Are the pulleys the same diameter on both shafts? If so, you could replace them
with two minature sprockets and mini-chain. If they're different diameters, you
divide the large by the small to get the ratio. Then two different sized
sprockets can be figured by the number of teeth for each so the ratios match.
Small Parts, Inc. down in Florida (I think they are) carry this very stuff. Any
chain length slack can be taken up by mounting a small chain tensioner.
Best,
Will
*********** REPLY SEPARATOR ***********
On 1/23/06 at 7:53 AM Scott Townley wrote:
>I am unfamiliar with these types of mechanics so it may take me awhile to
>give all the right info.
>The pulleys here use a plastic-covered metal cord (probably steel wire).
>Each pulley has a gap on the periphery to permit the wires to route into
>the pulley area. There are a pair of raised tabs (similar to clips) on
>the pulley surface that form a triangle with the gap. On one pulley the
>wires are looped, crimped with a malleable and hooked onto these tabs,
>exiting the pulley via the peripheral gap and then wrapped around the
>periphery. The 'far' pulley accepts the wire around its periphery, the
>wire enters the gap and hooks around the raised tabs in a continuous
>triangle. In the end, the wire only makes one 'loop' around each pulley
>(there is no overlap).
>The pulleys appear to be held onto the shafts by what you could call a
>very short shaft coupler--a cylinder with setscrews but only about 1/4"
>long.
>What it all appears to me as is: (1) there is no means to adjust the cord
>tension, and (2) I can't figure out how the pulleys even turn the shafts.
>The 'shaft coupler' is NOT unitary with the pulley...which I would have
>expected. Maybe it's supposed to be, and mine is broken somehow?
>
>Later today I can put some pix of the specifics on the web for viewing.
>Maybe the description will help, maybe not.
>thanks all,
>
>>
>> From: Scott Townley <nx7u@arrl.net>
>> Date: 2006/01/22 Sun PM 11:59:56 EST
>> To: amps@contesting.com
>> Subject: [Amps] corded dial drive help
>>
>> My project amp (specifically BTI LK-2000) has one of those ganged-corded
>> dial drive mechanisms to turn the input and output band switches
>> together. Is there any reference mat'l that someone can point me to on
>how
>> to maintain/adjust these types of things? One is slipping and doesn't
>> respond to my attempts at figuring out how it works (I can't see at all
>how
>> it works, actually).
>> TIA,
>>
>>
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>>
>
>Scott Townley NX7U
>Gilbert, AZ DM43di
>
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