>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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