bass string problem

[John Delacour]

At 2:32 pm +1000 23/9/06, Overs Pianos wrote:

>Before you get a new string made, it would be worth having a look at 
>the original design on a scaling spreadsheet. Post up the speaking 
>length, cover diameter and the note number on the piano. We can look 
>at the tension to see if it is getting up near critical levels. 
>Quite a few of us on the list have spreadsheets in which we can drop 
>the numbers to see what is going on.

A few years ago I produced a web form where you can calculate bass 
strings.  You will find it here:

<http://ccgi.pianomaker.plus.com/cgi-bin/stringcalc.pl>

The script needs some refinement and at the moment I haven't the time 
to perfect it, but it gives pretty accurate results.


The table below gives the tension in pounds for each wire number that 
it is unwise to exceed in the design of wound strings.

12 => 121
12.5 => 129
13 => 137
13.5 => 144
14 => 152
14.5 => 160
15 => 168
15.5 => 175
16 => 184
16.5 => 193
17 => 201
17.5 => 210
18 => 220
18.5 => 228
19 => 237
19.5 => 248
20 => 260
20.5 => 271
21 => 284
21.5 => 295
22 => 307
22.5 => 319
23 => 335
23.5 => 353
24 => 372
24.5 => 399
25 => 426
25.5 => 462
26 => 508