GOOD
-----Original Message-----
From: Brian Ellis [mailto:[log in to unmask]]
Sent: Thursday, July 01, 2004 2:21 AM
To: [log in to unmask]
Subject: Re: [TN] solder mask
Well, as you have taken my name in vain, don't be surprised to see
dewetting on such abraded areas. I would suggest that you use a fairly
coarse ink rubber (oops! Sorry, eraser for you US guys!!!!) to get
through most of the coating but finish off with the very finest pencil
rubber (ditto) with absolutely minimal pressure. The problem is that
some kind of gritty stuff is added to the rubber; this will become
literally embedded in the metal, causing dewetting. Don't believe me?
Well try it on a scrap of clean rolled copper foil and then flux it and
dip for a few seconds in a solder pot. Then you'll believe me.
By the way, the word used for the natural non- or semi-vulcanised latex
was originally caoutchouc derived from the Quechec word for the sap of
the hevea tree after smoking. The first major use of it was rubbing out
pencil script, so it was almost natural for the tool, called a rubber,
extended its name to the elastomeric material from which it was made,
because it was much easier to say than caoutchouc. For some peculiar
reason, possibly because of our friend Noah Webster who did his
damnedest to bugger up the English language, in the US, the tool became
known as an eraser, while very illogically keeping the word rubber for
the material. Later on, a different tool was made from the latex, which
the US baptised a rubber (designed to erase women?). I'm not sure
whether it was named thus because of the material or because of the
reciprocating motion in use causing friction. However, I am surely not
alone, as a user of the real English language, in having asked a
visitees PA in the USA whether she had a rubber (naturally to rub out
something I was writing).
Incidentally, in the US, I frequently came across the word
'condominium'. I decided it must mean a building containing a number of
apartments for housing bachelors wont to entertain unmarried ladies. So
named after the bulk of the materials in the trash cans. Is this right?
Brian
Whittaker, Dewey (AZ75) wrote:
> -----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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>>for additional information, or contact Keach Sasamori at [log in to unmask] or
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