Homebrew PCBs

why didn't you use the 'oops' process of removing the
cuasi-failed process and start over?
magazine paper shouldn't be too expensive to discard....
why did you insist in rubbing and etching something you
knew beforehand was less than good?

--- Jim Reed <jsreed@...> wrote:

> I was discussing using a household clothes iron to apply
> toner resist
> with a friend of mine, and discovered he had a heat press
> - the kind
> that puts iron on transfer designs on T shirts.  Since I
> was very
> unhappy with the household iron technique, I took him up
> on his offer
> of trying it out on his press.  We preheated the press to
> 300 Degrees
> Farhenheit, and placed the circuit board and magazine
> paper in the
> press between 2 pieces of printer paper.  We got to
> talking about
> other things, and wound up leaving it in the press for 6
> minutes.  
> The design transferred real well, but it also had
> penetrated the
> magazine's paper.  As a result, I had to soak the paper
> for over a
> half hour, and even then some of the toner was rubbed off
> with the
> paper, and  I couldn't rub some of the paper off of the
> toner.  
> It etched real well.  I had a plastic tub about an inch
> shorter than
> the board, so I put a small amount of etchant in the
> bottom of the tub
> and used a natural bristle brush to "brush on" etchant at
> the highest
> point of the board.
> If I had it to do over again, I would try 2 or 3 minutes
> in the press
> maximum.  I feel the toner wound up spreading out some
> and losing
> resolution when I left it in too long.  It's still
> perfectly usable,
> just not as pretty as it could be.



       
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