24-Hour Clocks
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  1. #1
    Member ned-ludd's Avatar
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    24-Hour Clocks

    My obsession doesn't stop at watches. I have 24-hour clocks too.

    This World Time Clock came with a 12-hour movement but today I replaced that with a 24-hour movement so it makes much more sense now.
    Name:  WorldTimeClock.JPG
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    Kitchen Wall Clock
    Name:  WallClock.JPG
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Size:  60.4 KB

    Russian Aircraft Clock on a home-made laser-cut acrylic stand
    Name:  TupolevClock.JPG
Views: 832
Size:  46.2 KB

    Bulova Quartz (with pendulum removed because it chews through batteries)
    Name:  BulovaTripod.JPG
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    (Yes, that's a tellurian orrery in the background.)


    The following are clocks I've made myself.

    Arduino-driven DAC VU Meter Clock (Mk.1)
    Name:  VUMeterClock.JPG
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Size:  64.7 KB

    TTL Binary Clock Prototype (showing 13:23:48)
    Name:  BinaryTTL.JPG
Views: 806
Size:  94.5 KB

    Arduino-driven Binary Clock Prototype (showing 13:41:13)
    Name:  ArduinoBinary.JPG
Views: 813
Size:  66.9 KB


    So what 24-hour clocks do you have that you'd like to show us?
    Last edited by ned-ludd; January 6th, 2018 at 04:48.

  2. #2
    Member Afka's Avatar
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    Re: 24-Hour Clocks

    This is my Italian Perditempo, 46 cm diameter!

    Name:  2018-01-06 13.29.10.jpg
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  3. #3
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    Re: 24-Hour Clocks

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  5. #4
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    Re: 24-Hour Clocks

    Name:  2018-01-06 13.30.07.jpg
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    Soviet marine clock.
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  6. #5
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    Re: 24-Hour Clocks

    Same

    Inviato dal mio moto x4 utilizzando Tapatalk
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    se voglio l'ora esatta, guardo il mio telefono. Se voglio piacere a me, guardo la mia Raketa ...

  7. #6
    Member ned-ludd's Avatar
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    Re: 24-Hour Clocks

    I was quite taken with a Seth Thomas clock that sold for a ridiculous amount on the bay today. I really like the layout with minutes outside the hours and the small inner seconds dial. And that second, green hour hand is a brilliant touch!

    Name:  seth-thomas-military-400x383.jpg
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    The final price was much too rich for my blood so I decided to try and reproduce the face layout and make my own copy/homage of it. For some time I've had the desire to make my own 24-hour clock(s) and already have a selection of hands and a few quartz movements for the purpose.

    In making my VU Meter clock (see my previous post) I re-acquainted myself with the Postscript graphics language to draw the dials. It's been over thirty years since I used Postscript in any seriousness but it's proving very useful for this sort of thing, and works well for creating designs for my laser cutter and CNC router. It's much easier for me to create and tweak a clock face using Postscript than, say, Photoshop, SketchUp or Inkscape.

    Here's my current design for a face that should fit inside an old 240mm diameter kitchen clock case I have saved for the purpose. This example is a 12-up but it's only a minor edit of the PS source to change it to 24-up.

    Name:  seth-thomas-military-repro.png
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    The dials are currently sized for a set of Dauphine hands I have in stock and since there was space around the outside I added the second (UTC) zone in blue. I'm unlikely to stick with that, though, as it shifts by one hour at Daylight savings and to be true to the Seth Thomas I should use an extra hour hand instead.
    Obviously to honour the ST design I should use pear hands but I don't have any of them on hand so shall have to order some and alter the design to suit the lengths of any I get.
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  8. #7
    Member ned-ludd's Avatar
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    Re: 24-Hour Clocks

    Well, the only 24-hour movement I had on hand was a long-shaft, high torque one, which wouldn't fit under the glass in the clock case I had. I'd used the last short shaft movement to upgrade the small world time clock last week. So I couldn't make the ST homage as proposed with material to hand.

    Rather than put everything aside until I acquire another short-shaft movement I was determined to make a clock - any clock - this weekend. So I pulled out some long (160mm/210mm) hands I got with the high torque movement and modified the ST design to suit them. Along the way I made some design decisions I'm quite pleased with, such as a sun and horizon motif and losing the second timezone.

    Yesterday afternoon I had the 460mm(!) diameter face printed on the heaviest A1 paper available. I glued this to 6mm MDF sheet and cut it out on my micro-bandsaw. Then I cut out a 460mm circle of clear 1mm polycarbonate sheet to protect the face. This is held in place around the circumference by longitudinally slit 10mm clear vinyl tubing. A proper case will have to come later - if at all - so for now this means the hands are exposed.

    Name:  clock-24-460mm.JPG
Views: 737
Size:  118.5 KB

    Generally I'm pleased with the result but design-wise I've already made some changes for the next one: such as tighter fitting, larger fonts and larger tick marks on the seconds dial. Also I need to be aware of leaving a larger margin around the outside so the minute figures don't get obscured.

    The only disappointing thing is the high-torque movement:the minute hand is quite sloppy. It lags up to thirty seconds going up then recovers coming down. I have more movements on order so maybe I'll find a better one to fix this.

    Lastly, there's the dilemma of where to hang it: I am very short of wall space at Bachelors Hall!
    Last edited by ned-ludd; January 14th, 2018 at 11:18.
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  9. #8
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    Re: 24-Hour Clocks

    My 24 hour clock

    我從使用 Tapatalk 的 SGP521 發送
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  10. #9
    Member ned-ludd's Avatar
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    Re: 24-Hour Clocks

    I just can't help myself. Here's my new kitchen clock.
    Name:  shepherdgate-600x789.JPG
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    It has two separate quartz movements: one for the seconds and one for the hour+minutes.
    Luckily the movements are silent, or their beat interference and drift would drive me mad.
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  11. #10
    Member ned-ludd's Avatar
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    Re: 24-Hour Clocks

    After some minor repairs and adjustments these mains-electric clocks now grace my home. I put in a dedicated 100vAC/60Hz power supply for them, as they won't work off the local electricity supply of 240vAC/50Hz.

    Numechron Tymeter Model 101 from 1963.
    Name:  numechron-tymeter-100-600x.jpg
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Size:  39.1 KB

    Mastercrafters Model 191 World Time Clock. The perspex cover is off because it needs polishing.
    Name:  mastercrafters-191-600x.jpg
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    The south-polar azimuthal map rotates with the hour hand so you can read world times directly.
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