One of the nice things about the Ersa is that it doesn't require nozzles,
and a camera/monitor setup allows the operator to see when the balls reflow
(if you have one unobstructed view).

The reason that IR ovens failed is that they were sensitive to the
construction (color, composition, thickness) of the parts that they were
soldering. This resulted in uneven heating across the board. The rework
station is only dealing with one component at a time.

Thank you,
Paul Black
Manufacturing Engineer
Kronos Incorporated
E-mail: [log in to unmask]
Voice: (978) 947-1520
Fax: (978) 244-0568
www.kronos.com
Improving the Performance of People and Business(tm)



-----Original Message-----
From: Kathy Kuhlow [mailto:[log in to unmask]]
Sent: Tuesday, January 07, 2003 5:51 PM
To: [log in to unmask]
Subject: Re: [TN] Rework Station


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

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