[PSUBS-MAILIST] reach rods

Wed Mar 18 23:34:37 EDT 2015

Hank,
        Yes, that is an option.  I think for rotating rods though you're suppose to have the O ring in the bore, that way the O ring will not tend to turn in the groove.  If you have it on the rod there is more surface area in contact with the O ring with respect to the rod rather than the Bore, there by inducing the O ring to turn in the groove.  I think the only issue is that I want to use a 1/2" rod in many different places, as it turns out if I had a rod that was .491 I would be right on the money using my 2-014 O ring and that would be good for 800 psi according to the Parker rotary O-ring seal specs.  But I really don't feel like machining all my 1/2" rods down .009" .  I can strike a happy medium with the my easy to acquire 1/2" rod by tweaking the tolerances with-in acceptable limits.  Groove diameter can go +.003 and the groove width can go +.004, Squeeze can go from 0 to 11%  and diametral clearance can be .012 to .016 

Brian  

--- personal_submersibles at psubs.org wrote:

From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
To: personal_submersibles at psubs.org
Subject: [PSUBS-MAILIST] reach rods
Date: Wed, 18 Mar 2015 19:04:46 -0700

Brian,
If machining the penetrator o ring groove is a problem, and I agree it is difficult.  Why not up size your reach rod and put the groove in the rod instead.  That is super easy and you can polish the groove with 2000 grit wet dry paper. You can machine the penetrator nice and smooth.
Hank
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