[Open-graphics] Re: OGD1 pricing

[Richard Smith]

On 2/28/06, Timothy Miller <theosib at gmail.com> wrote:

> I've watched an experienced professional solder QFP's, and that was
> magic too.  The guy would tack down corner pins to hold the chip in
> place and then swipe the iron and solder down each side, relying on
> surface tension to avoid shorts.  I tried it and made a mess of shorts
> and opens.  There's some trick to how hot the iron is, how fast you
> sweep down the side of pins, etc.

Its not that hard.. Just a little practice and the right ammount of
flux.  Having a knife tip vs a round tip helps considerably.

Now these new "leadless" parts that are BGAs waanabees,  those are a
bitch.  Even our techs say they are hard.

For BGA rework though you have to use a rework station.   BGA's
actually solder up really nice.  The surface tension self centers the
part.  The cricital part is a nice clean screen of the solder paste.

--
Richard A. Smith