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Hi
Scott,
I had this same concern early on when I was machining some prototype thru
hulls. The only refrence that I noticed was in the Parker o ring handbook
where they show rotating shaft o rings have the o ring inside the collar.
I think the reasoning behind this is that when the shaft rotates there is more
surface area touching the o ring when it is in the collar and therefore the o
ring does not have a tendentcy to turn in the o ring groove, whereas in the
other configuration ( on the shaft) the whole o ring will turn possibbly causing
more ware. For shatfs that move in and out o rings would be on
the shaft it self.
Brian
For the rotating tru hulls the K-350 design shows to
put a internal groove inside the collar and the o-rings are inserted and
seated in it. I know I heard a few people saying you can do the opposite and
put the grooves on the shaft and seat the o-rings there, however it will take
a different size of o-ring. Is this ok to do? I don't see any problems with
it, but I may be overlooking something. It seems it would be easyier to lathe,
and easyier to service the o-rings. Also, before I do this, is there any
special kind of o-rings, or will the ones you get at the hardware store work
(as long as the mesurment tolarences are correct).
Thanks,
Scott
Waters
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