Peter,
DynaArt also makes a very good transfer paper.

You asked about lining up double sided boards. Here is the
method that *I* use. On the original artwork I include
registration pads at THREE extreme diagonal points. The pads
are made a decent size, but the hole is made very small.

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These are included for both the top and bottom pcb layouts,
and they must match exactly.

I run off the top and bottom pcb layouts on transfer paper,
and I also run off a copy of the top layout on plain paper.
I stick a needle into each registration pad hole on the plain
paper copy, and then tape the paper to one side of the pcb.
Because this is a double-sided design it really doesn't matter
which way you have the paper copy facing, because the use of
only three holes makes the top and bottom sides simply oppositely
asymmetric. It is usually most convenient to tape the paper copy
with the design showing. Tape all four sides. Use the smallest
drill bit you can find, and drill the three registration holes.
Remove the tape and the paper copy. Vigorously clean both sides
of the board. Thoroughly dry. You will now need three needles or
thin pieces of wire. Pierce all three registration holes on
BOTH pcb transfer papers. Apply the needles through the pierced
holes of one transfer sheet and attach that sheet to the pcb
by placing the needles through the appropriate holes. Flip
the board over and line the other transfer sheet with the needles
and push the sheet down so it is flat against the pcb.

Now apply Scotch 3M tape along the edges. Remove the needles.
Apply heat to transfer design. Remove transfer paper as usual.
When etching, ensure that both sides get equal etching treatment.

Fr. Tom McGahee

----- Original Message -----
From: Peter May <manager@SALE-NET.COM.AU>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Saturday, October 13, 2001 8:26 PM
Subject: [OT]: PCB Transfer paper


> Hi all.
>
>
> When doing the photographic method for a double sided I used to put the 2
> sheets together and tape 3 sides to make an envelope and slip the PCB into
> the 4th side. I did this with the iron on stuff and although I haven't
> drilled the holes yet to finally conferm it does look pretty good. Does
> anyone have any other suggestions how to line up the 2 sides of this type
of
> tranfer?

> regards, Peter.
>

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