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Slow cuckoo train

disciple_dan

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I was wondering what the most likely cause of slow cuckooing might be, it seems to happen often. I have bushed several lower bearings on both plates. I try to get the new bearings large enough and burnished well for low friction. The uppers look to be in good shape. Any ideas? Thanks, Danny
 

shutterbug

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How does it act with the bellows unhooked?
 

Willie X

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DD,
What weights? And, is there any animation hooked to the bellows?
Willie X
 

disciple_dan

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Sorry, I didn't study what was happening while it was on the test stand. I didn't put the lifters in at that time. It seemed to be working fine.
It is cuckoo only with 1200 gm or maybe it is 1260 It is hard to see.
Thanks, Danny
 

POWERSTROKE

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Stiff old bellows. Take them out and clamp them shut.
If it's not that, maybe the weight is wrong, or you need to check the strike train again. Did you polish the pivots and make sure that all the holes are in good shape?
 
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Willie X

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If it's a Regula, 1500gm weights are recommended, although some seem to do just fine on the 1260gm weights that many of the older ones were shipped with. Willie X
 

Vernon

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Thinking that the second bellow is lifting too high. In other words, the sound is lasting too long. Give the lift wire a little more bend.
Vernon
 
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disciple_dan

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Yes, I bushed all of the chain wheel bearings so, on the back, I did SB1, SB3, SB4, and the front SF1, SF2, SF3, and SF4. The fan bearings looked ok. I took it back apart this morning and checked for tight pivots and that's when I bushed SB4. I tested it without the bellows and it seemed fine. The bellows looked to be fairly new and done well. They have a leather hinge and original type cuckoo paper. :???:
Could it be too much lift on the bellows causing the train to never get up to speed? I've watched it quite a few times and it doesn't seem to be a problem. Maybe you can see it in the video.
Thanks for the help. This happens often when I work on cuckoos. Thanks, Danny
 

disciple_dan

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Ok, Thanks, I'll find out what weights the owner has. I didn't keep his weights and I'm using some 1260's that I have here. I'll have another look at that bellow too. Thanks, Danny
 

POWERSTROKE

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1500 is too much if it's just time and cuckoo. The 1360s would be better on a rebuilt movement. I try to get my rebuilds to run on less than 1000g. This way there is plenty of room for error. Also a possibility you have an out of place bushing. The SB2 was ok? I'd double check it if you had wear going up to the 4th position.
 

Willie X

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Yes, 8-Day cuckoo's will have a shorter bellows stroke and usually a lighter slug in the bellows top.

"Leather hinge" doesn't sound right.

Willie X
 

POWERSTROKE

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"Leather hinge" doesn't sound right.

Willie X
I've seen this repair many times. Manufacturers seems to have used a different material for the hinge of the bellows than the rest of the covering many times. In these instances, the material for the whole bellows is usually a whit cloth like material and the hinge that is split is usually a yellowish color and a different material. The cloth cover is usually in great shape and if it is, you can carefully pull back the corners of the cover on the back and put a new tyvek hinge on.
 

disciple_dan

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Yeah, It may not be leather. It just has that yellowish color like some of the older cuckoos had and I was told that it was leather. Either way, It seems to be in good shape.
 

disciple_dan

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Judging from the responses I got this slow cuckoo is not as common as is for me and there's no magic answer. A couple of you suggested shorting the below lift stroke. I did just that and this is the result. The first video is the original post vid. and the second one I did today. I think it's acceptable and will work this way for years to come. That remains to be seen. Thanks for all the great help, Danny
 
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POWERSTROKE

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The speed is fine as well as the lift. I think someone changes the whistles at some point: has a strange tone.
 
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