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Grandfather Clock Moon Gear Installation

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Grandfather Clock Moon Gear Installation

Grandfather Clock Moon Gear Installation is as follows. The moon phase function is only run by one gear. The gear is known as a Moon Gear. It sits behind the dial on the same tube as the hour hand. It is easy to remove by loosening the set screw so it will slide off.

Grandfather Clock Moon Gear Installation

The moon gear gets put on the new movement at close to the same place it was on the old one. Trick is to only have it align with the gear behind the dial that it is to engage with. As long as the two engage, that one moon gear will spin the gears on the back of the dial. This will turn the phase of the moon over time.

If the clock stops after a short time with the dial on, it is possible that moon disk is not turning freely. Of course this is not the fault of the movement, but in the dial alone. The lunar disk is like a saw with the teeth. There is a flat bar that keeps it from spinning more than one tooth at a time. The brass or bronze flap that presses against the saw tooth looking edge of the moon disk should not put a lot of force against the moon disk. It does not need to take monster truck force to spin that disk. The bar only needs to stop it from spinning more than one tooth at a time.

The adjustment for this, if it were to happen, is to just bend it back some so there is not as much tension.

Grandfather Clock Moon Gear Installation

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Edward Querfeld
Edward Querfeld
2 years ago

Hello- I recently purchased a Hermle 1161-853 & a Hermle Moon Dial to go with it. I ordered the Moon Dial Gear separately and there were some small hairpin cotter pins that came with. Are those to be installed on either side of the gear on the main shaft? Thanks, Ed

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James Stoudenmire
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James Stoudenmire
2 years ago
Reply to  Edward Querfeld

No cotter pins needed for the moon gear, it has a set screw. If there is cotter pins it is not needed on yours as it is only to lock in the dial to the movement.,

James Stoudenmire
40yr Clockmaker
Author of Clockworks.com

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Carson Bailey
Carson Bailey
3 years ago
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Now I can get my moon dial gear in thanks.

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