>>> [log in to unmask] 09/19/01 09:24AM >>> Charles - My former company used PPT for some customer prototypes and they liked it. Contact me off TechNet and I can give you more details. Ed Valentine Electronics Manufacturing Solutions 8612 Mourning Dove Road, Raleigh, NC 27615 Phone: (919) 270-5145, Fax: (919) 847-9971 Email: [log in to unmask] Website: http://www.ems-consulting.com ----- Original Message ----- From: "Jack Crawford" <[log in to unmask]> To: <[log in to unmask]> Sent: Wednesday, September 19, 2001 10:57 AM Subject: Re: [TN] SMT Process Validation >>> "Charles McMahon" <[log in to unmask]> 09/18/01 07:00PM >>> Hello All: In response to the issues for short-run assembly, I have found that each assemblers profile status is a moving target based on the particular expertise and equipment of the supplier. In my experience I have found the primary cause for re-work is the paste method application & ste4ncil along with the calculation of dwell time at reflow etc. I believe that this variable is the cause of most of the re-work incidences. If we can control the paste factor, we would have a material impact on the result in my view. With that said, are there any opinions on the PPT technology (precison pad)for controlled paste deposition that is now being introduced? IMHO it appears this could address the short run issue specifically. And, as a board/assembly supplier providing DFM services, it would have a demonstrable benefit for the customers I serve. Any opinions are respectfully solicited on this process. Charlie McMahon -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of Jack Crawford Sent: Tuesday, September 18, 2001 4:39 PM To: [log in to unmask] Subject: Re: [TN] SMT Process Validation >>> Barry Gallegos <[log in to unmask]> 09/18/01 03:08PM >>> Rich, We too are in this same boat. If you find an answer, please would you share your findings. Barry Gallegos Process Engineer Western Electronics 1550 South Tech Lane Meridian, Idaho 83642 Phone: 208/955-9771 Fax: 208/955-9755 -----Original Message----- From: Jack Crawford [mailto:[log in to unmask]] Sent: Tuesday, September 18, 2001 12:20 PM To: [log in to unmask] Subject: Re: [TN] SMT Process Validation >>> Rich Lasko <[log in to unmask]> 09/18/01 12:56PM >>> Good afternoon everyone, We have been doing some smaller qty prototype or very low volume production runs (Qty 5-10pcs) on our SMT equipment. We have been encountering some low yields at the SMT inspection for this type of production/prototype runs (They are nearly fixing each board for some reason or another). The feedback that I am getting from that department is that they can not accurately "tweak" the process with this low number of qtys (by the time they get close to having the machine programs set, they have completed all the boards in that order). So the next time we run the job, we continue to "tweak" the process in order to improve the yields. What this has caused us is some continuous rework at the end of the SMT line repairing the slid, shifted, or tombstoned components or incomplete solder reflow. Have any of you encountered a similar type experience and if so how was it handled in order to improve the yields? Thanks in advance for your help on this matter. Rich Lasko Badger Electronics ---------------------------------------------------------------------------- ----- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d 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 delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail 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 ---------------------------------------------------------------------------- ----- ---------------------------------------------------------------------------- ----- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d 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 delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail 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 ---------------------------------------------------------------------------- ----- ---------------------------------------------------------------------------- ----- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d 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 delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail 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 ---------------------------------------------------------------------------- ----- --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d 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 delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail 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 ---------------------------------------------------------------------------------