[TowerTalk] Request for replacement bearing information for tower raising fixture

[Grant Saviers]

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
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