I'm thinking changing the tolerance will only buy you more frustration... If you are seeing up to 50% reduction from surface to base I'm thinking you should look at the starting - vs- plated copper being used, the amount of mfg adjustment being made on the artwork, the etch process itself...for starters... That seems to be an extreme amount of etching being performed and it would be easier to resolve that than try to tolerance quality into it... Just my thoughts... Franklin --------------------------------------------------- Technet Mail List provided as a 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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------