I believe IPC allows 20% overhang which avoids rework from placments that are alittle off and didn't correct during reflow. In your case you'd have to be concerned with the placement accuracy and potential rework since the design is taking up almost all of the tolerance. ----- Original Message ----- From: "Cindy S. Bohler" <[log in to unmask]> To: [log in to unmask] Sent: Monday, April 20, 2009 2:10:34 PM GMT -05:00 US/Canada Eastern Subject: [TN] The effects of vibration on SMT part overhang We have a case where we are putting a 2512 package resistor in a location that was designed for a 2515 package resistor. There will not be any overhang in the X direction, but there will be a 14% overhang in the Y direction. Does anyone know the effects of vibration on SMT part overhang? Thanks. --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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 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 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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 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 -----------------------------------------------------