--------------------------------------------
On Mon, 1/25/16, 'Jeff Heiss' jeff.heiss@... [Homebrew_PCBs] <Homebrew_PCBs@yahoogroups.com> wrote:
Subject: RE: Vinyl mask, laser paint removal (was:Re: [Homebrew_PCBs] Plastic Resist From 3D Printer?) [1 Attachment]
To: Homebrew_PCBs@yahoogroups.com
Date: Monday, January 25, 2016, 8:48 PM
The laser I used was overkill, it was designed to cut metal. It was a frequency doubled Q-switched YAG laser of about 3W average and about 100 KW peak if I remember correctly, and cost around $10K. Paint removal should be fairly easy using anything from CO2 at 10.6 um to UV lasers. I think the simplest would be a diode laser in the blue or near UV. The shorter wavelengths should tend to ablate the paint rather than just burning it. If the laser is pulsed, then pulse rate can become an issue to avoid dotted lines.
Bob
The unknown question is what type of laser and what
power. This gentleman
is using a UV laser and documenting his progress.
http://gabuleu.blogspot.com/
From: Homebrew_PCBs@yahoogroups.com
[mailto:Homebrew_PCBs@yahoogroups.com]
Sent: Monday, January 25, 2016 10:40 PM
To: Homebrew_PCBs@yahoogroups.com
Subject: Vinyl mask, laser paint removal (was:Re:
[Homebrew_PCBs] Plastic
Resist From 3D Printer?)
On 1/25/2016 2:52 PM, Bob Butcher bbutcher85@...
[Homebrew_PCBs]
wrote:
>
>
> --------------------------------------------
> On Mon, 1/25/16, palciatore@... [Homebrew_PCBs]
> <Homebrew_PCBs@yahoogroups.com> wrote:
>
> Subject: [Homebrew_PCBs] Plastic Resist From 3D
Printer?
> To: Homebrew_PCBs@yahoogroups.com
> Date: Monday, January 25, 2016, 12:32 PM
>
> I think ;this could work if the resolution is good
enough. I have
> tried a variety of things for etch resist, from
electrical tape to
> spray paint and indelible marker ink. Most of these are
kind of
> difficult to apply where you want them, and only the
spray paint
> really worked well at preventing etching. One idea
someone came up
> with was using a CNC vinyl cutter to produce a pattern
that could be
> stuck on. Certainly worth a try!
>
> Bob
>
Hello--
Not knowing anything about the vinyl mask method of PC board
fabrication, I went looking and found an explanation on
Instructables:
http://www.instructables.com/id/Fast-and-Easy-PCB-Prototyping-with-Vinyl/
Reading down in the comment stream, I noted this: "...I
have tried the
laser ablation method and it works wonders.
I just cover my board with matt spray paint up to 3 coats
and then laser
etch away the color that
needs to be exposed as copper.
The success of this process [vinyl mask] is highly dependant
on a good
solid stickiness of vinyl to copper.
on straight planar surfaces, its never a problem, but its
worthwhile to
recheck that it has no bubbles.
vinyl is also stretchy when a little heat is applied, so
make sure you
don't squeege it too hard.
as an alternate, can we have the opposite parts weeded so
that tracks
are exposed, then spray
paint as a stencil, remove the vinyl and then
etch?...." (comment by
rupin.chheda)
One thing that's unclear (and likely hardware-dependent)
is the minimum
trace width and pad spacing
capability of this method for consistent results. Based on
example
photos, DIP layouts seem feasible.
Has anyone in the group tried this method?
73--
Brad AA1IP
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