[Phono-L] Columbia Grafonola Electiric motor shutoff question

[Greg Bogantz]

    I'm not familiar with this type of Columbia electric motor, but it 
sounds like it may be a variant that includes the Columbia "non-set 
auto-stop" mechanism that was used on the more expensive spring motor 
models.  I have a Columbia electric motor model, but the switch mechanism is 
simple and is merely coupled to the tonearm by a lever.  Some of our readers 
have probably worked on the non-set auto-stop spring motors and can perhaps 
help you to figure out how it works.  It's a clever design and somewhat 
complicated.  I don't know if there is any documentation available on how to 
service these, but it would be a valuable addition to the phono literature.

Greg Bogantz


----- Original Message ----- 
From: "Daniel Melvin" <dan at old-phonographs.com>
To: "Phono-L at oldcrank.org" <phono-l at oldcrank.org>
Sent: Monday, December 21, 2009 11:47 AM
Subject: [Phono-L] Columbia Grafonola Electiric motor shutoff question


> Does anyone have any information on the rather complicated
> geared switch mechinism on an electric Columbia motor? I have a machine
> where that mechinism seems to have frozen up which was keeping the motor
> from running. I took it apart and stared at it quite a lot and cannot even
> figure out how it works. It has a bunch of gears and a cam that turns the
> motor off and on.
>
> To get the machine working I disconnected the gear attached to the tonearm
> and rigged a manual switch for the motor. It works great, but I would 
> really
> like to restore the original switch mechinism if anyone has suggestions or
> information on it. I have all the original parts, but the switch lost me 
> in
> the dust.
>
> And, I thought Edison made complicated machines! This switch is amazing.
>
> Thanks
>
> Dan
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