Homebrew PCBs

What's really scarey is that I used to work on the old Nike Hercules
surface to air missiles. Their guidance systems had circuit boards that
all used eyelets. Can you imagine a missile going 2000 mph and an eyelet
giving out?
Rick

Steve wrote:

>  --- In Homebrew_PCBs@yahoogroups.com, "Rick C." <rixy@V...> wrote:
> > I explain this procedure on my website:
> > http://www.pic101.com/pcb/thru.htm
> > Rick
>
> As a technician, I can tell you that those rivets are indeed a
> terrible source of problems. They expand and contract and cause cracks
>
> in the solder, and when resoldering they must be completely sucked out
>
> and carefully resoldered so there are -no- bubbles. If even one bubble
>
> pops out, it makes a cold solder joint and must be redone.
>
> And it's almost impossible many times to find the cracks in the solder
>
> around them by visual inspection.
>
> Steve
>


[Non-text portions of this message have been removed]

Yep, but they only have to work once. ;') Plus I'll bet quality
control is a lot better than for consumer stuff.

A good mechanical connection is the first part of a good rocket-worthy
solder connection, that's probably why they used eyelets. However, I
think in consumer stuff it's just a convenience and they rely on the
solder to make the connection, because I've noticed many an eyelet
that was loose when desoldering it.

Steve

--- In Homebrew_PCBs@yahoogroups.com, "Rick C." <rixy@V...> wrote:

> What's really scarey is that I used to work on the old Nike Hercules
> surface to air missiles. Their guidance systems had circuit boards that
> all used eyelets. Can you imagine a missile going 2000 mph and an eyelet
> giving out?
> Rick
>