Barbara,
Ah, those were the good old days. The smell of the etchant and developing fluids. Bishop Graphics for laying out the traces. Film leads and Mylar drafting film. Save the rubylith for when you get a broken tail light. Gee, and I still have all my drafting equipment and slide rule.
Did you learn DOS to run your computer too?
Grin!
Phil
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Barbara Burcham
Sent: Wednesday, June 30, 2004 12:09 PM
To: [log in to unmask]
Subject: Re: [TN] Soldermask on PTH pad???
OK, I just have to jump on this eraser thing, because I just read an
email about how much times have changed.
If you ever did drafting work with a lead pencil and an electric eraser
(using a shield), you will understand what Dewey is actually refering
to. A gray number 4 ink eraser stick is not just your normal pencil
eraser. These are the grade we used for removing India Ink applied with
a Leroy Lettering instrument (anyone remember those?) onto velum. This
eraser would go right through the velum if you were not very careful. It
will also be ebrasive enough to go through soldermask. And it will not
take a week.
Your coffee will not even get cold.
How old am I?
At least old enough to have had a great working relationship with Bishop
Graphics and still have an old roll of rubylith in the closet. I can't
even sell that on Ebay.
Barbara J. Burcham, C.I.D.
Fairfield Industries, Inc
281-275-7687
[log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Franklin
Sent: Wednesday, June 30, 2004 10:47 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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