Hi Carl, For a twisted board I wouldn't know how to measure it after assembly, but for warp (bow) you can do it like this: Hold a steel ruler against the edge of the board, perpendicular to the boardsurface, in such a way that there is an equal gap between the boardsurface and the ruler at both ends. Now use shims of various thicknesses to measure the gap. The value that you get, times hundred, divided by the lenght of the measured side gives you the percentage of bow for this side of the board. The highest value for the four sides of the board is the one to compare to the spec limit. Daan Terstegge Thales Communications Unclassified mail Personal Website: http://www.smtinfo.net >>> [log in to unmask] 04/02/03 12:14am >>> Any of you guys know how to measure board warpage after the unit has been completely process? Process: SMT Bottom SMT Top PTH Axial and Radial Hand loaded Wave Solder Post wave processing At my Incoming receiving area I can detect board warpage but after the wave process (sometimes SMT Top) the boards start to warp. All the profiles have been verified and validated. We know we have a vender issue but the problem is our customer will not accept the unit we have in process (around 500). So if anyone has any suggestions it would be greatly appreciated. Carl Ray Sr. Manufacturing Engineer Huntsville, AL 35807 Phone: 256-882-4800 ext. 8845 Cell: 256-990-1990 --------------------------------------------------- Technet Mail List provided as a free 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/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 1.8e 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/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------