This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment Hi, Michael, Here are some sites that might work as a "Rosetta Stone" for US parts = terms: http://www.musicplay.com/action/action.html http://www.rennerusa.com/Renner_Action/Action_Parts/action_parts.html http://www.pianosupply.com/dl/ UK "set-off" =3D US "letoff" UK "let-off" =3D US "drop" UK "striking distance" =3D US "blow distance" "The UK and the US are divided by a common language." -- Mark Twain. --Cy Shuster-- Rochester, MN ----- Original Message -----=20 From: Michael Gamble=20 To: pianotech@ptg.org=20 Sent: Wednesday, October 08, 2003 3:20 PM Subject: Grand regulation... Hello all. This is an attempt to get some input from those who (that = means all of you I guess) frequently regulate grand actions. From the = start we have a few hurdles to get over and of these the principal one = is that of terminology. In regulation you get a) the parts which are = being regulated and b) the name given to that part of the regulation = process. Are we at one with the name "striking distance"? which should = be about 1 7/8" Then we have "Set-off" In this part we adjust the = "Set-off Button" until it touches the toe of the "Jack" and causes the = hammer to stop rising and go into the "escapement" mode.This Set-off = happens about 1/16" below the string. Next we have the "Let-off" (I = think that's sometime called "Drop") when the hammer after hitting the = string is allowed to subside another 1/16". Not to be confused with = "Check" when the hammer after hitting the string more forcibly rebounds = into the loving grasp of its check-block. If then, whilst the hammer is = captivated in check you gradually release the key the hammer should = float upwards - not too fast. This we call "Hammer rise".. OK? The point of all this is I went to tune a new Petrof grand the other = day and was amazed by how much this Czechoslovakian manufacturer had = deviated from what I considered the "norm". The results were as follows: Striking height 1 7/8" (OK) Check 13/16" ? Set-off 1/8"!!! Let-off 3/8"!!!! And the hammer-rise test showed that all the hammers came up faster = than you can say knife! Here's the question therefore - What are the correct settings? My Steinway service manual adheres pretty firmly to my first list of = requirements except that the "Let-off" is considered with relationship = to the diameter of the string affected. Oh yes - there's another aspect of regulation. It's vital that the = "Key depth" be correct. Steinway recommend 9.75 on models S - B and = 9.75mm on C & D Reblitz, on the other hand, is a bit more "global" in his approach = giving more latitude.=20 At the end of the day does the piano react as a concert pianist would = expect? Over to you. Michael G (UK) ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/5c/7c/d3/b8/attachment.htm ---------------------- multipart/alternative attachment--
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