Hey Steve is it you ? ; can't see any 'he'he's ; Sam wouldn't give you inferiority complex, would he ? READ THE INSERTS BELOW > ---------- > From: Stephen R. Gregory[SMTP:[log in to unmask]] > Sent: Friday, 31 July 1998 9:48 > To: [log in to unmask] > Subject: Re: [TN] Glenbrook x-ray?? > > In a message dated 98-07-30 19:14:35 EDT, you write: > > [log in to unmask] (Paul Klasek) > To: [log in to unmask] > > I concur with David ; have been watching this discussion for some > time > and kept out as I thought perhaps I'm the odd one out in extreme as > usual ; but since Dave cracked the pot the way it is : > If the process is out of window to such a degree this kind of > machinery > is needed ; I'd say $ much better spend would be in the process gear > ; not > inspection gear . >> > > Hey there Paul! > > Well since you and Dave started this, I'm gonna jump on the bandwagon > too. I > asked the question that I'm about to ask on another web forum a while > back, > and the reponses were kind of guarded...(it was like they didn't want > anybody > to see them answer with what some may percieve the wrong response). > But my > question was; why does it seem that if you want to do BGA, the > consensus is > you need to have xray capability? NO YOU DON'T ; IT IS NOT A CONSENSUS ; ONLY TROUBLE IS FEW OF US ARE PREPARED TO SPEND TIME ON ANALYSIS OF THE PROCESS(PREVENTION) BEFORE WE HIT IT . > I know that xray is a tool that will allow you to see things that you > normally > can't see, IT ACTUALLY ALLOWS YOU TO SEE VERY LITTLE > but is it REALLY necessary? It would seem to me that if you can > make sure that you lay enough paste down, put the part where it's > supposed to > go, and got your oven cranked-up with enough heat, you're in the BGA > business...and you can do all that stuff without an xray machine. YES, VERIFICATION OF PASTE AND BALLS AND PROFILE WILL GET YOU THROUGH > "But you can't see the solder joints dross-breath, that's why you need > an xray > machine.." some may say. But I didn't see everybody getting spooled-up > about > having xray when we started putting decoupling capacitors beneath DRAM > years > ago...can't see those solder joints either. So, is it really > necessary? WELL ; PERSONALLY I THINK THEY DON'T ADDRESS THE ISSUE EVEN TO A LIMITED EXTEND . FROM THE COST SIDE THE INTEREST FROM MONEY SPEND WOULD PAY YOU AN INSPECTOR . IT IS A DIFFERENT PICTURE IF YOU ACTUALLY HAVE TO SPEND , OR LOOSE IT ON TAXES . THAN YOU PLAY DIFFERENT TUNE . see you Steve Paul > -Steve Gregory- > > ################################################################ > TechNet E-Mail Forum provided as a free service by IPC using LISTSERV > 1.8c > ################################################################ > To subscribe/unsubscribe, send a message to [log in to unmask] with > following text in the body: > To subscribe: SUBSCRIBE TechNet <your full name> > To unsubscribe: SIGNOFF TechNet > ################################################################ > Please visit IPC's web site (http://www.ipc.org) "On-Line Services" > section for additional information. > For technical support contact Hugo Scaramuzza at [log in to unmask] or > 847-509-9700 ext.312 > ################################################################ > ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################