http://www.parker.com/o-ring/seal_design_page.pdf here is a link to their guide... Bill Brooks - KG6VVP PCB Design Engineer , C.I.D.+, C.I.I. Tel: (760)597-1500 Ext 3772 Fax: (760)597-1510 e-mail:[log in to unmask] http://www.dtwc.com http://pcbwizards.com -----Original Message----- From: Brooks,Bill [mailto:[log in to unmask]] Sent: Tuesday, January 04, 2005 4:59 PM To: [log in to unmask] Subject: Re: [TN] Oring installation help needed http://www.usseal.com/orings/Glanddimensions/general_oring_6.html Parker has real good guides on designing o-ring seals... Also Apple rubber is another good source I have used. Bill Brooks - KG6VVP PCB Design Engineer , C.I.D.+, C.I.I. Tel: (760)597-1500 Ext 3772 Fax: (760)597-1510 e-mail:[log in to unmask] http://www.dtwc.com http://pcbwizards.com -----Original Message----- From: COOKE, ROBERT W. (JSC-NX) (WGI) [mailto:[log in to unmask]] Sent: Tuesday, January 04, 2005 2:45 PM To: [log in to unmask] Subject: Re: [TN] Oring installation help needed Hal, O-rings are designed to seal against an internally or externally applied pressure. They are simple sealing devices, but require some attention to detail during design to work properly. For instance, in an application requiring the sealing of a cover plate on an electronic enclosure, this is accomplished by the slight compression and deformation of the ring into the o-ring groove as the two mating surfaces are brought together. If sealing of the panel where the cover plate screws penetrate is desired, the o-ring groove would be cut into the chassis boss concentric to each threaded hole, with the ring depth slightly less than the cross-sectional diameter of ring. The compression of the ring into the recessed well suggests that the well and ring are not size-matched, which will probably result in leaks. Guidelines for o-ring design and installation are found in "Marks' Standard Handbook for Mechanical Engineers". Regards, Bob -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Hal Winslow Sent: Tuesday, January 04, 2005 12:45 PM To: [log in to unmask] Subject: [TN] Oring installation help needed Hello there, This is marginally related to electronics, but hopefully someone on the list has some relevant experience. We are using some small Orings in some of our assemblies, just to keep splashed water out, nothing really high pressure at all. We need to seat these Orings into a plastic well, which is slightly smaller than the uncompressed OD of the Oring. This is a bit of a hassle, especially on the products where there are 20 Orings. Has anyone developed any sort of a neat little compression and insertion tool for Orings? Any suggestions would be greatly appreciated! Thanks, Hal Winslow Hwinslow at zoll.com --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------