I'm trying to chew through the restraints as we talk. Dewey -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Hernefjord Ingemar Sent: Friday, December 07, 2007 6:32 AM To: [log in to unmask] Subject: Re: [TN] Laser Soldering vs Selective Soldering Now I'm waiting for Dewey's reply of the year... /Inge -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Eric CHRISTISON Sent: den 7 december 2007 14:28 To: [log in to unmask] Subject: Re: [TN] Laser Soldering vs Selective Soldering Yes, These machines can suck balls back off a device as well as putting them. Regards, Yuan-chia Joyce Koo wrote: > 1) why you need 100W? I am sure BGA needs less... > 2) balling 24 hrs a day sounds good... how expensive it could be? per > device should be cheap... besides, you can possibly repair using laser > rather than repair the complete device by reflow... > jk > On Dec 7, 2007, at 7:52 AM, Eric CHRISTISON wrote: > >> My company uses lasers for putting the balls onto BGA packages in >> mass production. The equipment is eye wateringly expensive but in >> some circumstances where the machines are balling the same device 24 >> hours a day it seems to make economic sense. >> >> I'd agree that for other applications the process wouldn't seem very >> well suited. >> >> >> >> Hernefjord Ingemar wrote: >>> Yes, I think the cost was a disadvantage. The last 100W YAG we >>> bought a few years ago was at some 500,000 USD (not for soldering). >>> You get several IR ovens for that sum. And the throughput for a >>> laser is slow compared to oven mass soldering. Would be interesting >>> to know how many TNetters have a laser soldering equipment... >>> /Inge >>> -----Original Message----- >>> From: TechNet [mailto:[log in to unmask]] On Behalf Of John Burke >>> Sent: den 6 december 2007 23:41 >>> To: [log in to unmask] >>> Subject: Re: [TN] Laser Soldering vs Selective Soldering >>> >>> >>> Yes it did fade away, although I am not sure it ever really blommed. >>> I remember when I put a laser soldering YAG system on the SMARTEX >>> exhibition production line in Wiesbaden Germany in 1987 that : >>> >>> A It worked fantastically well >>> B Everone was excited about it >>> C The yields were fantastic >>> D Nothing ever came of it...............cost?? >>> John Burke >>> (408) 515 4992 >>> >>> -----Original Message----- >>> From: Hfjord [mailto:[log in to unmask]] >>> Sent: Thursday, December 06, 2007 2:35 PM >>> To: 'TechNet E-Mail Forum'; 'John Burke' >>> Subject: SV: [TN] Laser Soldering vs Selective Soldering >>> >>> The trick (YAG) seems to be the ramp-up of pulses. I don't remember >>> what sequence was optimal, but if you had tens of variations of >>> solder and components, there was a lot of experimenting to find the >>> individual shot ramp-ups. The enthusiasm for laser soldering faded >>> away....this was 15 years ago...at least. Inge >>> >>> -----Ursprungligt meddelande----- >>> Från: TechNet [mailto:[log in to unmask]] För John Burke >>> Skickat: den 6 december 2007 19:20 >>> Till: [log in to unmask] >>> Ämne: Re: [TN] Laser Soldering vs Selective Soldering >>> >>> CO2 has been around since the mid '80's as soldering systems >>> (Dynapert as >>> was) as have YAG soldering systems, I have used both - they both work. >>> >>> CO2 is less forgiving as you have to have total accuracy, if it hits >>> the laminate it will basically burn it as from memory you get total >>> absorption at that frequency. >>> >>> Use a (prime frequency) YAG and it will be more forgiving as the >>> joint has high absorption whereas the laminate is from memory 10 to >>> 20% so you will not have the same effect, in fact I have seen >>> demonstrations where the vendor was soldering joints by lasing >>> through the BACK of a board (Basel Laser Technik - 1986) >>> >>> If you really want to do this there are vendors who make laser >>> rework equipment which might be suitably modified. >>> >>> Kind regards, >>> >>> John >>> >>> John Burke >>> (408) 515 4992 >>> -----Original Message----- >>> From: TechNet [mailto:[log in to unmask]] On Behalf Of Ray, Carl (GE >>> Indust, GE >>> Fanuc) >>> Sent: Thursday, December 06, 2007 5:57 AM >>> To: [log in to unmask] >>> Subject: [TN] Laser Soldering vs Selective Soldering >>> >>> Hi All, >>> How many of you "out there" have any experience with laser >>> soldering machines verse selective soldering machines? Currently we >>> have several types of selective soldering equipment but due to our >>> designs we are having significant issues with adjacent components. >>> I have seen some equipment but do not have experience with the >>> venders or process. >>> >>> --------------------------------------------------- >>> Technet Mail List provided as a service by IPC using LISTSERV 15.0 >>> 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 847-615-7100 ext.2815 >>> ----------------------------------------------------- >>> >>> --------------------------------------------------- >>> Technet Mail List provided as a service by IPC using LISTSERV 15.0 >>> 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 847-615-7100 ext.2815 >>> ----------------------------------------------------- >>> >>> --------------------------------------------------- >>> Technet Mail List provided as a service by IPC using LISTSERV 15.0 >>> 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 >>> 847-615-7100 ext.2815 >>> ----------------------------------------------------- >>> >>> --------------------------------------------------- >>> Technet Mail List provided as a service by IPC using LISTSERV 15.0 >>> 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 >>> 847-615-7100 ext.2815 >>> ----------------------------------------------------- >>> >>> >> >> --Eric Christison Msc >> Mechanical Engineer >> Home Personal, Communication Sector >> Imaging Division >> >> STMicroelectronics (R&D) Ltd >> 33 Pinkhill >> Edinburgh EH12 7BF >> United Kingdom >> >> Tel: +44 (0)131 336 6165 >> Fax: + 44 (0)131 336 6001 >> >> --------------------------------------------------- >> Technet Mail List provided as a service by IPC using LISTSERV 15.0 >> 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 >> 847-615-7100 ext.2815 >> ----------------------------------------------------- >> > > -- Eric Christison Msc Mechanical Engineer Home Personal, Communication Sector Imaging Division STMicroelectronics (R&D) Ltd 33 Pinkhill Edinburgh EH12 7BF United Kingdom Tel: +44 (0)131 336 6165 Fax: + 44 (0)131 336 6001 --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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 847-615-7100 ext.2815 -----------------------------------------------------