Hi, Andre, I don't think the aperture lists have any direct bearing on how wide the traces and spaces turn out to be. I once had some boards where the traces were much wider, and the traces much narrower, than they shoudl have been, simply because the fab house over-estimated its etch-back tolerance - i.e. the final etch took off much less material than the fab house thought it would. How do the spacings between traces compare with the sizes intended by the design? If they're narrow, the above isprobably your answer and not the aperture list. Peter Andre Leclair <[log in to unmask]> 11/03/2003 08:54 PM Sent by: TechNet <[log in to unmask]> Please respond to "TechNet E-Mail Forum."; Please respond to Andre Leclair To: [log in to unmask] cc: (bcc: DUNCAN Peter/Asst Prin Engr/ST Aero/ST Group) Subject: [TN] Aperture Data Morning all I have a question regarding Aperture List for Gerber Data. This is an area I know little about so bare with me. We had an incident with a PCB house which resulted in the boards being manufactured with all traces/pads 0.020" bigger then they were supposed to be. The shop said the problem arouse do to the way the aperture list was set up. The list has a set of 24 station #s with dimensions (which I understand get translated to d-codes). These Station#s are then repeated further down plus have extra #s to 999. We noticed that some of the dimensions in the 2nd set of station #s are differant from the 1st set. The 2nd set are the correct #s. The shop tells us their software (Infinite Graphics) will import the 1st set then ignore the 2nd set of repeated #s then will continue to import any station #s that are differant. When we look at the Data with GC-Place and look at the used Apertures we get the correct values. Could the error be due to a differance in the way the software interprets the list?.. The customer's data was created using P-Cad at least 10 years ago. The format the Lists are in are the same for all the customers product. A previous PCB shop had no reported difficulty. Any ideas would be helpful Thanks Andre --------------------------------------------------- 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 ----------------------------------------------------- [This e-mail is confidential and may also be privileged. If you are not the intended recipient, please delete it and notify us immediately; you should not copy or use it for any purpose, nor disclose its contents to any other person. Thank you.] --------------------------------------------------- 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 -----------------------------------------------------