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
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