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400 day clock

Robert Gary

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Feb 26, 2003
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jeblair:

I am sure someone will be along soon to address your problem, but I would also suggest you post this same question on the "400-Day & Torsion Clocks" page about 3/4 of the way down on the message board directory page. That's where the real experts on these clocks hang out.

Good luck with your clock.

RobertG
 

erngrover

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Aug 6, 2003
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Firstly, read these instructions carefully. 400 day Setup

It is not uncommon for *ready-made* suspension units to keep poor time. The units may measure the same physically, however, the Horolovar alloy is quite specific. Likely you'll have to invest in some genuine Horolovar replacement wires to finish up this job.

Thinning out the suspension spring will cause the clock to run slower. See a previous discussion old ref::Suspension Spring Thinning and old ref::Getting a 400 day disc pendulum clock to keep good time and old ref::Help!

If you botch it up, mark it up as experience. You can always fall back on the correct wire from Horolovar. These genuine Horolovar wires are commonly available through most clock parts suppliers.
 

doug sinclair

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Aug 27, 2000
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jeblair,

Your problem is a common problem when these suspension springs are ordered as a unit. They cannot be trusted to be the correct strength. The only way to go is to order the correct Horolovar spring for the clock and to transfer the suspension components over to the correct spring. Let us know how you make out, please. And Robert is correct. This should really be posted on the 400-day clock message board.
 
D

David Holk

Jeblair,

I got into a Schatz 49 where rather than get the correct suspension spring, someone had removed two of the weights in the pendulum.
Could this be the problem?
Also, is there adequate tension where the minute hand is attached to its arbor?

David
 

John Hubby

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Sep 7, 2000
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Hi Jeblair

You certainly should check to see if the pendulum has missing weights, but I think the real problem is the suspension unit you got from TimeSavers, although there is an outside chance that your clock is one that has an incorrect reference in the Repair Guide.

If you could give us the backplate number from the Repair Guide that will help.

Assuming the pendulum is OK and you have the right unit number you will need to check what strength of suspension spring is recommended by Horolovar and buy that. They sell them in packs of three, call 313-882-9380 and ask for Bill or Sue Ellison.

Here's the deal: The suspension springs from TimeSavers, although perhaps the right thickness, many times are too wide and that causes them to run quite fast. The torsional modulus is proportional to the CUBE of the cross-sectional area, and just a "little bit" means a lot.

That can be corrected as has been suggested by thinning, although the best option is to install the correct Horolovar spring.

A rule of thumb to remember: Your clock is running one hour in 24 too fast. That's 2.5 minutes per hour. One size smaller suspension spring (thinner) will slow down the clock by 4 minutes per hour, no other changes being made. However, since you've added weight to the pendulum, you need first to check how fast it runs in minutes per hour with the pendulum set at its mid-point and no additional weights. If it is more than 4 minutes per hour fast, you will need to go down TWO sizes to bring the clock into range.

Hope this will help, keep us posted how it works out.

John Hubby
 

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