1000 day clock

[Anthony Lorenzo]

Does the schatz 1000 day and 400 day clock use the Same pendulum?

 

[KurtinSA]

Welcome to the forum! Sorry, not even close. 400-day Schatz 49 clocks have a pendulum around 12.5 oz. A 1000-day clock pendulum weighs about 5 oz. Any pictures? I presume you're looking for a 1000-day pendulum...here's what one looks like.

Kurt

 

[etmb61]

Some of the 400s used the same pendulum as the 1000s.


And the factory replacement suspension is the same part for 400s and 1000s. Go figure.

Eric

 

[KurtinSA]

Eric -

I haven't gotten around to weighing many of my Coach/Carriage clocks but for the ones that I have, they 400-day clock pendulums are slightly heavier. Also a different configuration. Maybe there are more than one style of these pendulums.

Kurt

 

[etmb61]

I was actually able to get to my ball pendulum coach and the 1000 day to weigh them. The 400 day pendulum, number 58 in the RG, is about 1/2 inch shorter than the 1000 day and weighs 143.75 grams. The 1000 day ball pendulum, not shown in the RG, weighs 144.69 grams .


For comparison, the flying saucer shaped coach pendulum, number 68, weighs 171.14 grams, and the three ball, number 55, weighs 134.96 grams.


The RG calls for a .0024" spring for the 1000 day, and a .0023" for the 400 days. I've found the 3 ball takes a .0022" spring, but I've never replaced any of the others.

Eric

 

[KurtinSA]

The RG calls for a .0024" spring for the 1000 day, and a .0023" for the 400 days.

Interesting. I guess there's a lot to understand about suspension springs. If I read correctly, two different springs are needed for essentially the same weight pendulum. Maybe it has to do with the location of the weight for each pendulum. Different rotational inertia...same weight but different distance from the center of rotation.

Kurt

 

[etmb61]

Interesting. I guess there's a lot to understand about suspension springs. If I read correctly, two different springs are needed for essentially the same weight pendulum. Maybe it has to do with the location of the weight for each pendulum. Different rotational inertia...same weight but different distance from the center of rotation.

Kurt

BINGO!

The flying saucer pendulum is really a 5 ball with the fifth on the center axis, hence the extra weight. But in that position it doesn't greatly contribute to the rotating inertia of the pendulum.

The 3-ball also has to have a higher center mass to be about the same weight was the 4-ball types, but since it has less mass at the outer edge it has a lower moment of inertia and would need a thinner spring.