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  1. S

    Solved Modifying Hermle chime pattern

    I agree, the Westminster chime is timeless (pun intended). My modification plays the "main" 16 notes of the melody at each hour, and plays the 4-note descender at the half hour. So still Westminster at the hour but omitting the 15m and 45m soundings.
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    Solved Modifying Hermle chime pattern

    The way to understand the modified count cam is to remember that it is now triggered at half hour and hour, not every quarter, because of the modification to the center lift. The 30 minute activation is 4 notes (1 measure), and the hour activation is 16 notes (4 measures). That is a...
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    Solved Modifying Hermle chime pattern

    For striking hours only, you could remove one of the gears that drive the chime drum. The chime cycles would still run (needed to trigger the hourly strike) but it would no longer activate the hammers. But that would *strike* only at the hour, not chime+strike at the hour.
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    Solved Modifying Hermle chime pattern

    I'm a bit surprised at the lack of response to this. Maybe y'all are being polite about how ugly the modified cam is? Cheers, -Steve
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    Mantle clock chimes

    I've updated the other post with full details.
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    Solved Modifying Hermle chime pattern

    That's the entirety of my modification. The most difficult part is reworking the chime count cam; I wonder if a 3D-printed part could work here. The cam following forces probably won't erode a plastic part too quickly, though I worry a bit about the strike uplift ramps-- there's some force...
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    Solved Modifying Hermle chime pattern

    Speaking of the backside of the chime count cam, I next attended to the chime correction notch. The left side shows the underside of the original count cam, which rotates counter-clockwise as photographed. The inner cam has a single notch, into which a chime correction lever drops upon...
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    Solved Modifying Hermle chime pattern

    Here's how I created the modified count cam. First I cut a notch to match the one 180 degrees opposite. Next I fashioned a bridge from 1mm brass sheet and epoxied it to the original cam plate; the thickness of the epoxy on the top plate of the cam is of no concern because the top of the cam is...
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    Solved Modifying Hermle chime pattern

    The next step is to reprogram the chime count cam: The left side shows the original chime count cam, and the right side shows the altered cam. In the unmodified movement, the release cam activates the count cam every quarter hour. The count cam rotates clockwise, and drops the chime shut-off...
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    Solved Modifying Hermle chime pattern

    The first change is to the chime release cam: The left side shows the original release cam, and the right side shows the altered part. With this change, the chime train is triggered at the hour and half hour, instead of at every quarter-hour. Note that the hour lobe is taller than the other...
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    Solved Modifying Hermle chime pattern

    The chime pattern modification involves modifying two components: the four-lobed chime release cam mounted on the center arbor, and the chime count cam. By replacing these with modified parts and keeping the originals, I can easily restore the factory chime sequence. The modification also...
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    Solved Modifying Hermle chime pattern

    The original chime/strike sequence as described in the Hermle service manual is: ¼ hour: 1 2 3 4 ½ hour: 3 1 2 4 3 2 1 3 ¾ hour: 1 3 2 4 4 2 1 3 1 2 3 4 hour: 3 1 2 4 3 2 1 3 1 3 2 4 4 2 1 3 STRIKE After my modification, the chime sequence becomes: ½ hour: 1 2 3 4 hour: 3 1 2 4 3 2...
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    Mantle clock chimes

    I've figured out how to do this. See this posting for details.
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    Solved Modifying Hermle chime pattern

    I'm enjoying my mantel clock with Westminster chimes (Hermle 340-020 movement). After some time I've come to feel that its chiming every quarter hour is a bit much, so I was wondering if I could have a short chime at the half hour, the full chime/strike at the hour, and no chime at 15 and 45...
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    Adjusting Escapement beyond user allow....

    The regulation on a hairspring balance is achieved by changing not the length of the hairspring, but instead constraining how much of the hairspring is free to flex as the balance wheel oscillates around its resting point. In your first photo, the (photo-wise bottom of the) adjusting lever...
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    Mantle clock chimes

    Me too-- my preference would be a short chime at 30 minutes and the full chime and strike at the hour, meaning simply locking the chiming hammers up would not work (wouldn't get the short chime at 30 minutes). I'm looking into modifying the Hermle 340-020 to accomplish this; if anyone has...
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    How do you regulate a cuckoo clock?

    Here's a simple trick I found: cut a large paperclip to obtain a tall U-shaped wire and clip it to the pendulum stick behind the bob. Moving the paperclip up or down the stick yields a much finer change to the running rate than sliding the bob itself. This lets me easily regulate my 8-day...

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