Hi Peter!

On Thu, 3 Apr 2003, Peter L. Peres wrote:

> My problem with pre-sensitized boards is a) price and b) the fact that
> the resist chips off if I try to cut them to shape before exposure. My
> boards are small and I can use a sheet of pre-sensitized for a long run
> of prototypes if I can cut it. But I cannot. So I use the spray.
>
> Peter

That 'long run of prototypes' is unclear.

Does it mean making a series of similar boards, with slight changes, until
a circuit ir right?

Or meaning making a bunch of boards all identical, but low volume enough
to not make sense to give to a board house?

If the former, then you're doing it right of course and can ignore the
next paragraph. :) I'd guess it's easier to get a uniform coating on a
small board, no more than one 'spray width,' rather than back-and-forth to
cover a larger board. Maybe that's why you get better results.

If the latter then you should be using a step/repeat technique with a
larger piece of film, larger board to start with, do all processing except
cutting into smaller boards which is the last step.

Have a :) day!

jb

--
jim barchuk
jb@jbarchuk.com

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