Ok, but I thought you were measuring placement, not the amount of tombstoning. Surely you can use them for that purpose. You simply put double sided clear tape down over the pattern to determine how far off target the placements are. I use an X-ray that has measurement capability to do this. For example, on the VJ2500 X-ray machine I tell the X-ray that from the center of a given via to the center of the next via is a known distance of .050". The machine calibrates itself based on that information. It can then measure the distance between the center of the 0201 pads to the center of the placed part and tell you the variation (deviation from the mean) of all of your placed parts. Cumulative data will then establish the CpK of the placer. Most good X-ray machines have the capability for performing this type of measurement. You can use some other measuring tool as well. I just find the X-ray an easy and extremely accurate inspection tool for measuring this type of variation. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Tempea, Ioan Sent: Tuesday, June 26, 2007 9:58 AM To: [log in to unmask] Subject: Re: [TN] SMT placement test PCB Basically landpatterns too widely spaced to avoid tombstoning. Ioan -----Original Message----- From: Stadem, Richard D. [mailto:[log in to unmask]] Sent: Tuesday, June 26, 2007 10:01 AM To: TechNet E-Mail Forum; Tempea, Ioan Subject: RE: [TN] SMT placement test PCB Just curious, why did you find the Practical and Topline pwbs unsatisfactory? -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Tempea, Ioan Sent: Tuesday, June 26, 2007 8:56 AM To: [log in to unmask] Subject: [TN] SMT placement test PCB Dear colleagues, I am pondering the necessity of having a custom PCB designed, PCB that would serve for periodical testing of the placement of our machines. We have Fuji CP6 and IP3, just FYI as I don't think the board should be speciffic to a machine in particular. I am wondering if any of you felt the need of having a special PCB to perform this, or you find the glass board for IP and the regular Fuji test board sufficient? I have checked the available boards from Practical and Topline and find them unsatisfactory when it gets to 0402 and 0201 landpatterns. If you would order a special PCB, how would you use it? What components should it be there? Thanks, Ioan --------------------------------------------------- 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 -----------------------------------------------------