Ron,

Are your techs attempting it with a soldering iron or a thermal jet? 
Jetting is easist IMHO since you never touch the components with the hot 
jet and only heat what needs heating, if done correctly the part will 
self align.    Make sure you can adjust airflow to minimize side force 
on the components soft and hot is the way to do it.     I haven't tried 
stacked components but it works great on hair thin leads and SMT 
components.   We had Pace PRC-2000 repair stations where I worked and 
they had thermal jet units as part of the features.     I have also done 
it with stand alone units but it is a little harder, less control.

pat goodyear
PG&E control technician, retired.


On Wed, Jul 23, 2014 at 12:20 PM, Ron Feyereisen wrote:

> Hi Technetters,
>
> I'm looking for some sort of documented technique (if one exists) and 
> advice on hand soldering stacked SMT components.
> We're currently working on a production job that requires hand 
> soldering a 0603 resistor on top of an already reflowed capacitor of 
> the same size and we're experiencing some fallout with one side not 
> being completely connected at the top of the stack with a full fillet. 
> Inspection is having to inspect at 10x mag and it's slowing down 
> throughput.
>
> Any advice on improving our soldering techniques would be much 
> appreciated!
>
> Thanks,
>
> Ron
>
> Ron Feyereisen
> Continuous Improvement Mgr., CIT
>
>
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