I have tried painting the pcb with different types of paint and burning off
with a laser, the results are OK, fine lines dont etch well, the burnt off
paint leaves a transparent residue that needs a good scrubbing with a
cleaning agent to remove which affects the painted areas. I prefer the blue
paper more than any other process, Couple of bucks per sheet and works all
the time.
Kim
----- Original Message -----
From: "Juan EA7FNJ" <ea7fnj@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Monday, January 19, 2009 10:45 AM
Subject: [Homebrew_PCBs] Re: Burning Laser CNC
> Yes, that's right.
>
> That is my idea: use the DVD laser to expose or burn the resist off. I
> don't know if I paint with some black ink a copper board and try to
> get off the ink burning it with the laser.
>
> A CO2 laser is very expensive for a student hi hi
>
> --- In Homebrew_PCBs@yahoogroups.com, Steve Wiseman <sjwiseman@...> wrote:
>>
>> I think Juan's contemplating burning the resist off, rather than
> exposing it.
>> I've got a 25W CO2 laser marker, (google synrad fenix) but no etching
>> gear here. If anyone wants to send me a bit of photoresist board, I'll
>> blast a few test images onto it at varying powers and send it back to
>> you for etching. Working area is credit card size, spot size is 180uM.
>> It'll almost certainly burn away the etch resist - but I don't know if
>> it will do odd thermal stuff to the remaining areas, and what the
>> effective resolution will be. It'll definitely not burn the copper,
>> with a puny 25W.
>>
>> ('Here' is Cambridge, England)
>>
>> Steve
>>
>
>