[TowerTalk] Battle of the bearings

[Tod -ID]

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 at contesting.com 
> [mailto:towertalk-bounces at 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
> 
> 
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