Shaping a pendulum hook

Simon Holt

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I've just taken in a Kienzle wall clock for a service, and I don't like the shape of the hook at the top of the pendulum:

WIN_20210608_18_18_48_Pro.jpg
Looks like it's been squeezed shut at the top.

This hook hangs on a fairly typical hanger:
WIN_20210608_18_22_39_Pro.jpg
It seems to me that there will be a less-than-perfect contact between the two, with the potential for the pendulum to rock on the hangar.

Before I reshape it though, what do you all think?

Simon
 

Willie X

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Feb 9, 2008
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I think it was designed and made that way.

The folded over (upper part) of the hook should be a snug fit in the upper part of that rectangular leader hole, when the pendulum is in its normal running position.. This should minimize any lateral movement.

Willie X
 
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shutterbug

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If you reshaped it, you'd gain 1/2" or so on pendulum length that you'd have to be able to adjust out too.
 

Simon Holt

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Adjusting a clock holds no fear for me now that I've built one of Luke Mester's timers!

My main concern was that the pendulum wouldn't necessarily be a 'snug fit'. The way the hook has been squished closed at the top may have resulted in a non-horizontal contact area, which could allow the pendulum to rock on the hanger at each end of the swing, thus robbing power.

Anyways, the clock is on test now with no changes to the hook. If it runs for 8 days then it's good to go.

Incidentally, this is a three-train clock with only two springs - first I've seen.
PXL_20210609_111300530.jpg
Thanks for the input guys!

Simon
 

Thomas Sanguigni

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Simon, Is that an ISGUS German movement? I know you said it is a Kienzle, but look at my photo of an ISGUS. The time and strike would be on one spring and the Westminster on the other. If you disassemble the springs, would you let me know the size of the time/strike side spring? I've worked on one of these, and they can be difficult. Mine had a replacement spring in the time/strike side and it was a bit under-powered.



Post some more photos please.

004.JPG
 

tracerjack

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I also think the hook does not need reshaping. The radius of the hook end looks even. Were it originally larger, with the usual gap, I would think the radius would get more pointed from being smashed.
 
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Willie X

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Simon,

Did you read post #2. The hook was made that way (at the factory) for a reason.

A photo from the side, with the pendulum in place will tell me if and where the hook may have been buggered up.

I'm thinking that the lower (pendulum part), in your photo, was originally completely flat. This would allow the uppet (hook side) to lock into the rectangular hole in the leader eye.

Leaving well enough alone may be your best option. Brass gets brittle with age and that's a factory bend there at the top, probably done hot.

Willie X
 
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Simon Holt

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Did you read post #2. The hook was made that way (at the factory) for a reason.

A photo from the side, with the pendulum in place will tell me if and where the hook may have been buggered up.
Indeed I did Willie, and thanks again. Your advice was why I left it alone. Here are some pictures of the leader (with and without the pendulum, to give you an idea of how deeply the pendulum hook sits in the leader):
WIN_20210610_08_54_07_Pro.jpg WIN_20210610_08_54_39_Pro.jpg WIN_20210610_08_54_47_Pro.jpg WIN_20210610_08_55_35_Pro.jpg WIN_20210610_08_55_42_Pro.jpg

Simon, Is that an ISGUS German movement?
Actually, it's a DUFA:
PXL_20210610_075131568.jpg WIN_20210610_08_52_41_Pro.jpg
The confusion arises (my fault) because Kienzle acquired DUFA in 1929/30, but continued to use the DUFA branding for a while after.

I won't be able to give you spring dimensions - I'm not planning on doing a strip-down on this one, because the owner had put it into storage after an overhaul and only wanted me to 're-commission' it back into service. He hadn't been able to keep it running but that may have been a combination of being out-of-beat coupled with the fact that the pendulum leader was rubbing against the back of the slot in the pendulum crutch. It's on test so if it goes for 8 days he can have it back.

Simon
 

Thomas Sanguigni

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That certainly is a twin sister to the ISGUS. There must be some correlation. There are lots of power robbing issues you may encounter. Hopefully, your time/strike spring has not been molested.
 

Willie X

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Simon,

I think the oddly made hook is serving it's intended purpose well enough as is. :)

Nice photos,. Willie X
 

MuseChaser

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It almost looks as if that bend was made to shorten the length just a bit to bring other rate adjustments within range. Is that possible, Willie?
 

Willie X

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Who knows ...

The two little tabs, at the bottom of the leader, are often bent forward to stabilize the pendulum rod too.

I think all clock companies (then and now) were in a constant state of change, to make their clocks cheaper and hopefully better, or at least no worse!

Willie X
 
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