Way to simple. My first thought was the check catching the hammer. But with this problem the action can function normally on a soft blow and catch on a hard blow. This action was doing the opposite. Back checks worked normally. ddf Delwin D Fandrich Piano Design & Fabrication 6939 Foothill Court SW, Olympia, Washington 98512 USA Phone 360.515.0119 — Cell 360.388.6525 del at fandrichpiano.com — ddfandrich at gmail.com -----Original Message----- From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of John Delacour Sent: Saturday, July 16, 2011 12:11 AM To: pianotech at ptg.org Subject: Re: [pianotech] Weekend puzzler At 23:09 -0700 15/07/2011, Delwin D Fandrich wrote: >...As the key is depressed slowly-pianissimo-for the first millimeter >or so the key and hammer move smoothly. Then something starts binding, >it feels like something in the action is dragging, holding the key and >action back. After forcing the key down another three or four >millimeters action becomes free and everything operates normally. On a >medium to hard blow there is good power and the problem is hardly >noticeable but at pianissimo the action will hardly play. > >What is the problem and what caused it? Sounds like the check catching the hammer on the way up, which would be caused by the lowering of the hammer rest position (too much blow), increase in lost motion in the jack window, slightly high setting of the check position or a combination of all these three things. However, I would expect the problem to be a bit more than "hardly noticeable" under a hard blow. JD
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