Interesting that you bring up old IR ovens and how this is
just like the first IR ovens. Anyone still using theirs? What
caused most users to stop using IR to begin with? Could these technology
be coming back, could grainy joints be the norm again?
I have seen and used both the Airvac and the Metcal
stations. The biggest issue I had with the Airvac is the nozzle
heights. Sure it was good enough for Surface Mount processing but forget
it if you were replacing a BGA from a test failure. The adjacent part
heights limited the use of the equipment in any rework/replacement situation
after surface mount. The Metcal is a good station vision system is easy to
use. Seems fairly user friendly. I think the board handler/rails
could be beefed up. Nozzles seem to have a bit more height to them for
later rework needs.
Also I wouldn't blame the operator for ripped pads and traces,
unless you have undisputable training evidence.
Most operators look for reflow or attempt to lift the part to
see if there is reflow. Get a machine that has the ability to store
programs and a vacuum pick up so the operators don't guess. I have done
large package rework for 15 + years, I have trained 30 some operators in rework
and always damage comes from the operator wondering if the part is ready or
not.
Kat