Re: [TowerTalk] Sheave source wanted for Rohn EF2545 erection fixture

[Grant Saviers <grants2@pacbell.net>]

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



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