The net effect will be to lower the action ratio somewhat. that kind of change from 15.5 to 16.2 probably lowers the balance weight by 2 to 3 g if you're using the same hammers. If you're changing hammers, then you'll want to consider whether 16.2 is adequate given the weight of the new hammers. So the answer is a little bit more involved than you've given data for.
I have another thread going in which I'm doing some beta testing on spreadsheet calculations for exactly this purpose so if you'd like to participate in that contact me privately I can give you some information on how this will pan out if you're able to take certain measurements.
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David Love RPT
www.davidlovepianos.comdavidlovepianos@comcast.net415 407 8320
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Original Message:
Sent: 08-04-2023 13:26
From: Gary Bruce
Subject: Center Pin to Knuckle Center
1980 S&S M with teflon is getting new HS&F. What will be the ratio effect, positive or negative, if I use 16.2mm pin to knuckle shanks when the originals are 15.5mm? I could figure it out but it's hot today.
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Gary Bruce, RPT
Bruce Piano Service
Edmond, OK
405-413-TUNE
www.brucepiano.com
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