Unfortunately, Mountain Dewey may have a slightly cynical way of expressing it, but he is 1000% right, in essence. Commonsense no longer prevails. How many time have you seen messages here like "Is there an IPC standard on how I should hold my willy while urinating?" or "Is a mil the same as a mile and a millimetre" or "I'm wave soldering, which flux should I use?" or "Is a short circuit between two tracks a no-no?" However, he was wrong in one respect, it was Aldous Huxley who predicted psychological conditioning in technological spheres when he wrote Brave New World, the same year as when I was born (no connection). Adolph H. wrote Mein Kampf. Brian Ahne Oosterhof wrote: > Ouch, empty a whole bottle of Mountain Dew, and pry that tongue out of the > cheek. > Ahne. > > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Whittaker, Dewey (AZ75) > Sent: Thursday, September 16, 2004 8:42 > To: [log in to unmask] > Subject: Re: [TN] (2)PWB Conductive Contamination Under Solder Mask; What > Can ... > > In a former life(last week), I would have responded to the question of what > are the younger people going to do when the older knowledgeable people are > gone( passed on to that big TechNet in the sky, which we are just dying to > get in to) by saying it would probably lead to a lot of "spirited" debates. > In reality these days of 6 Sigma, Black belts, cross-functional teaming and > integrated supply chain mentality, it is no longer a requirement to have > technically competent people, because it is not important to have the > intuitive right answer. It is only important that everyone has agreed to the > same answer. The right answer may not be cost-effective or would require too > much technical support or understanding and that's not a path they want to > go down. If after 6 months the problem still exists, the Corporate mind-set > of Globalization and strategic initiatives will deem the problem and it's > associated activities as not one of it's core competencies and pursue > off-loading or outsourcing it. > Adolph Huxley was right. > Dewey > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]]On Behalf Of Mike Fenner > Sent: Wednesday, September 15, 2004 6:39 AM > To: [log in to unmask] > Subject: Re: [TN] (2)PWB Conductive Contamination Under Solder Mask; What > Can ... > > > Same as us: The young folks will be surprised to find they are now the old > folks and wishing they'd paid more attention ? > > Regards > > Mike > > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of - Bogert > Sent: Wednesday, September 15, 2004 10:39 AM > To: [log in to unmask] > Subject: Re: [TN] (2)PWB Conductive Contamination Under Solder Mask; What > Can ... > > > September 15, 2004 > > Thanks for the information and history lesson. What happens in the world > when all of us old folks are no longer here? > > PS can you give me details on your book and where to purchase it? Thanks > ----- Original Message ----- > From: Brian Ellis<mailto:[log in to unmask]> > To: [log in to unmask]<mailto:[log in to unmask]> > Sent: Tuesday, September 14, 2004 1:55 AM > Subject: Re: [TN] (2)PWB Conductive Contamination Under Solder Mask; What > Can ... > > > You must be aware that using abrasive brushing (Scotchbrite (R) or > slurry) is a major cause of solder dewetting. Micro-particles of > abrasive get implanted in the metal, which is even swaged over some of > them. I have PROVED this time and time again. I published this in a > paper 'New Aspects on the Solderability of Printed Circuits' in the > Technical Proceedings of Inter/Nepcon '69, in Brighton, as well as in my > book (pp. 76 ff). It is amazing that a problem that was identified 35 > years ago is still largely ignored! :-( > > Brian > > Susan Mansilla wrote: > > Hi Mike and All > > I am familiar with the abrasive wheel cleaning processes. but those are > done > > AFTER the tin/lead has been stripped. The response I got indicated that > the > > abrasive was used on the Tin/Lead deposit, which didn't follow my idea > of a > > possible process flow. > > Some PCB fab shops continue to use a "Scotch Brite" style of > > abrasive wheel or brush as a final surface prep operation prior to > > soldermask application. > > Susan Mansilla > > Robisan Lab > > > > --------------------------------------------------- > > --------------------------------------------------- > Technet Mail List provided as a 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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 > ----------------------------------------------------- > > --------------------------------------------------- Technet Mail List provided as a 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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------