Tim asks: << Could someone shed some light on gauging the proper amount of drop for grand regulation. I'm working on a Yamaha with poor after touch. Any help would be appreciated.>> Greetings, I set drop at the same distance from the string as I do let-off. They are both dependant on the string excursion zone to set the limit on powered hammer travel. The springs need be set to lift the hammers from check as fast as possible without being felt in the key. The aftertouch is dependant on three things: hammer blow, let-off, and keydip. It is inversely proportional to the first and proportional to the second and third. Finding the optimum setting for the three requires that you start from somewhere, and usually for the Yamaha, 1 3/4" blow is a good place. Set 1/16" let-off and 3/8" keydip and see what you have for aftertouch. If you need more, lower the keydip first to .395 or so. After that, you may need to raise your hammerline, but .020" of aftertouch is enough for most of these pianos. Regards, Ed Foote RPT
This PTG archive page provided courtesy of Moy Piano Service, LLC