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Clock components on offer

 
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John_BS



Joined: 19 Feb 2016
Posts: 2
Location: Croydon

PostPosted: Fri Feb 19, 2016 11:12 pm    Post subject: Clock components on offer  Reply with quote

I have an operational Gents HIPP toggle clock, although its timekeeping is (by the standards of this forum) appalling. I  am told by a horologically-knowledgeable friend that this is probably a function of the clock being fixed to a wooden partition.

I also have some parts of what may be a kit clock, manufactured by someone with superior metal-working skills.  I'm not sure how it was supposed to be configured, as the arrangement shown in the photo would require the electro-magnet to be permanently energised (to keep the drop-arm clear of the impulse ramp). The escapement wheel has 15 teeth, but the pendulum period is shorter than 2 seconds.  There are two bobs, the larger weighing c 5kG.  If anyone would like this to play with, it's free of charge, but posting might be a tad expensive.

John





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hugozair



Joined: 21 Apr 2015
Posts: 134
Location: near Penzance UK

PostPosted: Sat Feb 20, 2016 9:21 am    Post subject: Yes Please Reply with quote

John..Welcome to the forum ! While I'm in my permanent electric clock making phase these parts look to be a gem - for the start of my next project for which I have begun assembling timber for the case..I would be more than happy to have those interesting parts. If successful would continue by PM ..Roger

www.rogerj.co.uk/clock.htm
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John_BS



Joined: 19 Feb 2016
Posts: 2
Location: Croydon

PostPosted: Sat Feb 20, 2016 10:52 am    Post subject: Reply with quote

Roger: PM sent.

John
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hugozair



Joined: 21 Apr 2015
Posts: 134
Location: near Penzance UK

PostPosted: Fri Nov 04, 2016 9:55 am    Post subject: Reply with quote

John..With winter rapidly approaching thoughts turned to the clock parts you kindly gave me. You may be interested to know that the clock is based on an article published in the Model Engineer in 1958. It was named the Jubilee Clock.
The design was re-visited in 1962 when John Wilding (who I think has published several clock designs) completely re-designed the impulse system to the one in the example we have here. Impulse is given by the upward action of the arm to the underside of of the pallet.
Later, in 1965, it was looked at again by H H Knie who expressed the view that the contact making would probably have been better with the original Hipp Toggle (as in PO NO36) I agree !
There were no ball races in the original design.. the pendulum suspension by ball race must have been am "improvement" by the maker..I'm still considering how to complete it..
Roger
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Zero



Joined: 21 Apr 2015
Posts: 102

PostPosted: Mon Nov 07, 2016 6:30 am    Post subject: Reply with quote

It isn't obvious from the images [so far] how the pendulum swings from side to side.

As in: Bearings? What bearings?  Very Happy
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hugozair



Joined: 21 Apr 2015
Posts: 134
Location: near Penzance UK

PostPosted: Mon Nov 07, 2016 11:00 am    Post subject: Reply with quote

Hi Chris...The bottom picture in #1 shows there is no spring...just an arbor.. I haven''t disassembled it to see but I'm sure there is a ball race in there..
Also the count wheel has ball races top and bottom and as well as the arm carrying the armature...
The impulsing action seems very odd but it must have worked..I may give it a try when it's finally fitted in a case..
I found out what it was by posting pictures on the ME forum..
Roger
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Zero



Joined: 21 Apr 2015
Posts: 102

PostPosted: Tue Nov 08, 2016 6:06 am    Post subject: Reply with quote

I can see it now.

The pivot pin runs back to front.

I believe theory favours a flexible spring to [slightly] combat circular error.

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