
>
> -----Original Message-----
> From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of
> James Jackson
> Sent: Monday, June 03, 2013 10:07 AM
> To: [log in to unmask]
> Subject: [DC] Exposed edge copper - internal planes
>
> Is there an IPC callout for exposed edge copper?
>
> I seem to remember it not being allowed, but cannot locate an actual
> statement in any of the IPC documentation.
>
> What I am referring to is when you have a negative copper plane (or
> copper
> pour) on an internal layer that extends to the edge of the PCB. When
> it gets fabricated, there would be a small line of internal copper for
> each of the planes that extend to the edge of the PCB - which could be
> shorted together, if a metal object were brought into contact with the
> exposed copper.
>
> Any thoughts?
>
> Regards,
>
> James Jackson
> Oztronics
>
>
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