[GreenKeys] Motor gear questions

[Joe Clanin]

I’ve got a spare 74505/74151 gear set, not new but in good shape.

Offers considered, pictures available upon request.

Best,

Joe

On Fri, Jun 23, 2023 at 5:31 PM John, W9DDD <w9ddd at tapr.org> wrote:

> For a governed motor that runs at 2102 RPM (usually just listed as 2100
> RPM)   If someone had a junker TG7 they might have be able to get the
> gear.  I don't know how many people might have converted their TG7 to a
> synchronous motor (1800 RPM) and then threw the old gears in their junk
> box? (TG7 = military M15)
>
> ---
> ----
> You said "tomorrow" yesterday.
>
> The above comments or recommendations are SWAG. Use at your own risk.
> John, W9DDD
>
> On 6/23/2023 4:38 PM, Jeff G wrote:
>
> Found it here, page 47:
> https://www.navy-radio.com/manuals/tty/1114B-4309.pdf
>
> They are 60wpm (45.5 baud) gears for a specific motor. Hopefully that page
> helps you out.
>
> Jeff kc3gjx
>
> On Fri, Jun 23, 2023 at 4:24 PM John Nagle <nagle at animats.com> wrote:
>
>> This is for Dave Rabinowitz, who is trying to get a Model 15 going.
>> He's having motor gearset problems, with a broken gear.
>>
>> His machine has these gears.
>>
>> 74505 PINION (7 teeth) on the motor shaft, which meshes with
>> 74151 GEAR (35 teeth) [the broken one]
>>
>> That matches this Teletype manual:
>>
>>
>> http://aetherltd.com/public/model15manuals/1110B_Model15_Parts_Dec43_ArmyVer.pdf
>>
>> That's an Army manual. Not sure what speed those gears are for.
>> They only list one option, so that was apparently the Army
>> standard.
>>
>> Here's a list, from a ham sales company, in 1971, that
>> has all the gears:
>>
>> https://www.navy-radio.com/manuals/tty/W2DLT-1971.pdf
>>
>> That shows the 74912/74913 pair for 60-speed machines,
>> which is what I've read elsewhere.
>> Nothing in that table matches the Army manual.
>>
>> So, 1) does anybody know what speed the 75505/74151 pair
>> runs at, and what's the situation on getting replacement
>> gear pairs?
>>
>>                         John Nagle
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