Howard Miller grandfather chime timing-Help

[mikehutson]

I am working on this HM single chime grandfather clock and I do not understand the chime timing. It has three pointed lobes and one long lobe. The lobe before the long lobe lifts higher. For the hour? Then two shafts with cam lobes inside the plates. I should have documented better, but I thought I understood how it all worked together. The cam for the 1/4, 1/2, 3/4 and 1 hour chimes is not installed in the pic.

 

[NEW65]

The component with the three lobes that you refer to, is called the chime flirt. Or chime lift. This is lifted by the star cam on the centre arbor.

 

[mikehutson]

I am working on this HM single chime grandfather clock and I do not understand the chime timing. It has three pointed lobes and one long lobe. The lobe before the long lobe lifts higher. For the hour? Then two shafts with cam lobes inside the plates. I should have documented better, but I thought I understood how it all worked together. The cam for the 1/4, 1/2, 3/4 and 1 hour chimes is not installed in the pic.

View attachment 644346 View attachment 644347

New65, I was wondering about the lobes on the star.

 

[shutterbug]

The highest lift will be on the hour. That is required to overcome the automatic syncing feature, which locks the chime on the 3/4 cycle until the hour (in case the chimes get off). I'm not sure why one lobe is so much wider than the others. Maybe someone here will know. As far as I can tell, it would only create an early warning run.

 

[Mike Phelan]

The wide lobe is probably because this clock stops its chime during the night and restarts it first thing in the morning. If you need to know how this works in detail and nobody else does, I'll explain tomorrow.

 

[mikehutson]

The component with the three lobes that you refer to, is called the chime flirt. Or chime lift. This is lifted by the star cam on the centre arbor.

The highest lift will be on the hour. That is required to overcome the automatic syncing feature, which locks the chime on the 3/4 cycle until the hour (in case the chimes get off). I'm not sure why one lobe is so much wider than the others. Maybe someone here will know. As far as I can tell, it would only create an early warning run.

Thanks for the info. Long lobe provides a long warning. Not sure why, but all works as it should.

 

[Mike Phelan]

Long lobe provides a long warning. Not sure why, but all works as it should.

See my post above regarding the long warning.