Stencil data is output as part of the Gerber data that defines the PCB
itself. You will additionally need to specify the stencil thickness (or
thicknesses if you need a stepped stencil), whether you want it made by
etching or laser cutting, what side angles you want on the apertures as a
lead in to minimise solder paste sticking in the stencil, and maybe a
stencil number and revision to be etched onto its surface.

To control it, you add a note to your assembly drawing to state the stencil
number and revision to be used to screen paste onto the board.

Supplying an artwork won't do, as it's imprecise as far as accurate data is
concerned  (subject to physical damage, expansion/contraction, etc) and
it's non-modifiable without a replacement artwork. Gerber data is what's
required.

Can't recommend a stencil manufacturer that's useful to you, as I'm in
Singapore. While we have quite a good one that our CM uses, it's maybe a
bit far away for you.

Peter




                    "McGlaughlin,
                    Jeffrey A"              To:     [log in to unmask]
                    <McGlaughlin@BAT        cc:     (bcc: DUNCAN Peter/Asst Prin Engr/ST
                    TELLE.ORG>              Aero/ST Group)
                    Sent by: TechNet        Subject:     [TN] Stencil Design and Documentation
                    <[log in to unmask]
                    >


                    02/21/02 09:29
                    PM
                    Please respond
                    to "TechNet
                    E-Mail Forum.";
                    Please respond
                    to "McGlaughlin,
                    Jeffrey A"






Technetters--
I need some information I hope you can supply:

1) What do I need to supply a stencil manufacturer to get a stencil made?
    Will a 1:1 artwork of the pads and an array drawing suffice?
2) How do I document that information? Stencil Drawing? Work sheet? Other?
3) How should I control it so that I meet ISO?
4) Any recommendations on stencil manufacturers?

As always TIA,

Jeffrey A. McGlaughlin CID
Sr. Designer
Battelle Memorial Institute
Columbus Ohio
[log in to unmask]

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