Happy to stay in touch Don and will report progress if and as I make some.
One technique I have used to overcome the translucency of negatives made on
a photocopier with OHP film was to print two, line them up carefully so as
to get a double layer on the traces and then expose the board through the
double negative. Worked well so long as the alignment was good.
I have been following the TTS threads here for a few months and am looking
out for an old copier or similar so I can try the fuser method of heating
the pcb and the toner image. That seems to be getting the best reviews.
Choice of paper is apparently important too for that method. Strongest tips
yet seem to be the use of pages from Airborne mag, at least here in VK, or
high quality ink jet paper.
73 Bill
----- Original Message -----
From: "Don Bradbury" <don282@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Wednesday, June 30, 2004 11:18 PM
Subject: Re: [Homebrew_PCBs] SCOTCH 8007
> Hi Bill, many thanks for the reply I think I am to basic with my needs for
most people on this board. I don't make enough boards these days to get to
the level of the others and I don't like the toner transfer system I find it
is to uncertain for what I need it for (10 GHz boards $1.45 sq.inch) but the
same situation exists here I have a number of sq ft. of negative board and I
don't know if it will still work either. I find that I can't get an opaque
enough negative from the computer either inkjet or laser so I am going back
to film am waiting for a supply coming in from Germany as Kodak and all of
the other manufacturers have stopped making lith film. RCS in Sydney are
supposed to have something that will work but I can't get Bob to answer
emails with details and there is a company in Perth with a version of 8007
but it is a stripping type of film and I doubt the accuracy and at $90 a
packet I'm not willing to risk it.
> Kalex have given up looking , I spoke to Jenny the other day and she had
heard no more .
> Ok sorry to beat you around Bill but I am getting frustrated and living in
the bush (Western Victoria) doesn't help.
> I would like to hear what you have found as alternatives seeing as we are
both in the same boat.
> All the best,
> Don....VK3YV
> ----- Original Message -----
> From: Bill Maxwell
> To: Homebrew_PCBs@yahoogroups.com
> Sent: Wednesday, June 30, 2004 6:28 PM
> Subject: Re: [Homebrew_PCBs] SCOTCH 8007
>
>
> G'day Don
>
> I am about two weeks behind in clearing e-mails but I note that you dont
> appear to have had a response as yet.
>
> I'm afraid I dont have good news for you, unless finding a fellow
sufferer
> is useful. We are both the victim of limited shelf-life of Scotch 8007.
In
> my case I have a full pacxket, less about two sheets, that I bought back
in
> about 1992.
>
> Nobody ever told me that it had a limited life and it certainly isn't
> mentioned in the literature that came with the box but that is the
simple
> truth, as I found out after checking with a couple of development labs
and
> finally Kalex (?) in Melbourne who used to be a major agent for the
stuff.
> They were trying to find an alternative reversing film but hadn't been
able
> to find anything that was comparable in price, when last I checked about
two
> years ago.
>
> I did suspect the developer at first but then I was given a huge supply
of
> that from a closed Govt lab. It contained a number of very different
batch
> numbers but none could develop the 8007. That was when I started to ask
> questions around the trade.
>
> I too have a considerable quantity of Ristron negative pcb material,
that
> may or may not still be ok. I have been meaning to make up a negative
> design on the computer and do a trial exposure to see what state of
health
> it is in but haven't gotten around to it. Hopefully it might be ok and
if
> so, I might be out of my jam as it is relatively easy to reverse
drawings on
> the pc to produce a negative - or at least it should be. I haven't
tried
> that either yet.
>
> Meanwhile, 3M has stopped making Scoth 8007 and Scotchcal, the panel
> material it was originally intended to be used with.
>
> Cheers
>
> Bill VK1MX & VK7MX
>
>
> ----- Original Message -----
> From: "don2822003" <don282@...>
> To: <Homebrew_PCBs@yahoogroups.com>
> Sent: Thursday, June 17, 2004 12:55 PM
> Subject: [Homebrew_PCBs] SCOTCH 8007
>
>
> > Hi all, I am new to this group and come recomended by the AMATEUR
> > REPAIRS group. I am in Australia and have a question. Can anyone help
> > me with the instructions for using 8007 reversal film. I have used it
> > a lot in the past but either my memory has failed me or the film I
> > have left or the developer have gone off. I can find no information
> > on the net at all. If it is the developer gone off is there any thing
> > else that will do the job. I have a quantity of negative acting
> > circuit board I wish to use and do not like the TTS system. Any other
> > Ideas would be most welcome as I only have 1 sheet of 8007 left.
> > many thanks ,
> > Don VK3YV.
> >
> >
> >
> >
> >
> > Be sure to visit the group home and check for new Bookmarks and files:
> > http://groups.yahoo.com/group/Homebrew_PCBs
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
>
>
>
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