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Outside dial at last!

 
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Zero



Joined: 21 Apr 2015
Posts: 102

PostPosted: Tue Sep 06, 2016 4:58 pm    Post subject: Outside dial at last!  Reply with quote

Recent reorganization of my workshop storage forced the removal of my 30" GRP dial from an inside wall. Where better to put it than on the gable end? Worries about security are hopefully non-existent as the dial can only be seen from our rural garden. For the insatiably curious the galvanized pipe above the dial supports a large, Met Office type, cup anemometer.



The clock hands are DIY aluminium, counterbalanced with riveted lead sheet and curved both ways for extra stiffness. They used to be on a home made skeleton dial but I found a well-used GRP dial for sale online in the UK. Getting it to Denmark involved generously bribing the next door bike shop to seal it into a bike shipping box for me. The dial arrived safely with a nice bit of "age" on it so as not to look like "new money." I hate newly gilded dials. Laughing

My large dial is driven by a Synchronome No4 turret slave in the same, half minute circuit as my C7, WT and a couple of smaller dials plus a school "bellringer." I'd love a bell striker too but one hasn't crossed my path. I use a mains power supply for the time circuit.  

Plans to eventually drive the dial's hands with the WT via several large, bevel gear sets were shelved since the Synchronome turret slave has proved so reliable over the years. This oversized slave has two large electromagnets and double locking on a 4" ratchet toothed, drive wheel.

Pressing the armature in allows the large wheel to be whizzed round to set the hands near to time. The last few half minutes are usually clicked forwards with the armature to save overshooting.

It has only taken me 50 years to get around to having an external dial. So patience is rewarded after all.  Wink

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Donsayers



Joined: 24 Apr 2015
Posts: 70
Location: United Kingdom

PostPosted: Tue Sep 06, 2016 9:06 pm    Post subject: Reply with quote

Nice! I have a couple of large slave movements waiting for a dial, one Synchronome and one Gents'.

Just waiting for the right dial. Perhaps I will have to make one.
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Zero



Joined: 21 Apr 2015
Posts: 102

PostPosted: Thu Sep 08, 2016 10:54 am    Post subject: Reply with quote

Thanks.

I think the sheer size of my dial is a bit much for that situation.

The upside is that it is incredibly easy to read from indoors. Laughing
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Donsayers



Joined: 24 Apr 2015
Posts: 70
Location: United Kingdom

PostPosted: Wed Oct 19, 2016 6:55 pm    Post subject: Reply with quote

Nah, it's not too big. This is too big:
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Zero



Joined: 21 Apr 2015
Posts: 102

PostPosted: Mon Oct 24, 2016 1:39 pm    Post subject: Reply with quote

Donsayers wrote:
Nah, it's not too big. This is too big:


But it fits the gable perfectly.  Laughing

I suppose he could have cut out an hour segment and concertinaed the dial into a smaller circle?  Wink
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Zero



Joined: 21 Apr 2015
Posts: 102

PostPosted: Sat Oct 29, 2016 8:23 am    Post subject: Reply with quote

Matching the hour hand position to the minute hand is just as important in a turret clock.
Mine kept looking faintly 'wrong' until I checked on the hour and found the slight error.

The Synchronome turret slave has a U-shaped, friction washer, hand retainer on the hour hand pipe.
This allows changes in position relative to the minute hand. The latter fits on a pinned square.

No doubt the 12:1mechanical advantage of an exposed hour hand was better protected against damage by such a "slipping clutch" drive.
The minute hand would never have enough torque to do much harm if it should ever "freeze up."
Most slaves were protected from the weather behind glass.

I am reminded of the downside of the enormously powerful WT mechanism.
Which could do serious harm to its dial drive mechanisms in the event of a blockage to normal hand movement.
One should never underestimate the huge, potential torque applied by even the smallest of WTs.
The same applies to large, motor driven dials of course.

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