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From: "Shaun Davy"
References: <6nMV9.26186$jM5.firstname.lastname@example.org> <3E27A064.email@example.com>
Subject: Re: Making 2 Layer PCB's
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Date: Fri, 17 Jan 2003 17:51:19 +1100
NNTP-Posting-Date: Fri, 17 Jan 2003 17:41:13 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
Sorry forgot to state (assumed didn't make any difference to be honest) that
i will be just using double sided copper board.
I Have a CNC controlled machine that can cut vinyl that i will stick to
board then etch with suitable solution that doesn't chew the vinyl. tried it
before and was sucessful and looked good.
But i think u answered my question anyways. So i just need to get a hold of
and use "Feedthru Pads".
Any ideas where i would get them from. I am in Australia and have never seen
that sort of thing at Dick Smith.
Thanks for the advice
"Tom Woodrow" wrote in message
> Made em at home, made em at work. Used kepro pre-reststed copper clad
> FR4 (double sided) laminate, a circuline forescent light for exposure,
> and a ceramic bowl crock pot for etching.
> Cleaned the resist off after etching with a freon degreaser. It worked
> but it was an environmental nightmare.
> Layout the board so that components can soldered on both sides of the
> board whet a feedthru is necessary.
> Use accessable feedthru pads where you can solder a jumper wire from one
> side to the other (use this instead of a plated thru hole)
> If you need the place a feedthru jumper under a component, solder the
> feedthru jumper in BEFORE you install the component.
> As for allignment top to bottom when etching, place unsed pads at
> opposite corners (or on all four corners if you like) of your layout.
> Drill these holes BFFORE you expose the double sided copper laminate.
> Allign your film on one side then drill the corner holes, then expose
> that side. To expose the second side allign your film on the backside
> using the same corner holes. The smaller the holes, and the more
> accurtely they they are centered in the pads on the file, the more
> accurate the side to side allignment will be.
> All the above is in the saaumption you are using photoresist board
> material (kepro or such).
> Good luck
> Tom Woodrow
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