[TowerTalk] Fwd: Fwd: Re: Request for replacement bearing information for tower raising fixture

[Mac]

Mark  enclosed is a compilation of recent emails from the time when we 
had this discussion pretty much in depth and it was covered pretty well 
i thought at the time,  and please review it,  lots of good or relivent 
info in this please ..  thanx and good luck:  mac/mc w5mc



-------- Forwarded Message --------
Subject: 	Fwd: Re: [TowerTalk] Request for replacement bearing 
information for tower raising fixture
Date: 	Fri, 6 Sep 2019 11:32:46 -0500
From: 	Mac <libbysales at austin.rr.com>
To: 	libbysales at austin.rr.com <libbysales at austin.rr.com>






-------- Forwarded Message --------
Subject: 	Re: [TowerTalk] Request for replacement bearing information 
for tower raising fixture
Date: 	Mon, 27 May 2019 09:34:46 -0700
From: 	Raymond Benny <rayn6vr at gmail.com>
To: 	Grant KZ1W <grants2 at pacbell.net>
CC: 	Tower Talk <TowerTalk at contesting.com>



The bearing for the tower pulleys is the Fafnir or Torrington K8 or KP8,
but not the KP8A! The KP8A is smaller.

Look on eBay about a month ago, there were 10 available, I bought two.
Think they were abt $25 each.

I have been pressing out the old, bad bearings and pressing in new ones for
years. Don't forget to use a small pointed punch and make new pinches to
keep the bearing more securely in place.

Ray
N6VR

Near Prescott, AZ

On Mon, May 27, 2019, 2:01 AM Grant Saviers <grants2 at pacbell.net> wrote:

> I checked Fafnir cross reference and am not sure the ebay K8 is the
> correct bearing.  The cross reference makes it a 208K8, a much larger
> bearing and the price correlates.  Better check with the seller about
> the exact dimensions.
>
> On one crank up where I replaced the lift cable bearing, used an
> aircraft control cable ball bearing (found on ebay) which has a wide
> inner race so the sides of the sheave (and the control wire) can't
> contact the support flanges.  Or with a couple of correct
> id/od/thickness washers on a regular deep groove ball bearing that fits
> the existing sheave.   Ideally, the bearing outer race should be swaged
> into the sheave, but some high strength loktite bearing retainer will
> also work.
>
> Grant KZ1W
>
> On 5/26/2019 14:07 PM,charlie at thegallos.com  wrote:
>> Is it a needle or a ball bearing?
>>
>>
> https://www.amazon.com/K8-12-10-Consolidated-New-Needle-Bearing/dp/B01JVGV7AU
>> https://www.hendersonbearings.co.uk/k8-ball-bearing-brand-skf.html
>>
>> If you have a local bearing supply house, you can take it there, they
>> will tell you what you need
>>
>> Interestingly, we are back to one of the BIG issues from the early days
>> of ball bearing - failures of bearing that rarely move, out in the
>> weather, under heavy load
>>
>> Bronze bearing remained in common use in that situation for a LONG time,
>> but need an oil reservoir.
>>
>> My pet thing - again, is this is where the PROPER use of plastic bearing
>> materials would probably be the best thing.
>>
>>
>>
>> On 2019-05-25 20:27, Kim wrote:
>>> Scotty,
>>>
>>> Contact Ray at isheaves.com
>>>
>>> He's working with several hams to line up a run of pulleys to meet our
>>> needs.
>>>
>>> 73, Kim - WG8S
>>>
>>>
>>>> On May 25, 2019 at 2:49 PM Scotty<scotty at ashiko.com>  wrote:
>>>>
>>>>
>>>> I have a US tower TX-455 that tilts over.
>>>>
>>>> The bearing in the top of the raising fixture's sheave needs replacing.
>>>>
>>>> The matching sheave on the tower has the same bearing and is still in
>>>> good shape.
>>>>
>>>> I can press out the old bearing and press in a new bearing.
>>>>
>>>> Can someone please tell me the brand name and model number of the
>>>>
>>>> bearing that they have used for this replacement?
>>>>
>>>> Bearing bore size is about 12 mm.?? OD is about 42 mm. Width is about
>>>> 13 mm.
>>>>
>>>> The worn out bearing says: NICE PHILA K8
>>>>
>>>> Sincerely appreciate any help.
>>>>
>>>> Scotty W7SW
>> _______________________________________________
>>
>>
>>
>> _______________________________________________
>> TowerTalk mailing list
>> TowerTalk at contesting.com
>> http://lists.contesting.com/mailman/listinfo/towertalk
>>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk at contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk