Cuckoo Cuckoo strike irregular at 10 thru 12 ooclock

[Michael L&M]

Have many hours on Granma’s cuckoo.
I would like to know movement make, photo attached. No markings, but ink stamp on case “Made in Germany”.

The strike at 10 or 11 or 12 will have an added strike, of course it then loses the half hour strike.
It will add the strike at the beginning when it should be the half hour strike and sometimes at the end of the strike.
Again this is only at large hour strikes.

What I do see is the phasing of the count pawl shifting as time increases.
I attached a photo of the 2:30 strike and the end of hour strike is at the leading edge of slot and end of the half hour at the trailing end of slot.
I also attached a photo of the 9:30 strike which is shifting to the middle of the slot.
By 10:30-11:30 strike the pawl is well into the center of the slot.

I cannot figure the phase change.
Also having extra strike on the hour when the pawl is still in the slot like the stop pin is not engaging And only at large hours.

When this arrived the stop pawl was barely grabbing the pin so I machined the cam .020” only at the stop position to drop the pawl to better engage the pin.

Thanks, Michael

 

[POWERSTROKE]

Not sure what you're saying. What is it doing at 10, 10:30, 11,
11:30 and 12
I despise countwheels compared to rack and snail.
Not sure what your problem is, but it sounds like you need to adjust the countwheel counter clockwise a bit

 

[Willie X]

Also, the count finger should point to the center of the count wheel. Yours is canted to the left a good bit.

The count finger should tap the single 2:00 tooth dead center.

Willie X

 

[Michael L&M]

Not sure what you're saying. What is it doing at 10, 10:30, 11,
11:30 and 12
I despise countwheels compared to rack and snail.
Not sure what your problem is, but it sounds like you need to adjust the countwheel counter clockwise a bit

The countwheel is geared so one tooth movement will eliminate a strike, either hour or half hour.
The hour strike end when pawl falls on trailing (left side of slot) the Hal hour ends at leading (right side) of slot.
The 2 photos are the end of half our strikes.
The photos are annotated of which half hour.
The 2:30 strike ends correctly, The 9:30 strike is shifting to the left.
This leftward shift continues and eventually you will get an added hour strike. It is only once and could be at 10 or 11 or 12.
Then beginning at 1 o’clock it strikes correctly and starts the shifting process again.

It acts like the count wheel is incorrect as all slots are the same width.

Did I make sense?

 

[Michael L&M]

I will send a video tomorrow when at the shop where my YouTube password is.

 

[JimmyOz]

read #3 till you understand it " dead center"

 

[Jeff T]

the count lever needs to point to the center arbor of the wheel like willie said and you may need to adjust to the teeth one way or the other to get the count right its just a accumulation of error building up that makes it get out of time

 

[shutterbug]

Sure, the center of the wheel. Meaning it needs to be straight with the edges of the grooves as well. Your picture shows it hitting canted, as Willie mentioned. But it also shows it at the center of the slot. On your count wheel, it needs to hit the front of the slot at the end of the hour strike, and then hit the back of the slot at the 1/2 hour. Unless that is corrected, it will continue to miscount. If you get it straightened out, and then set it to hit dead center on that narrow tooth like Willie explained, you should be good.

 

[Michael L&M]

I only have Saturday for this therefore the delay.

I made the pawl centered/tangent to the wheel.
I now have the count wheel/pawl in a position that is about one-half of a pinion tooth incorrect.
In other words I need 1/2 a pinion tooth to locate the pawl correctly on the count wheel.

I still have the movement in the case so it has to be removed to rectify the pawl position.

Meanwhile my strike wheel has to rotate about 1/2 tooth to put it in the “do nothing” position.
My lack of experience shows I need to mark that position in the case with all the rods attached.
That will also give me about 1/2 a tooth on the pinion for the count wheel.
This has the ratchet wheel solid to the strike wheel and this pinion drives the count wheel.

I feel I am making this too complicated thinking that assembly at the factory cannot have a complicated assembly in production as the factory would go broke.
Maybe they have jigs, tools, etc. to assemble at the factory for hourly workers in a production line as cuckoo movements are relatively cheap.

 

[Vernon]

Try repositioning the count wheel by loosening the screw that holds it on.
Vernon

 

[POWERSTROKE]

I just did one and the return spring was missing off the count lever. Put one on and it's dandy now. Had me stumped for a bit.