Attached find a Word File chart that compares Standard piano wire gage values to Metric. I used standard metric-to-inches conversions. I put this together rather quickly, so please study and let us all know if there is a problem with it, if I misssed something. I think it looks correct, though. A bit of perspective (for example note# 21): 1800mm long, standard gage 21 (0.047"): Ten = 195; BRK% = 35; INH = .059 Same note using metric gage 21 (0.0463"): Ten = 189; BRK% = 35; INH = .057 Not a big difference, and over the span of an entire scale a change from standard to metric might reduce the overall tension by, say, 1100 to 1500 pounds of pull (a quick calculated guesstimate). Still, should be kept in mind. Changes in whole sizes with either gage protocol, however, are more significant; 1800mm long, standard gage 20 (0.045"): Ten down to 179 (From 195); BRK% = 35; INH = 0.054 1800mm long, metric gage 20 (0.0443"): Ten down to 173 (from 189); BRK% = 35; INH = 0.053 Regards, Nick Gravagne, RPT Piano Technicians Guild Member Society Manufacturing Engineers Voice Mail 928-476-4143 > Don't forget these are metric wire sizes. The size listed will be a > 1/2 size larger or smaller than standard sizes. I forget right off the > cuff. I think adding a 1/2 size to the stated number makes them the > correct diameter. -------------- next part -------------- A non-text attachment was scrubbed... Name: Piano Wire Chart.doc Type: application/msword Size: 92672 bytes Desc: not available URL: <http://ptg.org/pipermail/pianotech_ptg.org/attachments/20090307/a353c99d/attachment.doc>
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