Franklin D Asbell wrote:

>I really makes sense considering the only use for silkscreen in these times
>are hand placement of components and perhaps rework or removal and repair of
>said components.
>
>I've talked to many CM's and OEM's who've stated they could care less about
>the symbolization only to the point it affects component placement.
>
>A show of hands now, who would be comfortable with removing symbol
>altogether? Pros of such action, Cons of such action?
>
>Franklin
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Whittaker, Dewey (AZ75)
>Sent: Tuesday, May 16, 2006 10:31 AM
>To: [log in to unmask]
>Subject: Re: [TN] Silkscreen on pads
>
>This is one of the reasons I don't allow silkscreen on my expensive
>printed wiring boards that have to be soldered. I get grief from
>everyone, but I never have to scrap a perfectly good functional printed
>wiring board, because of a poorly executed questionable at best
>manufacturing aid.
>Dewey
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
>Sent: Tuesday, May 16, 2006 5:55 AM
>To: [log in to unmask]
>Subject: Re: [TN] Silkscreen on pads
>
>It depends.
>If the artwork covers major parts of the pads critical to the strength
>of the solder joint, then it needs to be removed. If it is a situation
>where a very small amount of the epoxy overlaps onto the very edges of
>the pads, it may not be so critical. The boards are not any good if even
>one pad has an open.
>I know that removing the artwork epoxy can be extremely difficult.
>I would suggest the board vendor get on the stick and start a rework
>process for removing the epoxy. You should reach an agreement that any
>rework on your part is paid for by the board vendor.
>After the vendor provides you with 100 of the reworked pwbs, build them
>up and see how they solder before accepting any more.
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Black, Paul
>Sent: Tuesday, May 16, 2006 7:46 AM
>To: [log in to unmask]
>Subject: [TN] Silkscreen on pads
>
>Hi Fellow TechNetters,
>
>I am expecting a fabbed board for our first leadfree production build
>next month and have just been informed by the supplier that the artwork
>contained silkscreen on quite a few of the solderable SMT pads. They
>didn't catch it in time, so now they are asking is we could accept the
>boards (qty = 1000) this one time. My PCB spec does not allow silkscreen
>on any solderable surface, so I could reject the boards, but my concern
>is that there may not be enough time to have more boards fabricated in
>time for this build. I know that the boards wouldn't be acceptable per
>IPC-A-610, but does anyone have any experience with this situation and
>the best way to handle it?
>
>Thank you,
>Paul Black
>Manufacturing Engineer
>Kronos
>
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>
>
I'd love to, but there are still plenty of us who have to deal with hand
placements, and that's not going away anytime soon.

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