Was there a change in there someplace? The only Model C I have notes on had a strikeline that was at approximately 2 degrees to the front of the keybed (if my notes are correct). The distance from the front of the rim arms to the strikepoint of C-88 is about 50 mm shorter than the distance from the front of the rim arm to the strikepoint at A-1. Granted this is for an 88-note piano, but did they change plates and rims when those three extra notes were added? ddf Delwin D Fandrich Piano Design & Fabrication 620 South Tower Avenue Centralia, Washington 98531 USA del at fandrichpiano.com ddfandrich at gmail.com Phone 360.736.7563 -----Original Message----- From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of John Delacour Sent: Wednesday, February 17, 2010 12:29 PM To: pianotech at ptg.org Subject: Re: [pianotech] strike line At 08:23 -0500 17/2/10, Russell Gordon wrote: >John, could you please go into a little more detail / rationale >about your method? I've always gone off of a set of dimensions for >note #1 that I got many years ago from Steinway, but of course >neither the A or the C is listed. > >>If you measure from the front of the front rail to a point 3.5 mm >>into the speaking length of note A-85 and then measure that >>distance at a right angle from the rail to a point on string A-1, >>that should touch the strike line, I think. >> >>JD The rationale is as follows: 1. The strike line (bird's eye view) is straight (see my posting with subject "Hammer strike line" of Mon, 8 Feb 2010 23:41:56 +0000) and, on most grand pianos, parallel to the line of the key-fronts and hence to the front of the front rail (Am. stretcher?). 2. The speaking length of note 85 is roughly 60 mm and the strike point, say, 1/16 of this, which is 3.75 mm. The precise length of the string or the strike point makes hardly any difference - you'd be doing well to get the measurement to the nearest millimeter. 3. Since the strike line is parallel to the front rail, the distance from the front rail to the strike point will be the same for all notes. I'd be interested to see the dimensions you got from Steinway for other models. Only today I was chatting with a local colleague about this question and how Steinway, unlike Yamaha, do not publish action dimensions etc. Just as well for them, otherwise they might have to stick to them! JD -- ______________________________________________________________________ Delacour Pianos * Silo * Deverel Farm * Milborne St. Andrew Dorset DT11 0HX * England Phone: +44 1202 731 031 Mobile: +44 7801 310 689 ______________________________________________________________________
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