On 14 Dec 2011 at 9:31, Jack Olson wrote: > That's my experience, too.... > As a designer or librarian, UNLESS you are responsible for creating > your own paste screens (not the starting paste screen data file, the > actual finished Paste Screen), it is probably better to make the paste > screen apertures match the land sizes. I agree to both.. (making special paste screen AND making 1:1). It depends. Most "standard" stuff works fine with 1:1 and reduction by the stencil shop according to assembly house request; no need to think about for the librarian at all. If I use QFNs, (µ)BGAs, or other special stuff with big pads, heat sinks etc., then I try to contact the technicians who are responsible for assembly and ask for their recommendations. Not so easy to get in contact with assembly houses as I am "only" the external design bureau, additional work for the librarian (usually me :-) ), additional documentation, library variants... Best regards Matthias Mansfeld -- Matthias Mansfeld Elektronik * Printed Circuit Board Design and Assembly Neithardtstr. 3, D-85540 Haar, GERMANY Phone: +49-89-4620 0937, Fax: +49-89-4620 0938 E-Mail: [log in to unmask] Internet: http://www.mansfeld-elektronik.de ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 16.0 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 For additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------