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 Post subject: Puzzling broken spring
PostPosted: Tue Sep 15, 2020 7:26 am 
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Victor V
Joined: Mon May 13, 2013 2:04 pm
Posts: 2326
I've just replaced a spring and the old broken one was in 10 pieces ! What could cause such failure ? Anyone seen this and know why it happens and how to avoid ?


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 Post subject: Re: Puzzling broken spring
PostPosted: Tue Sep 15, 2020 10:09 am 
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Victor II
Joined: Fri May 22, 2015 9:45 am
Posts: 253
Must have been made from the same steel as the Titanic!


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 Post subject: Re: Puzzling broken spring
PostPosted: Tue Sep 15, 2020 10:24 am 
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Victor IV
Joined: Sat Jul 09, 2016 7:12 pm
Posts: 1709
The only thing I can think of is that the gramophone might have been stored at some time in an unheated shed or attic and the motor was subjected to temperature extremes--freezing cold and heat.

OrthoFan


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 Post subject: Re: Puzzling broken spring
PostPosted: Tue Sep 15, 2020 12:08 pm 
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Victor IV
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Joined: Wed Feb 22, 2012 10:03 am
Posts: 1050
Location: Dover, UK
It's not the first time I've seen a spring in multiple pieces. It does seem strange, but maybe through hot/cold cycles (as others have said) and age, the metallurgy was such that the shock of the spring breaking caused it to shatter in other places as well. Just a vague theory!
BCN thorn needles made to the original 1920s specifications: http://www.burmesecolourneedles.com

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 Post subject: Re: Puzzling broken spring
PostPosted: Tue Sep 15, 2020 2:50 pm 
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Victor IV
Joined: Sun Mar 15, 2009 6:18 am
Posts: 1158
Location: Luxembourg
This kind of sulti-section cracking may also be caused by old grease stress. Winding-unwinding multiple times with old grease makes the spring catch against the neighboring winding at the same sections of the spring and that leads to fatigue.


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 Post subject: Re: Puzzling broken spring
PostPosted: Tue Sep 15, 2020 3:11 pm 
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Victor O
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Say it With Music
Joined: Tue Jan 17, 2017 8:12 pm
Posts: 72
Location: Portland, Oregon
We had a spring with similar damage, but much smaller pieces and close to the arbor. Our spring came from a Meisselbach motor out of a Modernola. The machine came from Phoenix area in Arizona, but there was also some water damage to the lower portion of the cabinet and legs.
This could certainly indicated damage from possible extreme temperature changes. The dried grease theory is very likely a contributor as well. Over-winding maybe?

The only other thought we had was it may be an Italian spring- "Fra-GI-le" :lol
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 Post subject: Re: Puzzling broken spring
PostPosted: Tue Sep 15, 2020 7:47 pm 
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Victor Monarch
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Needle Tins are Addictive
Joined: Fri Jul 09, 2010 8:32 pm
Posts: 4891
Location: Belmont, North Carolina
It may be the result of poor steel or improper tempering. During WWI and WWII steel was in short supply, so it may be an inferior product...
"The phonograph† is not of any commercial value."
Thomas Alva Edison - Comment to his assistant, Samuel Insull.

"No one needs a Victrola XX, a Perfected Graphophone Type G, or whatever you call those noisy things."
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 Post subject: Re: Puzzling broken spring
PostPosted: Wed Sep 16, 2020 8:03 pm 
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Victor VI
Joined: Mon Aug 24, 2009 3:08 pm
Posts: 3153
Location: Harrison Township, MI
The spring breaks while fully wound and flies out against the walls of the barrel with such force that the spring shatters.


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