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June 2004

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Subject:
From:
"Whittaker, Dewey (AZ75)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 30 Jun 2004 09:34:43 -0700
Content-Type:
text/plain
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-----Original Message-----
From: Whittaker, Dewey (AZ75)
Sent: Wednesday, June 30, 2004 9:02 AM
To: 'TechNet E-Mail Forum.'; 'Franklin'
Subject: RE: [TN] Soldermask on PTH pad???


You didn't read what I said. It works. To defend the method with the same
level of detail that Brian could, would cause you more "pun"ishment than
it's worth.
Dewey

-----Original Message-----
From: Franklin [mailto:[log in to unmask]]
Sent: Wednesday, June 30, 2004 8:47 AM
To: [log in to unmask]
Subject: Re: [TN] Soldermask on PTH pad???


Sit down at your desk with a scrap board and a pencil eraser...start
erasing...email us when you've reached copper and/or glass...talk with you
in a week...

Franklin


----- Original Message -----
From: <[log in to unmask]>
To: <[log in to unmask]>; <[log in to unmask]>
Sent: Wednesday, June 30, 2004 10:00 AM
Subject: RE: [TN] Soldermask on PTH pad???


hi,

why would that be?  the eraser is acting as an abrasive wearing its way
through the mask (or conformal coat for that matter) down to the foil.  it
sounds like a clever idea to me.  i think you'd want to check and make sure
that no esd is generated if the board is populated.  if the board isn't
populated then who cares?

phil

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Franklin
Sent: Wednesday, June 30, 2004 6:59 AM
To: [log in to unmask]
Subject: Re: [TN] Soldermask on PTH pad???


Interesting, I'm thinking if an eraser can remove solder mask from copper
then that solder mask was not applied correctly...hmmmmmm

Franklin


----- Original Message -----
From: "Whittaker, Dewey (AZ75)" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, June 30, 2004 8:48 AM
Subject: Re: [TN] Soldermask on PTH pad???


> I know this is going to rub a few people the wrong way and it will for
> eberhard for me to be taken seriously again, given my abrasive nature, but
> masking my inhibitions I will tell about a process I have used.
> Take an electric erasure with a gray number 4 ink erasure in it and using
an
> erasure shield match the opening in the shield to the area you want to
> remove the mask. With technique you can just remove the mask and leave the
> area shiny that you want to solder. A little IPA to clean the area, the
> right flux of choice and you have a good solder connection.
> Logic will dictate your process, but it is very quick and easy. We have
went
> through Qual test with this.
> Dewey
>
> -----Original Message-----
> From: Franklin [mailto:[log in to unmask]]
> Sent: Wednesday, June 30, 2004 5:25 AM
> To: [log in to unmask]
> Subject: Re: [TN] Soldermask on PTH pad???
>
>
> Short of very expensive laser strip processes a razor knive and
lots-o-labor
> are about the only way...chemicals and other type methods are only messy
and
> cause other problems...
>
> Franklin
>
>
> ----- Original Message -----
> From: "Ken Patel" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Tuesday, June 29, 2004 6:41 PM
> Subject: [TN] Soldermask on PTH pad???
>
>
> > Technetters,
> >
> > We have pads of hand soldering locations covered with solder mask making
> it
> > difficult to solder. Is there any other way to solder besides scarping
the
> > solder mask (abrasive) and use solder fountain? I am looking for any
easy
> > way to remove solder mask or soldering technique.
> >
> >
> >
> > Any help will be highly appreciated.
> >
> >
> >
> > Re,
> >
> > Ken Patel
> >
> >
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