which tip has this pen?
which color has the ink?
maybe i really have to search this bottle of fe3cl... and then try
different inks.
The problem with using pens directly for me was that line with varies with
speed.
at the corners the pen slows down and the line with increases.
i didn'tlike this, the were small tears at both sides of each corner.
don't you have this problem with the resist pen?
st
On Sat, 20 Sep 2003 21:06:55 -0400, Don Perry <mojo@...> wrote:
> Here's what works for me, I use a HP 7475 pen plotter with a slot cut in
> the
> case. I use a GC #22-222 Etch Resist Ink Pen. 1/64 " tip. Its fitted
> into a
> drilled and honed out dried up HP pen. I have to keep etching fast. I
> heat Fe
> CL3 on my grill outside, in a oven dish. Wear glasses, gloves, and
> apron. I
> use a oven baster to spray the center of the project. The edges seem to
> eat
> off first and I keep the acid going to the board center. This is not a
> time to
> walk off and come back. I keep an eye on the board till it is complete.
> You
> can always put it back in, but once its eaten the copper away its done.
>
> Stefan Trethan wrote:
>
>> @Dave
>> thanks for the tip with laquer thinner for solving colophony resin.
>> i tried it and it is much better than alcohol.
>> The "laquer" is the same density / concentration in the whole jar, it
>> stays
>> good dissolved without stirring etc.
>> with alcohol it was always thicker at the bottom (with acetone too).
>> Dries quick and leaves a shiny coat.
>>
>> I actually tried it as a resin for etching (because the quality is much
>> better now).
>> The problem is the plotter pens i have (carbide tipped) don't leave a
>> thick
>> enough layer to resist HCl H2O2.
>> I will try repeated plotting and maybe try Fe3Cl which i have standing
>> around somewhere (Does it decay in a sealed Bottle?).
>>
>> But i applied it with a piece of wire and with a piece of a paper towel
>> "disposeable brush with needle-nose pliers handle).
>>
>> And this areas resisted the etching very well.
>> So i think the plotter pens simply make a too thin layer.
>>
>> any ideas? - would be great to solder the boards with resin layer and
>> also
>> protection against corrosion.
>>
>> st
>>
>>
>> Be sure to visit the group home and check for new Bookmarks and files:
>> http://groups.yahoo.com/group/Homebrew_PCBs
>>
>> To unsubscribe from this group, send an email to:
>> Homebrew_PCBs-unsubscribe@yahoogroups.com
>>
>>
>>
>> Your use of Yahoo! Groups is subject to
>> http://docs.yahoo.com/info/terms/
>
>
>
>
>
> Be sure to visit the group home and check for new Bookmarks and files:
> http://groups.yahoo.com/group/Homebrew_PCBs
>
> To unsubscribe from this group, send an email to:
> Homebrew_PCBs-unsubscribe@yahoogroups.com
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>