Here's one more piece of info: The new wippen (the one that you can add a heel) is 9.95 cm from center pin to center pin and the old wippen was 9.8 cm. This makes a difference I'm sure. Is it further indication of need to change the spread? --- Bob Hull <hullfam5@yahoo.com> wrote: > David, > > Your comments are appreciated. Here's my answer to > your questions. > > --- David Love <davidlovepianos@comcast.net> wrote: > > What kind of piano is this? > > It is a 5'6" Weber which was rebuilt by someone > else > only 6 years ago but the pinblock was very poorly > fit, > the wippens were not replaced and cheap parts were > poorly used. Now the wippens have failed (silk cord > type)so we decided to start over and hopefully do > things better. > > > If you have to lower the drop screw it may > indicate > > that the bore > > distance on the hammers is too long. Lowering the > > let-off button is > > usually accompanied by the lowering of the drop > > screw and vice versa. > > Andre said something about capstans having to be > lowered and this is true, I am having to lower the > capstans on the samples to set the hammer blow dist. > > > The shank relationship to the knuckle can be > altered > > by changing the > > spread, shimming out the whippen flanges or the > > flange rail. You will > > have to determine the appropriate spread by trial > > and error probably. > > > > The harder feel at let-off of the new wippen may > be > > because the surface > > area of the top of the jack is greater on the new > > one than the old one. > > What condition are the knuckles in? You may want > to > > consider changing > > the knuckles if you are not changing the shanks. > > I am replacing the shanks but now I thinking about > trying a different shank with a bigger knuckle if I > can find the same dimension from the center pin. I > hate not having the original parts to reference. > > > I would measure and calculate just how much you > need > > to lower the plate > > to get the bearing you want and on which side you > > have the problem. > > Also, measure the crown. If you are lowering the > > plate onto a board > > which is already flat or worse... Lowering the > > plate at the outside > > perimeter is not likely to change the hammer bore > > dimension. Lowering > > the plate at the block might, it depends on how > much > > you are lowering > > it. Are you installing a new pinblock? > > I have already put in a new pinblock. The board was > repaired and coated with System 3 epoxy. > I lowered the plate as much as I dared, just enough > to > get some downbearing but not push the board to hard > because of its age. I did have to lower it also at > the block because the thread would contact the back > of > the bridge before the front as it came from the > agraffe. > > > David Love > > davidlovepianos@comcast.net > > > > -----Original Message----- > > From: pianotech-bounces@ptg.org > > [mailto:pianotech-bounces@ptg.org] On > > Behalf Of Bob Hull > > Sent: Saturday, March 19, 2005 7:23 AM > > To: pianotech@ptg.org > > Subject: low drop screw symptom > > > > Hello List, > > > > On a rebuild for a small but good quality grand I > am > > replacing all of the action parts and having some > > doubts about the action configuration. As I > > regulate samples the drop screw has to be lowered > > almost as far as it will go. > > > > Another relationship that appears to be off is the > > jack to hammershank relationship which is not > > perpendicular but rather it is more toward the B- > > side > > (Bob Hoff terminology). How can I change this? > > > > The new (Renner) wippen with the closest match to > > the > > old wippen is the one with the added heel. The > old > > jack tender/toe seemed to interface better with > the > > tilted let off rail than the new wippen does. The > > new > > one gives a harder feeling ledge before let off. > > I don't like the way that feels. > > > > I realize that more information may be necessary > > and > > I can supply it if asked. One other thing I will > > add > > is that I had to lower the plate/string plane as > > much > > as I dared to get some downbearing. I am > adjusting > > the hammer bore because of this. > > > > So to restate my question: What is indicated > about > > an > > action geometry when drop screws must be lowered > so > > far in order to attain suitable drop? > > I would appreciate your comments. > > > > Bob Hull > > > > > > > > > > __________________________________________________ > > Do You Yahoo!? > > Tired of spam? Yahoo! Mail has the best spam > > protection around > > http://mail.yahoo.com > > _______________________________________________ > > pianotech list info: > > https://www.moypiano.com/resources/#archives > > > > > > _______________________________________________ > > pianotech list info: > > https://www.moypiano.com/resources/#archives > > > > > > __________________________________ > Do you Yahoo!? > Yahoo! Small Business - Try our new resources site! > http://smallbusiness.yahoo.com/resources/ > _______________________________________________ > pianotech list info: > https://www.moypiano.com/resources/#archives > __________________________________ Do you Yahoo!? Yahoo! Small Business - Try our new resources site! http://smallbusiness.yahoo.com/resources/
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