Many machines have a video split image where a camera and a mirror are
used to see the bottom of the BGA and the footprint on the board for
alignment. Our SMT vendor uses a SRT rework station...

Hope this helps...

-Shawn Utz

Hope Lariosa wrote:
>
> Hello out there!
>
> Has anyone had any experience placing BGA parts by hand?  I've been told
> there has been mention of purchasing an automatic pick and place machine
> for our in-house assembly shop but for now we have been manually placing
> SMD parts by hand and using a reflow oven.  Obviously, there are issues
> with BGA's, mainly, how do you know you've placed the part correctly?
> Other than the silkscreen outline, it's pretty much a blind guesstimate.
>
> Any input would be greatly appreciated.
>
> Hope Lariosa
> NASA Dryden Flight Research Center
> Phone (661)258-3663
> Fax     (661)258-2842
> [log in to unmask]