Sorry if I mislead you, but I haven't used a mask yet. Just thought it's
the right way to go for large quantities. I don't have any information on
masking material.
To answer your other question, we purchased the CRR2000.
Jim Marsico
Senior Engineer
Production Engineering
EDO Electronics Systems Group
[log in to unmask] <mailto:[log in to unmask]>
631-595-5879
-----Original Message-----
From: Dehoyos, Ramon [SMTP:[log in to unmask]]
Sent: Thursday, June 05, 2003 7:52 AM
To: 'TechNet E-Mail Forum.'; 'Marsico, James'
Subject: RE: [TN] Urethane Coating Spot Removal...
James:
What kind of material did you use to make the masks and what
make of
CCR machine did you use?
Regards,
Ramon
> -----Original Message-----
> From: Marsico, James [SMTP:[log in to unmask]]
> Sent: Wednesday, June 04, 2003 2:51 PM
> To: [log in to unmask]
> Subject: Re: [TN] Urethane Coating Spot Removal...
>
> We've just put a CCR System on line and I like it much better than
> chemical
> striping, especially for spot removal. The ESD features are also
good.
> The
> best thing about spot removal on many assemblies is that you can
make a
> mask
> which exposes only the areas to be removed and blast away.
>
> Jim Marsico
> Senior Engineer
> Production Engineering
> EDO Electronics Systems Group
> [log in to unmask] <mailto:[log in to unmask]>
> 631-595-5879
>
>
> -----Original Message-----
> From: Steve Gregory [SMTP:[log in to unmask]]
> Sent: Wednesday, June 04, 2003 2:44 PM
> To: [log in to unmask]
> Subject: [TN] Urethane Coating Spot Removal...
>
> Hi All!
>
> First I would like to thank everyone for all the dialog
about ISO
> and Prototypes. There has been some extremely good discussion!
>
> My next subject has been talked about recently, but I
would like
> to
> get a little more detailed about some things.
>
> We are about to embark on a task up-grading a bunch of
assemblies
> (1200+) that have been coated with urethane conformal coating. The
> upgrades
> will consist of removing just a handfull of parts, and replacing
them,
> maybe
> adding a jumper wire or two, and replacing part number labels with
new rev
> ones. So we're going to spot remove and spot re-coat.
>
> The -7721 lists a preferred removal method order table,
and it
> lists
> Thermal as number 1, Grinding / Scraping number 2, Solvent number
3, and
> Micro Blasting number 3.
>
> I've searched the achives and picked-up a bit of info, and
there
> was
> a thread asking about what chemical to use removing urethanes from
plastic
> SMT parts. I also did a search of the 'NET for some info, which
prompts me
> to ask some questions.
>
> Why would Micro-blasting be listed as one of the least
desirable
> methods? I understand the ESD issue, but from what I learned in
looking at
> two companies that I found that make this equipment (Crystal Mark
and CCR
> Company), they address the ESD issues. Are their claims over
stated?
> There's
> a *.PDFdocument that CCR has up on the web, that makes for some
> interesting
> reading. Go to:
>
> http://www.ccrco.com/study.pdf
>
> In that document, they state that using a thermal method
is
> hazardous because the coating will produce toxic gases when burnt.
I
> called
> Conathane and they said that if it is overheated, there is some
cyanide
> given off. But I would think that only happens when you actually
burn and
> char the coating, true? I've been playing around with a hot air
pencil and
> a
> orange stick, and that works with no charring or burning, but
that's dead
> slow.
>
> I really don't want to use chemicals because it is so
messy and
> takes forever, and we're only going to be doing a handful of
places on
> each
> board.
>
> So what method would you use if you had 1200 boards
staring you in
> the face, with just a handfull of places on each board?
>
> -Steve Gregory-
>
> P.S. I'm looking into the possibilities of leasing a
> micro-blasting
> system, unless somebody says that's the worst thing I could do...
>
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