This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment Stephane: Thanks for catching that, yes I meant increase the blow distance to = reduce aftertouch. =20 Good aftertouch has to do with jack clearance from the knuckle when the = key is fully depressed. More than 1.5 mm is unnecessary. I don't like to alter the angle of the jack relative to the knuckle, but = I see it happening on vintage NY Steinways that go to 17mm knuckles. = Though in that case the knuckle will incline toward the hammer more, = whereas by increasing the spread, the jack will incline toward the = hammer flange more. I suppose in making the choice between spread and = blow it would depend on how much deviation is necessary. I don't like = to lengthen the blow excessively. It adds weight to the action and = creates a feeling of lack of control. Also, if the action ratio is so = high that you are significantly compromising regulation, then it might = be worth assessing the weight and balance as well. Higher action ratio = not only means shorter dip, or longer blow, but, more importantly, = poorer force leverage. In short, anything you do will be a compromise, = so you just have to try some samples and see how it works. If you = can't get it to regulate the way you want, further analysis of the = placement of the capstan/knuckle might be in order. David Love ----- Original Message -----=20 From: St=E9phane Collin=20 To: Pianotech=20 Sent: September 16, 2002 3:06 AM Subject: Re: Bechstein grand spread dimension, David, Just two questions. Action ratio is equal to=20 blow distance - letoff=20 key dip - after touch=20 By increasing the spread you will lower the action ratio. A lower = action ratio will mean that the piano will require deeper dip. Or, in = your case, you will have less aftertouch. Before doing this, you will = have to make sure that altering the spread doesn't create other problems = especially in terms of jack/knuckle alignment. =20 The other alternative is to reduce the blow distance. =20 If I follow you, didn't you mean increase the blow distance (in order = to reduce the aftertouch for the same key dip and same action ratio) ? Can I ask you how you define a good aftertouch ? By feel at the key ? = by precise measuring (at the key or at the jack) ?=20 And indeed, do you feel it is more important to keep good alignment = between jack and knucle core, and therefor altering preferrably the = hammer blow ? Thanks for your expert advises. St=E9phane Collin. ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/e0/28/68/cf/attachment.htm ---------------------- multipart/alternative attachment--
This PTG archive page provided courtesy of Moy Piano Service, LLC