Hourly strike at half hour

[eemoore]

I am restoring a Junghans A-!2 movement and all is well except on the half hour the clock will strike the next hour instead of just the half-hour strike.It will strike the hour at 12 and at 6. It has a count wheel. I can't post a picture right now, but can anyone give me some advise as to what to look for. Thanks for your help.

 

[Thomas Sanguigni]

Definitely post some photos of the count wheel. You could have a few different problems. There could be bent teeth on the count wheel which can cause skipping. Make sure the count wheel hook is not bent, it sits centered in the count space, and is even on all sides. Watch closely as the movement counts through all phases.

To make adjustments use smooth jaw pliers. You do not want to damage any teeth. Reset the hands, watch closely, and exercise your patience muscle.

 

[novicetimekeeper]

striking the following hour at 6 and then again at 12 is Dutch striking. Are you sure it isn't supposed to do that?

 

[DeanT]

I suspect photos will help you get an answer.

 

[eemoore]

striking the following hour at 6 and then again at 12 is Dutch striking. Are you sure it isn't supposed to do that?

Well, I'm not sure, I have never heard of that, but I will look into it. There is a double armed cam on the center arbor that lifts the lifting lever that sets everything in motion,I think about every 30 minutes. I will have have to take the face off again and take some pictures. thanks for you help.

 

[eemoore]

Definitely post some photos of the count wheel. You could have a few different problems. There could be bent teeth on the count wheel which can cause skipping. Make sure the count wheel hook is not bent, it sits centered in the count space, and is even on all sides. Watch closely as the movement counts through all phases.

To make adjustments use smooth jaw pliers. You do not want to damage any teeth. Reset the hands, watch closely, and exercise your patience muscle.

Thanks for your help. Is the counting lever the same thing as "the hook". I will try to get some pictures posted soon. thanks again.

 

[eemoore]

I suspect photos will help you get an answer.

thanks, yes I will try to get some pictures posted soon.

 

[novicetimekeeper]

My Dutch striking clock has two bells and two hammers with a cam that moves the hammers to contact the pins. If it is countwheel strike then identifying Dutch striking is easy because of the number of slots in the countwheel.

 

[shutterbug]

If the count is consistent, and it always counts the correct hour then it has to be designed that way. Otherwise it would be counting the wrong hours and getting progressively worse.

 

[eemoore]

thanks for the advice. I was able to adjust the lever a little so that it fell into the counting wheel slot better at the 12 position and now it will strike on the hour correctly and again strike once on the half hour. I didn't think it was a Dutch striking clock since it has only a coil metal gong. I have added a picture showing the strike lever in the count wheel. thanks again.

 

[novicetimekeeper]

The countwheel only has the normal number of slots so not dutch striking as you say.