General string winding guidelines hold that it is preferable if Wrap:Core ratios do not exceed 3:1 for single wound strings and 5:1 for double wound strings. In other words, a core of .045 should not have an outside copper wrap diameter greater than .135 on a single wound string (.045 * 3 = .135). The Pscale automatic scaling routine will break the rule by one core diameter size if necessary while lowering inharmonicity.
The key word here is preferable: The last time I checked notes 1 - 10 on a Steinway Model S baby grand they were single wound strings with wrap:core ratios between 3.5:1 and 4.1:1. Simply put, Piano Makers break the wrap:core ratio guidelines and so do I.
-Regi
The last time I checked notes 1 - 10 on a
Steinway Model S baby grand they were single wound strings with wrap:core
ratios between 3.5:1 and 4.1:1.
On May 23, 2021, at 9:40 PM, pian...@googlegroups.com wrote:
- Wrap:Core String Winding Guidelines - 1 Update
Regi Hedahl <piano...@gmail.com>: May 23 10:27AM -0700
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Hi Regi,
I don’t tend to go higher than about 3.3:1 for single wound and 5.5:1 for double wound. When you get up into the higher ratios, winding a thick wrap around a thin core is a bit like trying to drive a bus round a roundabout! I’ve heard plenty of heavy single wound strings (Steinway) rattle; it’s ridiculous scaling – they should be double-wound. In my experience the double-wound strings sound better. And you can detect the increase flexibility as soon as it comes off of the machine!
Regards,
Stephen
Sent from Mail for Windows 10
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-----Original Message-----
From: Piano Forte Supply
Sent: May 23, 2021 10:38 PM
To: pian...@googlegroups.com
Subject: [pianotech] Wrap:Core String Winding Guidelines
Quote:"
The last time I checked notes 1 - 10 on a
Steinway Model S baby grand they were single wound strings with wrap:core
ratios between 3.5:1 and 4.1:1.
I couldn’t remember seeing a short piano like a S&S model S with single would bass strings in notes in the low bass.
I don’t have an S handy, but the Steinway Service Manual tells me that note 1 - 7 in an S are double wound.
Jurgen Goering
On May 23, 2021, at 9:40 PM, pian...@googlegroups.com wrote:
- Wrap:Core String Winding Guidelines - 1 Update
Regi Hedahl <piano...@gmail.com>: May 23 10:27AM -0700
How far have you been able to push the Wrap:Core ratio when having new bass
strings made? I have gone as far as 5.6:1 for double windings but was
wondering if it can be pushed any larger?
One time I tried to have bass strings made with a Wrap:Core ratio of 7:1
and the string winder refused to make them. LOL!!
Here's what I found from the PScale manual:
General string winding guidelines hold that it is preferable if Wrap:Core
ratios do not exceed 3:1 for single wound strings and 5:1 for double wound
strings. In other words, a core of .045 should not have an outside copper
wrap diameter greater than .135 on a single wound string (.045 * 3 = .135).
The Pscale automatic scaling routine will break the rule by one core
diameter size if necessary while lowering inharmonicity.
The key word here is preferable: The last time I checked notes 1 - 10 on a
Steinway Model S baby grand they were single wound strings with wrap:core
ratios between 3.5:1 and 4.1:1. Simply put, Piano Makers break the
wrap:core ratio guidelines and so do I.
-Regi
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