No. 4, nearly done

Discussion in 'Clock Construction' started by John MacArthur, Dec 23, 2017.

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  1. John MacArthur

    John MacArthur Registered User
    NAWCC Member

    So here is the nearly final product of the clock construction I have been promising pictures of. The dial and bezel will get silvered and lacquered at the very last, after final mounting in the case. I still have to make several case and bracket screws, again after the case is made, and I know the final dimensions. I have quite a few pictures of the construction processes, which I will post in order as I make the next clock, which I will be starting soon.

    Johnny

    DSCN0889V2.jpg DSCN0865V2.jpg DSCN0880V3.jpg
     
  2. WMello

    WMello Registered User

    Jan 30, 2016
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    Herndon, VA
    Beautiful
     
  3. shimmystep

    shimmystep Registered User
    Donor

    Mar 5, 2012
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    Wonderful work John, enjoyable pictures, thanks.

    Can you talk me through the weight pulley at the top of the movement? Looks great, what was behind that design? As opposed to the conventional way?
     
  4. John MacArthur

    John MacArthur Registered User
    NAWCC Member

    #4 John MacArthur, Dec 24, 2017
    Last edited: Dec 24, 2017
    Thanks, Shimmy. Most regulator clocks go into tall cases, and this is how I had set out to make this one. The weight spools off the drum, and reaches to nearly the bottom of the case. When I was about half done with this one, a friend wanted it, but in a wall hanging case. So I had to add the secondary pulley so that the weight will wind completely to the top of the case, and the fall of it will extend just beyond the bottom of the pendulum. There are quite a few examples of this type of case and setup in 19th cent. English regulators, particularly by Frodsham with gravity escapements, and It was an easy "fix". The old way was to just have it ride on a shaft, as it has to move back and forth as the weight winds up and down on the drum. I added a small rotary linear bearing inside the hub, so that it adds virtually zero friction. If I had designed the clock for a wall case from the beginning, I would just have made it with a smaller weight drum, as in my No. 3 (see web page in my sig file).

    Johnny
     
  5. shimmystep

    shimmystep Registered User
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    Mar 5, 2012
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    I thought that may be why, the picture's perspective doesn't show the space where the weight rises well. Superb quality build Johnny, can I see jewels in the anchor as well?
     
  6. John MacArthur

    John MacArthur Registered User
    NAWCC Member

    Thanks again, Shiimmy. In the test stand, the weight doesn't rise all the way up to the upper pulley, like it will in the final case. Yes, you can see the jewels dovetailed into the pallets. What you can't see are the jewels in the plates at each end of the scape and pallet arbors. Here is a pic of the one in the pallet bridge, before polishing.

    Johnny
    13DSCN0780sm.jpg
     
  7. shimmystep

    shimmystep Registered User
    Donor

    Mar 5, 2012
    3,759
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    Are all the wheels screwed onto to the arbour collets? I like that, very clean. I always feel its a shame after turning a nice new brass collet on an arbour for a wheel, that it gets riveted to fit the wheel!
     
  8. John MacArthur

    John MacArthur Registered User
    NAWCC Member

    Yes, all the wheels and the pallet anchor are screwed onto the collets with #0-80 or #1-72 screws.
     
  9. Paul Madden

    Paul Madden Registered User
    NAWCC Member

    Apr 24, 2017
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    Very nice John. Thank you for sharing!
     
  10. jhe.1973

    jhe.1973 Registered User
    NAWCC Business Donor

    A few years ago my daughter and I had a chance to visit with Johnny for a few hours and we were able to view his MacArthur #3 regulator in person. It is shown on his web site, but photos really don't do it justice. I suspect that these photos of this latest creation of his may also fall short of true representation.

    Angela and I were so impressed with him and his freely sharing his extensive experience that the remaining hours of our trip seemed to fly by.

    I am so glad to see that he found the time to post here. Mostly for those of you who may not be regulars to this forum, Johnny's attention to detail and his input here are among the top of of this craft anywhere.

    Thanks my friend!

    :coolsign:
     
  11. John MacArthur

    John MacArthur Registered User
    NAWCC Member

    Thanks so much for the kind words, Jim. If I get away towards PHX in the next couple of weeks, I'm hoping to drop in.
    Johnny
     
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