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February 2007

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Subject:
From:
Wayne Thayer <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Wayne Thayer <[log in to unmask]>
Date:
Thu, 22 Feb 2007 16:45:47 -0500
Content-Type:
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text/plain (163 lines)
I just checked my copy of IPC 600 and I couldn't find a spec for it.  I
suppose you could get to too small an area of copper to support the
component lead.  Might be able to find something for that in IPC 610,
but I didn't see that right away either.

Wayne

>>> [log in to unmask] 2/22/2007 4:12:31 pm >>>
I didn't think it would be a problem either. I was just trying to find
documented criteria for the inspectors to use for evaluation. Know of
any?
Dan

>>> [log in to unmask] 02/22/07 02:54PM >>>
That small a gap should be no problem--just visual.  The wave
soldering
process will have no trouble jumping that.

Wayne

>>> [log in to unmask] 2/22/2007 12:55:23 pm >>>
Wayne/Ian,
Thanks for the feed back. Yea.. apparently the panels had burrs from
drill  creating a gap between dryfilm and the copper surface allowing
etchant to attach copper around perimeter of hole. What I really was
wondering is whether there is acceptability criteria or are these all
scrap.The "gap" between the knee of the hole and copper is very minor
probably .001-.003. Any thoughts.
Dan 

>>> [log in to unmask] 02/22/07 11:44AM >>>
Dan-

Some board manufacturers do that deliberately to give the copper a
nice
etched finish on the inside edge of the pad for a single sided job. 
If
you drill through copper, it's common to have a bit of a burr left
over
there which you either need to remove or convince the customer to
accept.

This should have been specified when the board was CAM'd prior to
sending it out.  Since you apparently didn't specify, I'd expect about
a
3mil clearance there.  Getting tighter than that may raise the cost of
the board significantly.

Wayne Thayer

>>> [log in to unmask] 2/22/2007 11:40:47 am >>>
Good morning. Does anyone know of any acceptability criteria for "fish
eyes" or a thin void of copper around holes on single-sided boards? At
times there's a complete cirmcumfrential void and other instances
there's only a very small amount of copper missing. Thanks in advance
for any assistance!
Dan


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