An NSR Absolute Block instrument

Discussion in 'Miscellaneous & Oddities' started by Andy_Sollis, Aug 5, 2023.

  1. Walkingthedog

    Walkingthedog Full Member

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    Ah I see. I can get 5litres of white vinegar for about £6.
     
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  2. Andy_Sollis

    Andy_Sollis Staff Member Moderator

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    Doing my best The only thing that may not remain original will be the front face with will have to be redone, probably with a transfer
     
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  3. Andy_Sollis

    Andy_Sollis Staff Member Moderator

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    Hmm, WD40 has only had limited success.

    Other parts were soaked in original brand coke, but didn't give brilliant results. White vinegar may be a good shout on that !
     
  4. Andy_Sollis

    Andy_Sollis Staff Member Moderator

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    Over the past few days I’ve been having limited progress.. until last night. Wife on nights and Zack fell asleep just after 7pm so after half hour working on something on the computer I opted to remove the door from the block instrument and work on it away from everything else. It’s all got to come apart for the wood to be cleaned anyway.

    I then begun the big strip down - here follows a number of my reference photos for knowing how things go back together, and a little bit of a light bulb moment!
    IMG_7872.jpeg
    first to be removed was the sprung lock that prevents the whole selector disc being rotated backwards - split pin and washer secure. IMG_7873.jpeg
    And removed
    IMG_7874.jpeg
    at the bottom is a bar and spring that is behind the lower plunger. This is the release bar to allow the selector wheel to rotate. IMG_7875.jpeg
    Another selector arm. This is a drop lock. Again split pins!
    IMG_7876.jpeg
    and the side panel metal work removed… now here is where the unexpected occurred when the silver drop lock and metal work around it was removed, it allowed the selector plate to move forward on the shaft as it was still under spring tension - and then this showed up! A collar and securing screw!!!
    IMG_7877.jpeg
    So now I can start to strip this section down
    IMG_7878.jpeg The inside is a screw collar. Pliers in the two opposite holes and twist. IMG_7879.jpeg
    Screw out in the other side and all comes apart. Simples!! IMG_7880.jpeg
    The selector plate from the front. IMG_7881.jpeg
    Everything on the tray. Ready for some refurb!

    Another night.
     
  5. Andy_Sollis

    Andy_Sollis Staff Member Moderator

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    work has started on cleaning back the door.
    IMG_7887.jpeg
    This is before I did any cleaning. IMG_7888.jpeg
    To be fair, doesn’t look much different after cleaning in camera but to the naked eye it’s much better after a gentle sand and wire wool and wipe over with meths.
    IMG_7889.jpeg

    And this is the inside. Much better than before as it had some horrible marks on it.

    I think it may need a little more gentle cleaning back to get it somewhere close to the new upper structure (if the shellac hasn’t stained it of course!)

    that just leaves the main body to clean back and prep and we’re ready to start new shellac and assembling.
     
  6. Andy_Sollis

    Andy_Sollis Staff Member Moderator

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    Woodwork
    Thursday night I had 4 hrs to myself, so after a quick trip to grab some more paper for sanding, I set to on cleaning back some of the wood ready for a new coat of Shellac.

    here are the before photos of the main body.
    IMG_7895.jpeg IMG_7896.jpeg IMG_7897.jpeg IMG_7898.jpeg

    And these are of it afterwards.
    There are still a number of dings and dents. They will remain mostly as it just gives it some patina.
    IMG_7900.jpeg IMG_7901.jpeg IMG_7902.jpeg IMG_7903.jpeg IMG_7904.jpeg
     
  7. Andy_Sollis

    Andy_Sollis Staff Member Moderator

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    Metal work


    I then progressed on with the whizzy wheel on the end of the dremel (or whatever brand mine may be but you know what I mean) to polish off some of the years of crud in the brass work on that central plunger/selector wheel.
    IMG_7943.jpeg
    quite good but don’t last long. Thankfully I have a fair sized bag!

    IMG_7906.jpeg
    before. The outside casting for the plunger.
    IMG_7909.jpeg
    and after.

    IMG_7910.jpeg
    by comparison .. the next bit compared ti the last bit.
    IMG_7911.jpeg
    half way through.

    IMG_7912.jpeg
    and done. Next may be some painting of the black back side of the selector dial.

    still not sure what to do with the damaged lettering. May have to be a transfer.
     
  8. Mossy

    Mossy A classic grump Yorkshire man Full Member

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    Would be pretty simple to add a replacement transfer to the big one I drew if you want me to do so and there's plenty of room so it would come cost free. Just supply dimensions et al.
     
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  9. Andy_Sollis

    Andy_Sollis Staff Member Moderator

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    Am working on it... keep you posted.
     
