Hi John,
On Mon, Jul 28, 2014 at 10:01 AM,
hudakjm@... [Homebrew_PCBs]
<
Homebrew_PCBs@yahoogroups.com> wrote:
>
> I was looking at some commercially produced patterns and they seem to frequently employ fillets. This is I presume to prevent cutting in of the pattern at 90 degree corners when the board is etched.
I reckon use of fillets to prevent overetch in the corners is a
historical thing. These days it's mostly done for aesthetics. I
supply thousands of PCBs a month commercially, and filletless right
angles are not a problem at all.
It may still be relevant for home etching though, where timing and
process chemicals are not controlled as strictly as in commercial
production. I suggest making a test board that you can use to explore
how well the home etch process works for you. All the best!
Mitch
http://www.hackvana.com/guide