[TowerTalk] Sheave source wanted for Rohn EF2545 erection fixture

[Grant Saviers]

Instant solution is in the lathe  and drilled for 3/8 bolt as there 
isn't much hub material for a bushing.  I'd use an end mill for the 
drilling since the worn hole probably isn't round and certainly isn't 
straight.  5 minute lathe job.

It's a poor design as supplied.  Should have flat oilite thrust bearings 
each side so the sheave stays centered and a bore oilite or ball 
bearing.  It is amazing how much lower drag is with ball bearing 
sheaves.  A 5200-2RS double row ball bearing pressed into a new solid 
cross section sheave would be ideal.  zoro.com or your local supplier.

Grant KZ1W


On 1/18/2018 9:38 AM, George Dubovsky wrote:
> Chuck it in a lathe, bore slightly oversize, press in brass or steel
> bushing as desired. Probably 15 minutes of work in a machine shop.
>
> 73,
>
> geo - n4ua
>
> On Thu, Jan 18, 2018 at 12:30 PM, Jon Zaimes <jz73 at verizon.net> wrote:
>
>> I'm trying to replace the worn sheave on the top pulley assemblies of two
>> Rohn EF-2545 gin poles. This appears to be cast aluminum with a 5/16" bolt
>> going through the center hole. The sheaves measure 2 3/8" outer diameter,
>> and are 5/8" wide. The center hole in the sheave has worn with time such
>> that these are now wobbly and risk pinching the haul rope if it jumps out
>> of
>> the sheave.
>>
>> I tried contacting Rohn and they directed me to their distributors. The
>> first I called said they couldn't help me, and the second said they didn't
>> have it but would try their contact at Rohn.
>>
>> There is no listing for this part in the online Rohn catalogs for this.
>> I've
>> been unable to match up anything of this size or close from any industrial
>> suppliers thus far.
>>
>> Anyone have a source?
>>
>> There's a photo here: http://www.aa1k.us/sheave
>>
>>
>>
>> 73/Jon
>>
>>
>>
>> Jon P. Zaimes, AA1K
>>
>> Tower climber for hire
>>
>> http://www.aa1k.us/
>>
>>
>>
>> Reviews of AA1K tower work on eham website:
>> http://www.eham.net/reviews/detail/12922
>>
>>
>>
>> Hug your favorite tower every day, and always stay connected to it.
>>
>>
>>
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