Homebrew_PCBs

----- Original Message -----
From: "Stefan Trethan" <stefan_trethan@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Friday, May 28, 2004 10:57 AM
Subject: [Homebrew_PCBs] component outline "silkscreen" with toner transfer
and smd reflow


>
> Hi,
>
> if i make a component outline print with toner transfer, and then i oven
> solder
> the other side of the board with smd comopnents, what would happen to the
> toner?
>
> Wouldn't it be harmed by the solder temperature?

It'll probably be OK, if it isn't in contact with anything. It might burn
given a high enough temperature, as it consists of a thermoplastic mixed
with carbon black. I'd try it on a scrap of PCB material using the soldering
temperature profile and see what happens.

Leon
--
Leon Heller, G1HSM
http://www.geocities.com/leon_heller

>
> It'll probably be OK, if it isn't in contact with anything. It might burn
> given a high enough temperature, as it consists of a thermoplastic mixed
> with carbon black. I'd try it on a scrap of PCB material using the
> soldering
> temperature profile and see what happens.
>
> Leon
> --
> Leon Heller, G1HSM
> http://www.geocities.com/leon_heller
>

On Friday, May 28, 2004, at 12:44 PM, Stefan Trethan wrote:

> Another breakthrough:
>
> You get a PERFECT component outline transfer if you clean the board
> with
> this abrasive-type kitchen cleaner.
> No clear laquer needed.
>
> It polishes away the ugly paper residue and gives a beautiful finish.
>
> I also discovered that surface cleaning and paper handling does not
> matter
> very much with toner transfer of the component outline.
> If you use doublesided boards the epoxy surface is nicely rough after
> removing the copper
> and it adheres very well.
>
> Aligning is a bit tricky, but i first place the component outline
> paper on
> the bottom
> of the pcb, where i can easily align it with the copper image.
> then i draw lines at the edges of the pcb, cut out the paper, place it
> on
> top
> and fuse.
> It does not cause bad results here if you touch the freshly printed
> image
> on the paper.
> much less critical...
>
> I'd say the looks are well worth the extra effort.
>
> Now let's hope the baking tomorrow will not ruin the beautiful
> component
> outline...
>
> ST
>
>
>
> Be sure to visit the group home and check for new Bookmarks and files:
> http://groups.yahoo.com/group/Homebrew_PCBs
> Yahoo! Groups Links
>
>
>
>
>

> If you're doing a single sided board, or you can plate your vias
> through,
> you can just print the component outline on paper, then use spray
> adhesive
> to glue it on the top side of the board. Use a needle to punch through
> the holes for component legs. You could also print on label stock and
> stick it on the board, but it's usually a little thicker (and tougher to
> punch the holes through) than paper.
>
> Of course high wattage (hot) devices will set the paper on fire, etc.
>
> Regards,
> JJ
>

> If you're doing a single sided board, or you can plate your vias
> through,
> you can just print the component outline on paper, then use spray
> adhesive
> to glue it on the top side of the board. Use a needle to punch through
> the holes for component legs. You could also print on label stock and
> stick it on the board, but it's usually a little thicker (and tougher to
> punch the holes through) than paper.

> Or use Tshirt transfers. It's clear, and easy to poke holes through.
> Looks a lot better than a chunk of paper.
>
> Steve