[GreenKeys] Governed model 14 motor

[Eric Moore]

Thank you John, I was told a synchronous motor would need a new gear set.

I am concerned about the rubber part, is there a manual for these motors I
can follow? I need to open it up and make sure the rubber looks ok.

I am torn on a tac or a tuning fork... I am leaning toward a tuning fork
since it is such a neat accompaniment to this artifact, and as someone
smartly mentioned I can dial in motor speed with the keyboard and a scope.

-Eric




On Mon, Feb 20, 2023, 8:24 AM John Nagle <nagle at animats.com> wrote:

>
>  > From: Eric Moore <mooreericnyc at gmail.com>
>  > Subject: [GreenKeys] Governed model 14 motor
>
>  > Hello, I have a model 14 KTR that I have been working on.
>  > I am looking for information on the governed motor it uses, picture
>  > attached.
>  > I am told it used a tuning fork for adjustment? Does anyone have one of
>  > these, or a set of instructions?
>  >
>  > Thank you for any help!
>
> Here's the tuning fork:
>
>
>
> https://www.ebay.com/itm/vintage-military-teletype-tuning-forks-Nanasi-JC-Deagan-Jerico-180vps-120vps/124333026125
>
> The motor has a centrifugal governor
> to maintain the speed at 1800 RPM. The tuning fork is
> to help adjust the governor.
>
> The idea is that you look at the striped wheel through
> the slits in the tuning fork, and adjust the speed until
> the slits are stationary. It's like using a strobe lamp.
>
> The little lever next to the flywheel on the motor adjusts
> the speed. It presses against a rubber wheel on the flywheel
> which turns a screw to increase or decrease the speed of
> the motor.
>
> I think you want a 90 or 180 or 360 vps tuning fork to get 1800 RPM.
> The motor's data plate says 1800 RPM. That's 30 revs/second,
> so if there are 12 white bars, you'd want a 360Hz flash.
> You can use a strobe lamp if you have one around. Goal is
> to get the motor running at 1800 RPM.
>
> There will be a lot of arcing and RF hash. The model 14
> is from the 1920s, before the widespread use of radio.
> Later models have some filtering, but the originals do not.
>
> Most Teletype machines still in use have a synchronous motor running at
> 1800 RPM, which makes everything simpler. Consider getting
> a synchronous Teletype motor. It's an easy swap. These machines
> are very modular.
>
>                         John Nagle
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