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January 2003

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Subject:
From:
Kathy Kuhlow <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 7 Jan 2003 16:50:52 -0600
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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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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; charset=iso-8859-1"> <META content="MSHTML 6.00.2715.400" name=GENERATOR></HEAD> <BODY style="MARGIN-TOP: 2px; FONT: 8pt MS Sans Serif; MARGIN-LEFT: 2px"> <DIV><FONT size=1>Interesting that you bring up old IR ovens and how this is just like the first IR ovens.&nbsp; Anyone still using theirs?&nbsp; What&nbsp; caused most users to stop using IR to begin with?&nbsp; Could these technology be coming back, could grainy joints be the norm again?&nbsp; </FONT></DIV> <DIV><FONT size=1></FONT>&nbsp;</DIV> <DIV><FONT size=1>I have seen and used both the Airvac and the Metcal stations.&nbsp; The biggest issue I had with the Airvac is the nozzle heights.&nbsp; Sure it was good enough for Surface Mount processing but forget it if you were replacing a BGA from a test failure.&nbsp; The adjacent part heights limited the use of the equipment in any rework/replacement situation after surface mount.&nbsp; The Metcal is a good station vision system is easy to use.&nbsp; Seems fairly user friendly.&nbsp; I think the board handler/rails could be beefed up.&nbsp; Nozzles seem to have a bit more height to them for later rework needs.&nbsp; </FONT></DIV> <DIV><FONT size=1></FONT>&nbsp;</DIV> <DIV><FONT size=1>Also I wouldn't blame the operator for ripped pads and traces, unless you have undisputable training evidence.&nbsp; </FONT></DIV> <DIV><FONT size=1></FONT>&nbsp;</DIV> <DIV><FONT size=1>Most operators look for reflow or attempt to lift the part to see if there is reflow.&nbsp; Get a machine that has the ability to store programs and a vacuum pick up so the operators don't guess.&nbsp; 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.&nbsp; </FONT></DIV> <DIV><FONT size=1></FONT>&nbsp;</DIV> <DIV><FONT size=1>Kat</FONT></DIV> <DIV><FONT size=1></FONT>&nbsp;</DIV></BODY></HTML> --------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------

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