[pianotech] Jack Springs

[David Ilvedson]

Or buy the new model...

David Ilvedson, RPT
Pacifica, CA  94044

----- Original message ----------------------------------------
From: "John Ross" <jrpiano at win.eastlink.ca>
To: pianotech at ptg.org
Received: 3/11/2010 2:34:06 PM
Subject: Re: [pianotech] Jack Springs


>That must be a really long pipe cleaner. LOL
>It seems to me, you would still have the untangling to do, in order to  
>put them on the pipe cleaner.
>A piece of string might work better.
>John Ross,
>Windsor, Nova Scotia.
>On 11-Mar-10, at 6:23 PM, wimblees at aol.com wrote:

>>
>> they don't tangle into one giant permanent spring in the bag.
>> to keep them from being tangled, I think there was a tech tip to put  
>> them all on a pipe cleaner.
>> Wim
>>
>>
>>
>> -----Original Message-----
>> From: Ron Nossaman <rnossaman at cox.net>
>> To: pianotech at ptg.org
>> Sent: Thu, Mar 11, 2010 12:18 pm
>> Subject: Re: [pianotech] Jack Springs
>>
>> John Ross wrote:
>>  It is from Schaff, item number 527A, upright jack spring.
>> > The physical properties are equal taper from top and bottom, to a  
>> > compacting of a couple of coils, in the centre, like each end.
>> > The old springs were a double at each end, and the winding went  
>> wider in > the middle.
>>
>> John,
>> I haven't used any of these yet, but there was a Journal article  
>> (don't know when) on how the design was arrived at. There's less  
>> torsion stress on the wire because there are more coils within the  
>> compression range, pretty much eliminating breakage and producing a  
>> more constant spring rate, and they don't tangle into one giant  
>> permanent spring in the bag. I don't see a reason they'd be noisy,  
>> but I don't really know. I'd try them.
>> Ron N