store the bearings flat. a number of years ago when they first started shipping cars by rail the first train load of autos had to have all of the wheel bearings replaced. The investagation determined that vibrations in the cars caused micro notions in the races. Under load the bearings would failed in only a few hours. this eventualy led to the develepment of fretting corrosion theory. I would not be too quick to believe storage unloaded would cause damage but it theoretically is possible. FYI fretting corrosion is common in loose electrical connections that are vibrating since the corrosion is accelerated by current, galavinic scale distance of the involved materials, and dpresent of salt (sound familiar?). One of the worlds leading authorities(before he died) on this type of failure worked for AMP the former connector company. I was at one time a designer of machinery and my first experience with this type o failure was when the equipment failed after only 2 hours of testing.
larry
--- In electricboats@yahoogroups.com, John Green <v_2jgree@...> wrote:
>
> Thanks Erik,
>
> Yes, it would . The whole point made by the guy was that the bearing
> balls or rollers were static against the race surfaces for extended
> periods. It was stated that even in a regular house, with no industrial
> vibration, this would occur, due to things like the vibes from passing
> vehicles. It is just about impossible to isolate a stored bearing from
> vibration, apparently.
>
>
>
> Personally, I don't think that it is a big factor, but I am thinking
> that it might be prudent if taking a long trip, to make the room to
> have any stored spare bearings laid flat, rather than packing them into
> a vertical space.
>
>
>
> John
>
>
>
> 1b. Re: Bearing Storage and Intermittent Use Posted by:
> "[1]VE7YID@..." [2]VE7YID@... ve7yid Date: Tue Dec 4, 2012
> 7:50 am ((PST))
>
> Good post John! I remember being told that when I was an apprentice
> mechanic
>
> oh so many years ago.
>
> I wonder if letting the prop freewheel (turn) would solve the problem
> in our case? Erik
>
> References
>
> 1. mailto:VE7YID@...
> 2. mailto:VE7YID@...
>
> --
> http://www.fastmail.fm - A fast, anti-spam email service.
>
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Well described! Keep it up.
ReplyDeleteBoat Storage Daphne AL.