The problem with the bearings you indicate is that they are not
'thrust bearings!"
A thrust bearing is a particular type of rotary
<http://en.wikipedia.org/wiki/Bearing_%28mechanical%29>bearing. Like
other rotary bearings they permit rotation between parts, but they
are designed to support a high
<http://en.wikipedia.org/wiki/Axial>axial load while doing this.
73's
Tom - N4NW
At 09:08 PM 8/13/2009, Tod -ID wrote:
>This URL will carry you to an IPTCI bearing in the model series NANF. These
>bearings have 4 holes rather than two holes and have an eccentric locking
>collar. The price quoted here in potato country is about $70. Someone else may
>be able to comment on the significance of B-type or L3-type seals,
>4-hole versus
>a 2-hole bearing flanges and eccentric locking collars. The one I am
>looking at
>is designated as NANF 210-32 2S.
>
>To get the correct bearing use the URL and then change the shaft
>diameter to '2S
>in' .
>
>http://www.iptci.com/store/product/2/15917?s=2+in&e=B
>
>
>I have no pecuniary interest in these bearing --- only know how to find the
>store.
>
>Tod, K0TO
>
>
>
> > -----Original Message-----
> > From: towertalk-bounces@contesting.com
> > [mailto:towertalk-bounces@contesting.com] On Behalf Of Mike
> > Sent: Thursday, August 13, 2009 6:27 PM
> > To: towertalk reflector
> > Subject: [TowerTalk] Battle of the bearings
> >
> > I like to get thoughts/experiences about Rohn TB3 bearings
> > vs. Glenn Martin TB25.
> > The antennae will be a 4 element SteppIR and an M2 6M7JHV on
> > 20 feet of 2" chrom-moly.
> >
> > I plan to use 2 bearings. Can the bearings be mounted on a
> > rotor shelf (25G tower)?
> >
> > 73, Mike NF4L
> >
> >
> > _______________________________________________
> >
> >
> >
> > _______________________________________________
> > TowerTalk mailing list
> > TowerTalk@contesting.com
> > http://lists.contesting.com/mailman/listinfo/towertalk
>
>_______________________________________________
>
>
>
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Tom Gregory, N4NW
n4nw@n4nw.org
N4NW LLC - Complete Merchant Services
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