Yamaha Stringing scales

[Roger Jolly]

Hi Avery, 
         As an example #15 metric is .001" thinner than the American #15,
this translates to a reduction of approximately 10lbs per string. Typically
this will reduce overall tension by 3/4 of a ton.
Regards Roger 




At 11:15 AM 27/07/98 -0500, you wrote:
>John,
>
>   For a piano of that size & quality, I think I'd go ahead and "bite the
>bullet" and order some metric wire from Mapes or somewhere. :-) You're
>probably going to run into a lot of metric wire pianos out there anyway.
>   I just got 12 coils of Mapes best American wire ($67.80) and 12
>cannisters for a total of $93.60 plus freight. I'm sure the metric would be
>comparable. I bought mine several years ago after I restrung the top two
>sections of our Hamburg 'D' with American wire before it occurred to me
>that it was metric. :-( I always have learned my lessons the hard way.
>   The metric wire is designated with the same numbers as the American.
>That's what your numbers on the bridge are. But the sizes are not exactly
>the same for identical numbers.
>   I'm not a scaling expert, but my guess is that if you're going to change
>to American wire, you probably ought to measure the speaking lengths and
>have someone rescale it. I don't know how much overall difference it will
>make, but there *are* some differences in the sizes.
>   Below is a chart of the dimensions that Ray Chandler once did for Kawai.
>Hope it helps.
>
>Avery
>
>>I am restringing a Yamaha C7 and dont' have the original strings avaible to
>>mic sizes.
>>
>>The bridge is marked or string gauges, but I seem to recall that the Yamaha
>>gauges are metric and slighty different than American (i.e. a #15 isn't
>>always a #15)
>>
>>Is this true? If so could someone be so kind as to give me a conversion or
>>expaination of the marked brige numbers?
>>
>>Thanks in advance (as always)
>>
>>
>>John McKone, RPT
>>St. louis Park, Minnesota
>>(612) 280-8375
>>mckonejw@skypoint.com
>
>
>METRIC      DIAMETER      NEAREST US #       DIAMETER
>13          .0305            13              .0310
>13.5        .0315            13.5            .0320
>14          .0325            13.5            .0320
>14.5        .0335            14              .0330
>15          .0344            14.5            .0340
>15.5        .0354            15              .0350
>16          .0364            15.5            .0360
>16.5        .0374            16              .0370
>17          .0384            16.5            .0380
>17.5        .0394            17              .0390
>18          .0404            17.5            .0400
>18.5        .0413            18              .0410
>19          .0423            18.5            .0420
>19.5        .0433            19              .0430
>20          .0443            19.5            .0440
>21          .0463            20.5            .0460
>22          .0482            21.5            .0480
>23          .0512            23              .0510
>24          .0551            24              .0550
>25          .0591            25              .0590
>
>___________________________
>Avery Todd, RPT
>Moores School of Music
>University of Houston
>Houston, TX 77204-4893
>713-743-3226
>atodd@uh.edu
>http://www.music.uh.edu/
>
>
>
Roger Jolly
Baldwin Yamaha Piano Centre
Saskatoon and Regina
Saskatchewan, Canada.
306-665-0213
Fax 652-0505