[TowerTalk] Sprockets with 2" bore needed

[K8RI]

On 4/28/2012 11:34 PM, TexasRF at aol.com wrote:
> Your local bearing supplier is your friend. They can furnish any available
> size in quick turn around. If machining is needed (unlikely with all the
> parts  and options available) they can provide that as well.

Thanks Gerald,

I spent over an hour and a half on Granger's web site until it told me I 
had exceeded the number of allowable searches.  I gave them a list of 
specs in an e-mail and they said they couldn't help me.  I could 
certainly pick out something that would work, but without the proper 
information I don't know how long it'd last.

I don't think we have a supplier locally so it might involve a couple 
hours driving.  I have a machine shop complete with a Bridgeport that 
has digital read out and programmable X and Y axis power feeds.  Really 
wish I had all three. <:-)) The nearest I find that "Might" have what I 
want is a 2 hour drive...one way.
I did find one place in NJ that sells timing belt gears.  Timing belts 
are strong, rugged, very little stretch, and would probably last longer 
than chain, BUT they aren't near as easy to get in and out of a tower.  
With a chain you pull the pins from the master link and it comes 
out.Getting a timing belt off a sprocket on a 2" mast  between two 
thrust bearings would be a real challenge.
Hope to have a good tool room lathe soon but could bore out the sprocket 
with one of several tools on the Bridgeport including a fly cutter 
although I really don't like using those. I also have a boring tool with 
adjustable, carbide teeth.

Ideally the primary chain off a big motorcycle with two of the larger 
sprockets  would likely work  great, although I'd guess it'd be pretty 
pricey.

73

Roger (K8RI)
>
> WW Grainger also carries a lot of this type material.
>
> 73,
> Gerald K5GW
>
>
>
>
>
>
> In a message dated 4/27/2012 4:04:25 P.M. Central Daylight Time,
> K8RI-on-TowerTalk at tm.net writes:
>
> On  4/27/2012 4:34 PM, Jim Hoge wrote:
>> Check McMaster- Carr. They list  them but with a higher price tag. The
> manufacturer you want to search is  Martin Sprocket and Gear. Any supplier of
> power transmission equipment ought  to carry them. If you can tolerate a
> larger outside dimension then you can  away from searching for only finished
> bore sprockets and go for bushing bore  sprockets as well.
>
> If I can find the right size I can also bore them  out myself although
> I'd rather not because you have to be really careful  in chucking them up
> to get the sprocket to run  true.
>
> 73
>
> Roger  (K8RI)
>
>
>
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