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400-day clock: Spring replacement

boblalux

Registered User
Nov 13, 2013
55
1
8
Friesland, Germany
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I am replacing the spring on my 400-day clock. Can someone remind me..... the THINNER the spring the FASTER the clock, or is it the other way round?

Thanks
 

Harry Hopkins

NAWCC Member
Nov 16, 2011
558
49
28
Mason, IL
www.harrysclockshop.com
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I am replacing the spring on my 400-day clock. Can someone remind me..... the THINNER the spring the FASTER the clock, or is it the other way round?

Thanks
A thinner spring will cause the clock to run slower. I believe the rule of thumb is that each .0001" of thickness is equal to about 4 minutes/hour.
 

shutterbug

Moderator
Staff member
NAWCC Member
Oct 19, 2005
49,469
2,925
113
North Carolina
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I'll move this to the 400 day forum. Each clock has a recommended suspension spring associated with it. If you can supply a pic of the back plate of your clock, we can provide you with that information.
 

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