Then we're defining ratio differently (not to speak for Fenton). Changing the front weight has nothing to do with the action ratio. I believe what Fenton referred to was replacing lead with help from the assist spring. Then you do have the same hammers, ratio, BW, different leading, because the assist spring takes the place of some of the lead. The action would therefore have lower inertia. David Love davidlovepianos at comcast.net www.davidlovepianos.com -----Original Message----- From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of Richard Brekne Sent: Monday, October 06, 2008 1:56 PM To: pianotech at ptg.org Subject: What's all this I hear about Inertia ? Grin... if you change the amount of FW, then you change the Ratio and you no longer have "an action with the same hammers, ratio, and BW, but different leading" You have an action with both different leading and different ratio. Moreover, the bulk of commentary along these lines so far would seem to support the claim that assist spring compensating for same BW after a change in FW will not be able to create the <<same feel>> (however one arrives at what that might eventually be) Cheers RicB Uh...by using assist springs. Seems fairly clear. David Love davidlovepianos at comcast.net www.davidlovepianos.com Greetings. On assist springs, I think they can make a bad action better by allowing the removal of excess key lead, not the right way to fix things. But, fooling around with these things I was able to 'feel' the same action with different amounts of key lead, . An old 550 Kawai had a nice action until I unhooked the assist springs and added lead. Fenton Curious as to how you got "an action with the same hammers, ratio, and BW, but different leading". If you change the leading, then you change the BW. That is to say unless you changed the leading but kept the FW constant.
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