New haven drop octagon runs fast

[demoman3955]

So I have this clock that wouldn’t run and most in part to the suspension spring rod assembly being too low and hitting the winding arbor .. The suspension spring was barely on it to begin with. I put the spring closer to where it should be and it started running just fine. Problem is, that it runs too fast, and with the bob as far down as it can go, is gaining 5 plus minutes a day. If I put a longer suspension spring on it, the bob will be too low in the case. My only thought is that it’s a movement from another clock that used a longer bob that fit in the case. I’ll see if the links to YouTube work.

 

[Uhralt]

I'm afraid you may be right that the movement is not original to the case. What you could try is to remove material from the upper half of the back of the bob in order to bring the center of gravity down. In addition, you can try to make the upper, flexible part of the suspension (the spring) thinner using sandpaper or similar.

Uhralt

 

[Willie X]

Just make another suspension rod about one inch longer. This will allow you to shorten up the present (to long) pendulum bail and get your clock to a good rate, all at the same time.

I can't see the suspension spring but you may be able to shorten that a bit too. If you can shorten the SS 1/4" that will make your pendulum 1/8" higher, at the same rate. Willie X

 

[demoman3955]

Just make another suspension rod about one inch longer. This will allow you to shorten up the present (to long) pendulum bail and get your clock to a good rate, all at the same time.

I can't see the suspension spring but you may be able to shorten that a bit too. If you can shorten the SS 1/4" that will make your pendulum 1/8" higher, at the same rate. Willie X

yeah i could make a new rod, but im still stuck with the bob being below the window. Ill try making one, which is no big deal. The spring is about 3/4 of an inch long, not counting 1/4 inch where the rod is riveted to it. The clocks not worth the time im putting into it, but its fun and i learn a bit as i go. Ill start to get the hang of things and end up kicking the bucket... lol

 

[Willie X]

On old clocks, it's not unusual for the pendulum to swing low in the case.
Willie X

 

[demoman3955]

On old clocks, it's not unusual for the pendulum to swing low in the case.
Willie X

ok, well id prefer to see it, but in reality, its not like i dont have a couple others anyway, and i do have better clocks that need attention. After looking at it, im thinking i can go with a bit shorter suspension spring, and bend the rod a bit closer to the arbor, and cut the rod a half inch lower, and still be in good shape to get the speed a bit closer.

 

[JimmyOz]

This may work?
The entry pallet goes in long way (nice solid tick) however you can adjust that out a little which should get it going a little faster.

 

[demoman3955]

This may work?
The entry pallet goes in long way (nice solid tick) however you can adjust that out a little which should get it going a little faster.

Its too fast to begin with. Im wanting to slow it down a bit. lol

 

[shutterbug]

You could try a heavier bob. Lowering the mass (center of oscillation) should slow it down a bit.

 

[Bernhard J.]

In addition, you can try to make the upper, flexible part of the suspension (the spring) thinner using sandpaper or similar.

Just as a guideline, what would be the effect? How many minutes a day slower, if the thickness of the spring is half of the present one? I am asking for a really rough estimate. Are we talking about a few seconds a day, or several minutes (without shifting the bob, of course)?

Cheers, Bernhard

 

[Uhralt]

Just as a guideline, what would be the effect? How many minutes a day slower, if the thickness of the spring is half of the present one? I am asking for a really rough estimate. Are we talking about a few seconds a day, or several minutes (without shifting the bob, of course)?

Cheers, Bernhard

I don't think there are any data about this. There are too many other variants involved, like the weight of the bob and the length of the pendulum.

Uhralt

 

[Willie X]

Big clock, very little difference.

Small clock, big difference. Willie X

 

[demoman3955]

Well i think i got it handled. I reduced some of the angle of the second bend and dropped the 3rd bend down to get things lined back up. then i re-bent the hook at the bottom by just a little, which was way too large anyway, and now its looking like its running a tad bit slow, but ill give it a day or 2. its looking like i only needed about 1/4 to 1/2 inch at most. If things go like they seem to be going, ill have to adjust the nut on the bob up, compared to it being maxed out now, which will give me a bit of adjustment either way