🚀 go-pugleaf

In article <eu04c5pmue08jv4u6ch5emu4tp5on63vbh@4ax.com>,
 Archimedes' Lever <OneBigLever@InfiniteSeries.Org> wrote:

> On Mon, 28 Sep 2009 22:38:31 -0700, Smitty Two <prestwhich@earthlink.net>
> wrote:
> 
> >In article <kk62c51rq1rhdq9he33du6t99nbjp1pqga@4ax.com>,
> > Archimedes' Lever <OneBigLever@InfiniteSeries.Org> wrote:
> >
> >> On Mon, 28 Sep 2009 06:21:13 -0700, Smitty Two <prestwhich@earthlink.net>
> >> wrote:
> >> 
> >> >In article <r7l0c5l9457i2ug2u6143cp6pllirtrauu@4ax.com>,
> >> > Archimedes' Lever <OneBigLever@InfiniteSeries.Org> wrote:
> >> >
> >> >> >As far as temperature, I agree with you. I've never found a need to 
> >> >> >solder anything at less than 800F. Smaller parts just require shorter 
> >> >> >dwell time.
> >> >> 
> >> >>   This one is off the mark.  Perhaps you meant "at MORE than 800�F"
> >> >> That would certainly be an upper max for me, and it is quite easy to
> >> >> solder at much lower temperatures.  Well over a 100 degree differential,
> >> >> and that is significant.
> >> >
> >> >Pardon my ambiguity. What I meant to say was "anything other than 800F." 
> >> >That's the upper limit on most fixed-temperature tips, or adjustable 
> >> >irons.
> >> 
> >> 
> >>  Yes, and despite most folks cranking the damned things up that high,
> >> basic soldering operations (pre-RoHS) were NEVER meant to be performed at
> >> that high a temperature.  Even on big 0.092" stock with lots of Copper.
> >> In that case, one should pre-heat the whole assembly a couple hundred �F,
> >> which will insure that all the solder joints wet well and flow through
> >> properly.
> >
> >Uh-huh. I've personally hand soldered hundreds of thousands of joints at 
> >800F, and overseen the soldering of millions. Turning down the flame has 
> >only one result: It takes too damn long to build the board. It's sort of 
> >like the clock speed on a computer. It doesn't matter much if something 
> >takes 1 second instead of 1/10 second, but it makes a big difference if 
> >it takes an hour instead of 6 minutes. When I was a kid I built some 
> >Heathkit stuff and spent 30 seconds making every solder connection, 
> >because the iron was underpowered and I didn't know enough to know it.
> >Machine soldering is different, of course,
> 
>   The sinking capacity of a soldering iron has little to do with the
> temperature it sits at and claims to be maintaining.  The ability of the
> iron to keep a tip at a given temperature is what makes a good iron, and
> no, those shit dial types with 800� at the upper end of the dial are NOT
> good at maintaining a set point, and there is NO spec ANYWHERE that uses
> 800� as an iron tip temp far assembly, even by hand.
> 
>    And even at 650� or 700�, a good soldering tech can perform a good
> solder joint in the same amount of time with a proper iron that holds its
> set point properly.
> 
> > but for hand work, 800 is 
> >perfect for everything and anything.
> 
>   Proof that you do not really know anything about it.  So despite all
> the talk about dwell times, and claim of "oversight" of others, your
> decisions about ignoring the facts and standards the industry has known
> about for decades means that your credibility for actually knowing what
> is going on fell right through the floor.

Obviously you have the engineering mindset, while I have the practical, 
get-it-done mindset. Even NASA gave up their low-temperature bullshit 
when they figured out that components are subjected to *less* thermal 
stress with high temps and short dwell times. Sure I know the difference 
between power and temp, but as far as production soldering, a lack of 
either has the identical result, and that's a lack of production, which 
translates to a lack of income, which translates to going out of 
business for a job shop. Many industries are, or were, profitable enough 
to have people working along at a snail's pace, but contract 
manufacturing doesn't have that false luxury.

How long does it take you to solder a standard thru-hole 14 pin DIP IC 
at 650? Anything more than about 1 second per leg, and you'd be fired 
from *my* production line. The same IC in a surface mount package, and 
you'd be expected to skate down each side and make seven perfect solder 
joints in a total of about 2 seconds, once the IC was tacked at opposite 
corners and fluxed.

I'll make the implicit explicit here, and let you have the last word. 
But it won't make you right.