Slowing down a Herr miniature

Tinker Dwight

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Oct 11, 2010
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Re: Slowing down a Herr miniture

Where did you buy the spring and what thickness do
you measure on it ( you'll need an accurate micrometer )?
Also, not every spring in the book is correct.
It may also be that the pendulum has been swapped.
Tinker Dwight
 

MartinM

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Jun 24, 2011
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Re: Slowing down a Herr miniture

And... If it's the one I think it is, there were two different types with two different springs.
 

Henry Anthony

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Jan 24, 2013
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Re: Slowing down a Herr miniture

Tinker, I got the spring at Merritts and I miced it at .0025". I got the pendulum in a bag along with the clock but it has 4, 6 sided spheres that agree with the pictures in the books. Martin, your correct, there are two springs a 28a and 28b. the only difference is the blocks on either end.
 

Henry Anthony

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Jan 24, 2013
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Re: Slowing down a Herr miniture

Hi Tinker,
Now I know why I resisted repairing these clocks over the years. What size spring would you suggest I use? A heavy one or a thinner one. I am at a loss.
Henry
 

Burkhard Rasch

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Jun 1, 2007
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Re: Slowing down a Herr miniture

thinner springs slow down these clocks,thicker speed them up.Best would be to post some pics of the clock,both back plate and front,and we could give You the exact size You need.There is no need to resist from these clocks,they are simple time pieces and fun to work on if You understand what to do.No witchwork!
Best regards
Burkhard
 

Tinker Dwight

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Oct 11, 2010
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Re: Slowing down a Herr miniture

Many of the springs, not directly from Horolovar have
been known to be the wrong width, even though the right
thickness.
Put your adjuster at the middle of the range and give us
an exact amount of time it is off in one hour.
Also, please give us the width of the spring you have
as well.
We can then make a better guess at the desired spring.
Tinker Dwight
 

shutterbug

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Oct 19, 2005
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Re: Slowing down a Herr miniture

The Horolovar springs are always exactly .018" wide. The ones supplied with the complete units like what you bought are wider. That's what causes the problems in timekeeping. I suspect that you mis-measured yours, since it's narrower than normal. If you use search, you can learn how to thin the spring you have. When you get it thin enough, it will keep time for you. Be sure to set the pendulum adjuster in the center position before you start thinning, so you have adjustment abilities on both sides of 'perfect'. The total adjustment on the pendulum should be around 4 minutes per hour, so if you get it within two minutes per hour you should be able to adjust for the error.
 

Tinker Dwight

Registered User
Oct 11, 2010
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You could also buy thinner springs.
After reading SBugs, I'm not sure if you have a
good starting reference.
Normally the thickness of 0.0001 per 4 minutes of
correction is desired.
If the spring is standard width, a 0.051 or 0.053 spring
is needed.
If you don't want to try to thin the one you have,
buying the bare springs and moving the pieces works.
Tinker Dwight
 

KurtinSA

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Nov 24, 2014
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I'd suggest some units of measurement be provided...I'm a little confused! Henry mentioned his spring was 0.0025 thick and Tinker suggests a spring of 0.051 thick. That's quite a difference. I suspect Henry was using inches (0.0025 inches is 0.0635mm) and Tinker's was metric (0.051mm is 0.002 inches).

Kurt
 

Tinker Dwight

Registered User
Oct 11, 2010
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Calif. USA
I'd suggest some units of measurement be provided...I'm a little confused! Henry mentioned his spring was 0.0025 thick and Tinker suggests a spring of 0.051 thick. That's quite a difference. I suspect Henry was using inches (0.0025 inches is 0.0635mm) and Tinker's was metric (0.051mm is 0.002 inches).

Kurt
Sorry, I should have followed with mm.
Horolovar list springs by metric size. Henry posted
inches measurements.
Tinker Dwight
 

shutterbug

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:thumb:
 

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