[time-nuts] Wall Clock that takes 1PPS input

[paul swed]

Jerry the old IBMs are loud at the 1 minute mark or if pulsed clunk clunk
clunk. Great when you first start them annoying after a bit. But if the
cost is $0 have fun and learn. With respect to 60 hz motors you will need
real power to drive them nothing a micro can do. Something like 20 watts at
some voltage. It all varies from manufacturer to manufacturer.
There was something else on the IBM clocks and don't recall. But I think if
you sent a inverted pulse the clock would go to the top of the hour or was
it that it went backwards.
I suspect there is some good information online.
Regards
Paul.
WB8TSL

On Fri, Jan 3, 2020 at 7:05 PM Jerry Hancock <jerry at hanler.com> wrote:

> Thanks for all the input.  My friend Dave has over 300 International Time
> Recorder master clocks and who knows how many of the old IBM wall clocks.
> The slave clocks take 1 pulse per minute and don’t have second hands so
> they won’t work.  IBM made a wall clock with a second hand and I didn’t
> know until you guys posted that I can drive them with pulses, assuming.  So
> I’m going to talk Dave out of one of those clocks assuming he has a couple
> dozen.  I have a feeling some also used a synchronous motor.  I didn’t
> think about it until now, but I guess I can also use a micro to generate
> the 60hz (against my reference) voltage for the synchronous motor.  Has
> anyone tried that or should I just look for a quartz type only?
>
> > On Jan 3, 2020, at 2:59 PM, Neville Michie <namichie at gmail.com> wrote:
> >
> > Hi,
> > I saw the discussion on PPS slaves and spent some time thinking about
> them.
> > I have, of course used $3 quartz wall clocks as slaves, but they are
> rather poor quality.
> > I remembered that in my collection I had some 40cm dials, probably from
> an observatory.
> > These are all 24 Hour dials, but they contain two alternate polarity
> motor units. One
> > for seconds, the other for hours and minutes. I had run them in this
> mode years ago,
> > they use 24 volts and I had to design a driver, the bi-polar drive being
> achieved by a
> > series capacitor, which was driven by a unipolar square wave signal from
> a GPSDO.
> > I also have a 10” “Chloride Gents” slave with an unusual bipolar motor
> driving worm gears.
> > This is a 12 Hour dial with sweep seconds, driven by a single drive.
> > This clock then poses the question, “if it stopped how do you correct
> the dial?”.
> > There is no clutch and adjusting knob, you cannot touch the hands as the
> bezel is fixed,
> > so you would either have to:
> > (a) set an alarm clock to warn you that the time would be right in a
> minutes time to start the clock,
> > (b) Try to double drive it with 2 pulses per second for up to 6 hours,
> > (c) run it backwards for 6 hours,
> > or dismantle the slave, which is a major task and likely to cause damage.
> >
> > This dilemma explains the use of multiple drives in the slaves.
> >
> > If anyone wants a 40 cm, 24 hour alternate polarity slave without glass
> and probably requiring
> > re-bushing of its pivots (which is why, I assume, that they were taken
> out of service), I have several,
> > for free, but in Sydney.
> >
> > cheers, Neville Michie
> >
> >> On 3 Jan 2020, at 05:21, Jerry Hancock <jerry at hanler.com> wrote:
> >>
> >> Hello,
> >>
> >> I looked around but can’t find a wall clock that would take a 1PPS
> input signal to drive the minutes and seconds.  I’ve made digital modules
> using a lot of different displays but would love to have a large, 14” or so
> with a second hand, wall clock that I can drive with 1PPS.  The old IBM
> clocks, etc I found take a pulse on the minute.  I have an old pendulum
> clock I can drive with a solenoid but thought I would ask here before going
> that route.
> >>
> >> Signal levels aren’t important.
> >>
> >> Thanks
> >>
> >> Jerry
> >>
> >>
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> Jerry Hancock
> jerry at hanler.com
>
>
>
>
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