Homebrew PCBs

Simple and effective...I love it!

On Mon, May 3, 2010 at 7:04 PM, bownes <bownes@...> wrote:

>
>
>
> I have had great luck using fine point sharpies stuck into home made
> adaptors and plotting directly onto FR4 with a slightly modified HP 7475
> plotter. (modified to allow the use of full height pens)
>
>
> --- In Homebrew_PCBs@yahoogroups.com <Homebrew_PCBs%40yahoogroups.com>,
> Andrew Villeneuve <andrewmv@...> wrote:
> >
> > This is actually exactly what I was using the first time around with
> > terrible results.
> >
> > I've done a little experimentation, and gotten the industrial fine-point
> > sharpie pens to work perfectly - they seem to resist as well as the
> toner.
> >
> > I found I was making two mistakes:
> >
> > 1) As has been pointed out by just about everybody on the list, I was
> > marking too lightly. Even a slightly darker line makes a significant
> > difference. I've gotten in the habit to retracing all my resist lines
> after
> > the ink dries - it doesn't take more than a few seconds.
> >
> > 2) I was originally etching using the "tankless" method of putting a few
> > tablespoons of room-temperature FeCL on a sponge and rubbing the copper
> off
> > the board. This actually does work as advertised, but ONLY ON TONER - the
> > friction rubs every bit of resist ink off the board well before the
> etching
> > is complete.
> >
> > It's also remarkably tedious and time consuming - I don't believe this
> > method is worth the trouble.
> >
> > Using a simple hand-agitated etching tank, I couldn't tell the difference
> > between sharpie-resist and toner-resist.
> >
> > -Andrew
> >
> > On Wed, Apr 28, 2010 at 2:43 PM, Dave Bobb <dave.bobb@...> wrote:
> >
> > >
> > >
> > > Yes, the ones we use at work are "red" label black sharpies. Ore
> > > specifically, industrial acid resistant. It takes forever to scrub
> > > these off with 91% alcohol.
> > >
> > > Sent from my iPhone
> > >
> > > On Apr 28, 2010, at 10:21 AM, "Tony Smith" <ajsmith@...<ajsmith%
> 40beagle.com.au>>
>
> > >
> > > wrote:
> > >
> > >
> > > > > Has anybody had lucks using Sharpies as resist-ink? Are there any
> > > > > recommendations on something better?
> > > >
> > > > I think it's the red ones that work.
> > > >
> > > > Tony
> > > >
> > > >
> > >
> >
> >
> > [Non-text portions of this message have been removed]
> >
>
>  
>


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