HELLO
Did you use one of this on top of the tower or another one inside tower,
between rotor and top of the tower?
thanks,
Jorge
2016-12-09 12:10 GMT-03:00 George Dubovsky <n4ua.va@gmail.com>:
> >I would expect either
> >tapered roller bearings, or today, do what most of industry does, and use
> >an engineering plastic bearing.
>
> And, in fact, that's what I do. One mast has a brass shaft collar that
> rides on a slab of Nylatron (GS grade I think), and the other mast uses a
> scrap TB-3 that was machined to replace the ball assembly with a Nylatron
> sleeve insert for axial and radial thrust. I expect both of them to outlive
> the towers they're sitting on... ;-).
>
> 73,
>
> geo - n4ua
>
>
> On Fri, Dec 9, 2016 at 9:14 AM, <charlie@thegallos.com> wrote:
>
> > > Looks really well made. I had the original Rohn counterpart for years
> > and
> > > it just kept on going.
> > > I added a zerk fitting so I could grease it. They last a very long
> time
> > > dry without lube, but I am anal
> > > about lubing everything hihi.
> > >
> > >
> > > Bob
> > > K6UJ
> >
> >
> > Looks nice, but one thing I just have not been able to understand for
> years
> >
> > Tower thrust bearings are a LOW rotation speed, high load application,
> > probably the WORST place to use ball bearings. I would expect either
> > tapered roller bearings, or today, do what most of industry does, and use
> > an engineering plastic bearing. I mean, we don't need a torlon bearing
> > there (the loads are NOT that high)
> >
> > I mean, a glass reinforced nylon, or a PTFE (Teflon) (say a 25% glass
> > filled or molly filled) isn't going to cold flow at ALL under loads a 2"
> > mast could sustain, will NEVER need lubrication, will never corrode etc
> >
> > You either get them molded for you (for some materials would be the
> > cheapest way - you do NOT want to know what torlon costs), or you slice
> it
> > from tube, or you even just use end on rods set around the circumference
> >
> > I mean, today they run the pivot bearings and lower boom bearing on
> cranes
> > in plastic bearings, because they hold up better than metals in those low
> > rotation speed, intermittent rotation applications
> >
> > _______________________________________________
> >
> >
> >
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--
73,
Jorge
CX6VM/CW5W
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