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Hermle 400 day clock

HectorLooi

By HectorLooi
in All Things Clocks

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HectorLooi Distinguished Member

HectorLooi

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Ok, I think I got it now. I'll have to put in some sheltered spot to see if it will keep going. The glass dome was missing and I think some draft must have upset the oscillation. 

An anniversary clock is a great way to learn escapement theory. Everything moves so slowly that you can see every step. Drop, lock, full lock, power, unlock.

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oldhippy Distinguished Member

oldhippy

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Unscrewing that won't make any difference to the going of the clock, those holes are not elongated. If you didn't have the movement covered then draft could have caused it to stop. Try and put the clock out of the way, away from everything.    

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HectorLooi Distinguished Member

HectorLooi

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20210323_193558.thumb.jpg.f36560de019b2ff8507ddebea5d8d942.jpg

The holes on this Hermle are definitely elongated. I don't understand why as the pallet has actual adjustable pallets. My Kundo anniversary clock had round holes.

But working on this clock has really deepened my understanding of escapements.

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HectorLooi Distinguished Member

HectorLooi

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1 hour ago, oldhippy said:

I can't recall seeing that before. How stupid is that.  Whatever you do do not adjust the pallet faces. I don't suppose you marked the plate when you removed the first screw. 

Thanks. I'll remember that. I wasn't expecting an elongated hole. It was only when I was putting it back together that I saw it. ?

How would you mark the plate? Would you use a scriber?

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  • 10 months later...
JSM New Member

JSM

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I've got one of these clocks and am having the exact same problem. You have some very good pictures and I see that your pallets span five scape wheel teeth. I cant get mine to span more than four for some reason. I'm told the long number is the movement number and mine is the same. Moving the bridge frame is the normal way to do the last final adjustment. More common on clocks with non-adjustable pallets.

I've made parts for and renovated a good many 400 day clocks and this one is on the point of having me beaten! I've checked everything and can't find the spot between fluttering and jamming. I used to think Koma Midgets were the worst....

Has yours got the proper top block on the suspension spring? ie with a semi-circular cut out? If you have "The Book"I think its 25b

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oldhippy Distinguished Member

oldhippy

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55 minutes ago, JSM said:

I've got one of these clocks and am having the exact same problem. You have some very good pictures and I see that your pallets span five scape wheel teeth. I cant get mine to span more than four for some reason. I'm told the long number is the movement number and mine is the same. Moving the bridge frame is the normal way to do the last final adjustment. More common on clocks with non-adjustable pallets.

I've made parts for and renovated a good many 400 day clocks and this one is on the point of having me beaten! I've checked everything and can't find the spot between fluttering and jamming. I used to think Koma Midgets were the worst....

Has yours got the proper top block on the suspension spring? ie with a semi-circular cut out? If you have "The Book"I think its 25b

In order to know how many teeth between the pallets you need to work out the teeth count to the pinions. Have you checked for wear on the escape wheel and wear on the pallets. Have you got the pallets in the right position. How much space between the pallet forks and pallet bar,  a tiny drop of oil between the two stops fluttering.  

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HectorLooi Distinguished Member

HectorLooi

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6 hours ago, JSM said:

I've got one of these clocks and am having the exact same problem. You have some very good pictures and I see that your pallets span five scape wheel teeth. I cant get mine to span more than four for some reason. I'm told the long number is the movement number and mine is the same. Moving the bridge frame is the normal way to do the last final adjustment. More common on clocks with non-adjustable pallets.

I've made parts for and renovated a good many 400 day clocks and this one is on the point of having me beaten! I've checked everything and can't find the spot between fluttering and jamming. I used to think Koma Midgets were the worst....

Has yours got the proper top block on the suspension spring? ie with a semi-circular cut out? If you have "The Book"I think its 25b

I can't recall. I've since sold off the clock so I can't check it.

But I think everything was original with this clock. I didn't change anything except the suspension wire and getting a new glass dome.

I did manage to get pretty good amplitude from this clock after playing around with the pallet depth and getting it in beat.

With your vast experience with 400 day clocks, I'm sure you'll figure it out.

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