  10. Andy_Sollis

    Andy_Sollis Staff Member Moderator

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    The replacement bell stand has arrived from Peter..

    IMG_7685.jpeg
    as dispatched, very dark and tarnished..

    quick -15 mins with the whizzy wheel in the dremel, and shiny! IMG_7973.jpeg and in its intended location..

    IMG_7974.jpeg

    The bell will move to this new support, the down side and surprise is that they are not both the same thread. So I can’t move the knob from one to the other. The base is also much more smaller in diameter compared to the original. What I may do now with having gained this additional part rather than having a new one made is I may use the old one as the hammer rest as it has the screw thread in it already and just cut it down and have the top reprofiled in a lathe.
     
  11. chigley

    chigley Full Member

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    ding dong
     
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  12. Andy_Sollis

    Andy_Sollis Staff Member Moderator

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    The time came on Sunday evening to have a try with the spare trim at making the beading for the glass front.
    IMG_8057.jpeg From the end, the one on the left is mine, the one on the right is a sample supplied to match to.. I’m a little wide I think.

    not bad to say this was actually done with a sanding pad disc on an angle grinder! Probably a little too heavy for the task.
    IMG_8058.jpeg
    but it doesn’t look bad.
    IMG_8059.jpeg IMG_8060.jpeg And the fitment is quite good too!

    Finally, it had a day out and was back in a signal box for a few hours..
    Thanks to Dominic for this photo.
    IMG_8061.jpeg
     
  13. Andy_Sollis

    Andy_Sollis Staff Member Moderator

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    Just to add to my fun (yes I am looking to recreate half of a block shelf by the looks of it!) I’ve decided to acquire a telephone that will sit with the block and bell when all restored.
    IMG_7999.png
    as advertised on eBay. Cost me £30 + £7 p&p, so can’t complain. IMG_8069.jpeg
    Some minor soldering to do. IMG_8070.jpeg
    Wiring diagram IMG_8072.jpeg
    The handset isn’t connected.. more on this later.. IMG_8073.jpeg
    Where the handset should connect. IMG_8074.jpeg
    All this for when you lift a receiver! IMG_8075.jpeg
    Some more gubbins! IMG_8077.jpeg
    Trembler bell mech, but missing the actual trembler. Hopefully I have a friend with spares. IMG_8080.jpeg
    Where some bits are missing from. IMG_8082.jpeg
    Diaphragm from the ear piece.

    More in next post
     
  14. Andy_Sollis

    Andy_Sollis Staff Member Moderator

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    inside the hanset, this is inside the ear piece under the diaphragm
    IMG_8083.jpeg

    IMG_8085.jpeg
    this is the microphone part, IMG_8086.jpeg
    As it’s red, I’m guessing it’s come from another phone. IMG_8088.jpeg
    See if I can save this rather than replacing.
    “Listen before ringing”. IMG_8090.jpeg
    A photo from Peter of what a complete trembler bell insides should look like.
    IMG_8084.jpeg
    Now, back to the handset. This is a microphone end and apparently mine is the wrong hand set, which probably accounts for why it’s not wired in and is a bits. As you can see, it’s only 3 terminals. IMG_8102.jpeg
    where as the one Peter has has 4!

    so guess what’s in the post! We have also found that for about £9, you can buy replacement original braded cords, so one may be on the cards in future.

    https://telephonelines.net/index.ph...ducts_id=406&zenid=8m24oiltr2522ugelh1valltl7

    more as we progress!!
     
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  15. Andy_Sollis

    Andy_Sollis Staff Member Moderator

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    Just a few other photos from the original vendor so you have a reference for what I started with.
    IMG_8081.jpeg IMG_8087.jpeg IMG_8006.jpeg IMG_8005.jpeg IMG_8003.jpeg IMG_8002.jpeg
     
  16. Walkingthedog

    Walkingthedog Full Member

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    Some of those pictures take me back to my apprenticeship with the GPO telephones.
     
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  17. Andy_Sollis

    Andy_Sollis Staff Member Moderator

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    Any help/advice always welcome..
     
  18. Walkingthedog

    Walkingthedog Full Member

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    If only. That was 58 years ago. Just recognised the handset parts and relays etc.
     
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  19. Keith M

    Keith M Staff Member Moderator

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    As an Electrician, I have to smile at the 'Strain relief', the knotted flex through the hole in the side panel! I doubt that would be 'original', or at least I'd hope not.:giggle:
    Keith.
     
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  20. Vinylelpea

    Vinylelpea Full Member

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    Nice addition too your collection. Should look good when you work your magic on it. :thumbup:
     
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