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Captain of the Tool Police Squares R I gpianoworks.com
-----Original Message-----
From: Regi Hedahl
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-----Original Message-----
From: Regi Hedahl
Sent: May 20, 2021 11:34 AM
To: pianotech
Subject: Re: [pianotech] Kawai KG6C Bass String Breakage Problem
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Hi Regi,
I ran the numbers on notes 1, 11, 22 in Pscale and came up with break percntages of 35%, 74%, 83% respectively. I think the cores in the higher part of the bass are too light for this scale. FWIW I have been designing bass scales and making strings for 25 years. Years ago I did some math with a mechanical engineer using the specs from the Roslau factory for break %. We found Pscale to be so close as to not be worth quibbling about. However – and I know that the Paulello typogram uses break % differently – I couldn’t get the typogram to make sense for me with regards to break %. I don’t wind strings above about 65% (Pscale).
Hope this helps!
Regards,
Stephen (RPT/ARPT)
Sent from Mail for Windows 10
From: Regi Hedahl
Sent: Thursday, 20 May 2021 3:14 PM
To: pianotech
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-----Original Message-----
From: Regi Hedahl
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-----Original Message-----
From: Stephen Powell
Sent: May 20, 2021 5:51 PM
To: "pian...@googlegroups.com"
Subject: RE: [pianotech] Kawai KG6C Bass String Breakage Problem
Hi Regi,
I ran the numbers on notes 1, 11, 22 in Pscale and came up with break percntages of 35%, 74%, 83% respectively. I think the cores in the higher part of the bass are too light for this scale. FWIW I have been designing bass scales and making strings for 25 years. Years ago I did some math with a mechanical engineer using the specs from the Roslau factory for break %. We found Pscale to be so close as to not be worth quibbling about. However – and I know that the Paulello typogram uses break % differently – I couldn’t get the typogram to make sense for me with regards to break %. I don’t wind strings above about 65% (Pscale).
Hope this helps!
Regards,
Stephen (RPT/ARPT)
Sent from Mail for Windows 10
From: Regi Hedahl
Sent: Thursday, 20 May 2021 3:14 PM
To: pianotech
Subject: [pianotech] Kawai KG6C Bass String Breakage Problem
Total Insanity! No wonder this Kawai KG6C was breaking bass strings left and right! I measured them up and inserted the data into Typogramen and some of the strings have a Stress % of over 100%. I have come up with a rescale that is far more reasonable and will probably sound more pleasant. Most bass string winders won't go over anything over 75%. Next time a bass string breaks on you (for seemingly no reason), measure it up before assuming anything.
Regi
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Joe,
As I said, I’ve crunched the numbers based on the Roslau specs (which is very close to Paulello type “M”) and I therefore have every reason to trust the numbers that I’m getting from Pscale. As it happens, Tremaine Parsons has devoted a lot of time upgrading Pscale over the last several years. Where can I try this “Scale Master” of which I can find no reference to with internet searches???
Stephen
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I'm curious, ...how much per set?
Best,
Joe