Hi Susan, Nominal is the target dimension. Assuming a perfect world, all the dimension would measure exactly the nominal dimension. Somewhere else on that drawing the designer listed a tolerance, which is how much that dimension can vary from the nominal or target. If you add the tolerance to the nominal or subtract the tolerance from the nominal, you will get the maximum and minimum dimensions. Ryan Grant -----Original Message----- From: [log in to unmask] [mailto:[log in to unmask]] Sent: Thursday, October 10, 2002 12:44 PM To: [log in to unmask] Subject: [TN] DRAWING NOMINAL What does it mean when a drawing lists a dielectric thickness between layers on a multilayer as "nominal"? I am used to seeing minimums and maximums, but really do not know how to determine compliance if the value is listed as "nominal". Thanks Susan Mansilla Robisan Lab ---------------------------------------------------------------------------- ----- 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 ---------------------------------------------------------------------------------