Old Gilbert mirror side. Help

wow

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Got in this one with a strange fly that is missing something. Looks almost like a 70’s Korean movement fly with the cup on one end. Never had this movement before. Patent 1884. Somebody tell me what the fly is supposed to look like please.

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Willie X

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I don't know of a good way of repairing the old brake mechanism. I remove the old drum and use a regular fly. This will work fine but you will need a fly that occupies all of the available space.
Willie X
 
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wow

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John Arrowood

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The Gilbert fly worked as a centrifugal governor; as the strike train started running two shoes with leather on one side spread out and rubbed against the sides of the cup and regulated the speed of the fly. I ruined mine by putting the fly in an ammoniated cleaning solution which destroyed the leather in a couple seconds or less.
 

wow

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The Gilbert fly worked as a centrifugal governor; as the strike train started running two shoes with leather on one side spread out and rubbed against the sides of the cup and regulated the speed of the fly. I ruined mine by putting the fly in an ammoniated cleaning solution which destroyed the leather in a couple seconds or less.
Thanks, John. Yep, the Koreans must have copied it. Their shoes are made of plastic and tear up easily. I have one in my shop that has a black rubber thingamajig inside the cup that is split and expands with centrifugal force braking the arbor. When it gets old, however, it gets brittle and does not expand. Junk!
 

wow

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Well, here’s what I did. Decided to keep the cup and make a fly that extends inside the cup. I used the original arbor. It works fine. A little fast, but many of the older clocks had fast strike trains, so it should be ok. The filthy movement cleaned up well. Actually very little wear. Only four bushings needed.

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Willie X

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If you loose the little drum, you can add a little more fly. Even with max surface area it will still a little fast. I just back off on the windup a bit.

Next one I do, I'm going to experiment with little spring arms running in line with the arbor.

Willie X
 

wow

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If you loose the little drum, you can add a little more fly. Even with max surface area it will still a little fast. I just back off on the windup a bit.

Next one I do, I'm going to experiment with little spring arms running in line with the arbor.

Willie X
Hey, I like that idea, Willie. The stops are still on the clock and the springs look like original heavy strong springs. I’m gonna try setting the stop at about 3/4 wound and see what happens. I hate to do away with the cup since it was part of the original patent and rare. Who knows…… some ambitious repairman may want to try and make the little brakes 50 years or so from now when I’m long gone.
 

wow

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Can you tighten up the springy part? It might slow down some. Most Korean clocks I have repaired tend to keep very good time. They certainly are not a great quality.
Can you tighten up the springy part? It might slow down some. Most Korean clocks I have repaired tend to keep very good time. They certainly are not a great quality.
Thomas, the springy parts inside the cup are missing. Is that what you are talking about? I thought about using some from a Korean movement but opted for the fan only. Actually it is not much faster than most old American movements. I’ll try the stop set thing and see what happens.
 

shutterbug

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I wonder if parts of a watch mainspring might provide enough braking action against the sides of the can?
 

Thomas Sanguigni

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Will, I meant the spring that the arbor passes through. Push it down a bit more. It may help to slow the fan during operation. Try to reduce the slip on the spring. I worked on a ST hip movement once. The previous owner wanted a slower strike. They bent the tips of the fan inward to catch more air. The fan on a hip movement is larger, but more friction will slow your strike. I restored the hip movement fan to its original condition.
 

wow

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Upgrade: I just didn’t like the rapid strike so I made two little brakes and added them to the fly inside the cup. The centrifugal force created by the fly turning causes the little plastic balls to brake on the drum. Kinda like old time drum brakes. Slowed it down perfectly.

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wow

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Very interesting Will! It looks like an item in clock vendor's catalog. Can you post a video of that?
Thomas, I already have it back in the clock. If I have to remove the movement for some reason I will make a video. It is very much like the patent posted by Steven above and I have worked on several Korean movements that had a brake similar to mine without a fly.
Will
 

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