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From: "Da Man"
References: <email@example.com> <firstname.lastname@example.org>
Subject: Re: Total lack of response re SMT query - What gives ?
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Date: Tue, 31 Dec 2002 23:47:43 GMT
NNTP-Posting-Date: Tue, 31 Dec 2002 19:47:43 AST
"andy" wrote in message
> email@example.com (Glen Walpert) wrote in message
> > In article <firstname.lastname@example.org>,
email@example.com (Gibbo) wrote:
> > I can't imagine using a soldering iron on *any* SMT compoment, now that
> > become proficient with hot air, although they are still required for pad
> > cleanup (with solder wick) prior to part replacement.
> > IR is on my list as the next method to try, but I haven't gotten round
> > yet. Fiber-optic IR should have 2 major advantages in that the heat
> > easier to deliver to a small spot and there is no tendency to blow small
> > off their pads, which can be a major problem with hot air (solved with
> > adhesive to hold parts in place).
> Just wait till you got to IR reflow, I guarentee you will not
> understand how you managed without it, and you'll also wonder why you
> ever thought hot-air was good!!!
> > Why does everyone hate your hot air system? You aren't trying to do hot
> > rework without preheat, are you? Proper preheat makes the process at
> > 10x easier; I skip it only if I am doing something extremely easy, like
> > replacing a single resistor spaced well away from other components.
> > preheat even small BGAs are no problem; without preheat BGAs are
> > There has actually been quite a bit of discussion of hot air SMT
> > here over the years, unfortunatly cluttered with a ton of "use a
> > iron" nonsense from the SMT newbies. If you can be specific about what
> > problems you are having with hot air perhaps we can offer some
> I've been reworking and prototyping with SMT since the begining, so I
> don't conseder myself to be a newbie. However, if i change only a
> couple of components, i'd rather use an iron than spend all that time
> setting up IR reflow machines. No preheating needed with an iron
> either. Obviously there is some exceptions such as BGA and TQFP's
TQFP's are a joke with a soldering iron. Large ones at that.
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