This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment Can anyone explain me the theory about relationship upweight and = downweight? How do you messure in practise the upweight on a key? Does anybody have experience with those little loads you can screw with = two screws under the key for reducing the downweight, instead of = drilling a hole and hitting the loads in with a hammer. I ask this questions because I need to make less downweight on an old = german grand Altman =B0 1900, (the action is not with rollers on the = shanks, is like an uprightaction.) The technician who advices me is worried that the wood of the keys is = old and meaby will splitt or brake when you drill and hit the loads in. Thank you for advice. danny.boddin@planetinternet.be Danny Boddin Pianoservice Loddershoekstraat 4 B1741 Belgium mobilphone 00 32 (0)75 43 38 43 Fax 00 32 (0)2 582 32 07 -----Oorspronkelijk bericht----- Van: Vince Mrykalo <Vince@byu.edu> Aan: pianotech@ptg.org <pianotech@ptg.org> Datum: donderdag 4 maart 1999 18:37 Onderwerp: Re: Touch weight =20 =20 Do you have wippen helper springs in that action? To remove weight = from the hammers, use the end of a belt sander and remove material from = the sides about an inch and a half down from the crown. That will give = you a sort of hour-glass figure to the hammers if you were to look at = them from the front or back. =20 Don't go by the up and down weights alone after you do this.=20 Make sure that the balance weight (upweight plus downweight divided = by two) stays consistently between 35 and 37. =20 At 11:36 PM 3/3/99 -0500, you wrote:=20 =20 =20 Another way you may want to try is to lighten the hammers. Are = you a good hammer filer? I've done this on several occasions and it = works! There's a lot of felt on most of the hammers you can buy today. = I think most of the sets I've ordered, regardless where they were from, = were larger than they needed to be. One thing you'll have in your favor = is the way the action geometry will affect how much felt you'll need to = remove. If the hammer travels 1 7/8 in, while the key travels 3/8 in., = that's a ratio of 5 to 1. If you remove aprox. 2 oz. of weight from the = hammer, you'll remove aprox. 10 oz. of touchweight. Depending upon how = well the action is weighted now, and upon how even you file those = hammers, you may need to do some work with the key weights to even out = the touchweight.=20 =20 =20 =20 Rogerio Cunha wrote:=20 =20 To the listI am just working on a grand ( B=F6sendorfer ) = and on it I applied new hammers ( original ) , new center pins, and = others items as knuckles, etc, etc,All the material applied is original = and all the work was made with care and the final product was very, very = good except the touch weight.I did all that I learned and read but = wasn't possible to obtain 52 g on the 1st section, 50 g on the 2nd = section and 48 g on the 3rd and 4th section and this is the problem that = I want to know. ( these are manufacturer measurements)The difference is = about +10 g on each section.What to do?I think that the only way would = be to put leads on the keys. Is this correct?To use the piano with + 10g = of touch weight is good?If isn't possible to obtain the manufacturer = measurements what are the good touch weight?I thanks to allROGERIO CUNHA = - IC MEMBER OF THE GUILD=20 =20 =20 =20 Vince <mailto:vince@byu.edu> Visit the web page for the Pacific Northwest Conference at:=20 <www.pnwpianoconf.com>=20 ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/38/23/b5/53/attachment.htm ---------------------- multipart/alternative attachment--
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