Homebrew_PCBs

--- In Homebrew_PCBs@yahoogroups.com, "Marty Grove" <MartyGrove@c...>
wrote:

> This is a good question. I hadn't thought of this while considering the
> possibilities of building boards at home. Although I rarely got

involved

> with the solder masking of boards. I generally worked around the wet
> processing steps. developing, etching, & stripping, and chemical /
> mechanical cleaning, the processes that I am aware of are liquid

solder mask

> (typically applied by screen printing) and dry film solder mask. Both
> methods require special equipment; not something I would think would

fall

> into the "homebrew" category.

In a small semiconductor research lab in which I work, we regularly
apply photoresist to silicon wafers using a spinner. Is there some
reason such a process, using a clamped PCB board and a
servo-controlled motor, couldn't work for applying liquid photoresist
to copper-clad boards, as well? Seems to me almost a homebrew solution.

Jonathan