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Other Vintage Household Electrical or Electromechanical Items For discussions about other vintage (over 25 years old) electrical and electromechanical household items. See the sticky thread for details.

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Old 8th May 2021, 7:31 pm   #41
merlinmaxwell
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Default Re: IBM Factory Clock

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A GPO Master Clock (Clock 36) would not be suitable as it doesn't provide 60 second pulses
My Magneta version has a 60 second pulse unit, that drives the 60 second dial on the case (which I leave on GMT just to confuse visitors), the other unit is a 30 second one driving the house clocks. There where many different "counters" for PO 36 clocks. A favourite for exchanges was 6 seconds for the call cost counters.
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Old 8th May 2021, 8:33 pm   #42
M0FYA Andy
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Default Re: IBM Factory Clock

Is your Magneta a Magneta-made PO36 or a Magneta M37 on which the PO36 was based? I also have an M37 with a 60-second set of contacts.

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Old 9th May 2021, 12:47 pm   #43
Paul Stenning
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Default Re: IBM Factory Clock

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Originally Posted by Nickthedentist View Post
...or a quartz clock mechanism with the seconds hand operating an optointerruptor.
I like this idea, because it is simple and low tech. You do actually have a master clock (albeit a battery powered quartz movement) driving the slave clock too.

Also these movements are a good way of getting accurate low cost mechanical timekeeping. I have seen them used in things like cat feeders for exactly that purpose.

An opto-interruptor (make a double-ended second hand for 30 seconds), a power transistor or relay with a bit of other electronics, and a spare power supply or battery, and it shouldn't cost more than a tenner or so. You can buy a cheap clock in Ikea, a pound shop or charity shop just for the mechanism and second hand.
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Old 9th May 2021, 1:07 pm   #44
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Default Re: IBM Factory Clock

If you are going to butcher anything I would go for the quartz movement.
It would not be difficult to make a divide by 30/60 circuit with a couple of chips.
You will then have 4 wires and the ability to use either type of slave clock.
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Old 9th May 2021, 1:27 pm   #45
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Default Re: IBM Factory Clock

Or use two optointerrupters with a single second hand, if you finf that easier than making a new hand.

There are so many ways of doing this, that you have to pick something which best fits your tastes, abilities and what you have to hand.

Sometimes, when confronted with too many things to choose from, I can be stopped in my tracks for an embarrassing amount of time.

David
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Old 9th May 2021, 3:45 pm   #46
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Default Re: IBM Factory Clock

Andy, here is the nameplate...
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