---------------------- multipart/alternative attachment Look for abrasive deposits on the spoons digging into the lifter felt. Dan Gurnee On Wednesday, February 1, 2006, at 11:54 AM, Michelle Stranges wrote: > HEY... you stole my thought!! > > :D > > I was thinking it was something to do with the dampers/spoons too! > > :) > M > On Feb 1, 2006, at 1:20 PM, central wrote: > > Aaron, > =A0=A0=A0=A0I had bobbling hammers on a Yamaha P22 which only happened = with=20 > the pedal down. =A0It turned out to be the damper pedal adjusting wing=20= > nut on the trap lever. =A0=A0When the pedal was down, the the dampers=20= > could be moved a slight amount by the key. =A0=A0In very light playing = a=20 > pianist felt resistance when the spoons hit the damper levers and that=20= > would effectively be the bottom of key travel, consequently bobbling=20= > hammers. =A0Regulating it so no movement of dampers could be seen with=20= > pedal held down solved it. > -Mike Jorgensen > > > On 2/1/06 12:55 PM, "Vincent Mrykalo" <v.mrykalo@utah.edu> wrote: > > Aaron, > A thicker but(t) felt will do it for you. > > On Jan 30, 2006, at 5:58 PM, Aaron Bousel wrote: > > Hi all, > =A0I sent this about a week ago and got no response, so I thought I'd=20= > try again. > > =A0Thanks to all who have responded to this. UMass is on winter break=20= > until a week from Monday and after that I'll have a chance to get back=20= > to that piano (private customer). In response to what I've read so > = far: > =A0I will of course recheck the regulation, but I don't think that's = the=20 > issue. The bobbling happens on a very soft blow when, I suspect, the=20= > key doesn't even go all the way down, so more key dip won't help. I'll=20= > check the profile of the butt "leather" to see if a thicker butt felt=20= > will allow better escapement without allowing the jack to skip out too=20= > easily. > > =A0To go bac! k to why eturn springs as a solution: On a very soft,=20 > incomplete, blow the hammer is thrown at the string just as the jack=20= > hits let-off. The hammer then rebounds from the string but since the=20= > key has not been fully depressed when the hammer rebounds from the=20 > string (as someone said, it could be .005" short of complete travel=20 > and that could make the difference) it hits the jack and rebounds off=20= > of it. If there is no resistance in the pinning, and the hammer=20 > springs are weak, it will just bounce off the jack, back onto the=20 > string, back onto the jack, back onto the string, until it runs out of=20= > energy. > > =A0There was one part of my question no one answered. That was about=20= > good quality flange bushing cloth. I haven't had to buy any for quite=20= > a while so I was wondering about a good source. Also, since we had the=20= > discussion about glues; does anyone use anything but hot hide glue for=20= > rebushing flanges? > > =A0And just a bit off topic: My email program (Eudora) monitors = incoming=20 > mail for ! questiona nguage, and alerts me by marking such incoming=20 > mail with one or more chili pepper icons in my inbox. Several of the=20= > posts on this topic arrived with "chilis" and it took me a while to=20 > figure that the program didn't like all this talk of "butts". > > =A0I'm also looking forward to checking out Don's info on the sticker=20= > tongue position. > =A0(Butts and tongues--what is this list coming to?) > > =A0Aaron > > =A0 > > =A0 > > =A0 > > > There is a Mason & Hamlin upright model 50 (vintage 1975) I service=20 > and at the last tuning the owner was complaining about bobbling=20 > hammers. The hammer pinning is very loose. I played around with the=20 > note that was bothering her the most and through a combination of=20 > repinning and strengthening the hammer return spring was able to all=20= > but eliminate the problem. The piano is in good regulation. Here's the=20= > issue: The action is really poorly made. 1975 was not e! xactly th n=20= > repinning the one I did, I could see that the flange bushing cloth was=20= > poor quality. It would be wonderful to replace the whole action, but=20= > that's not going to happen. Does anyone know if it's possible to get=20= > replacement hammer flanges? These flanges are different from the=20 > generic ones sold by piano supply houses. If that's not possible, I=20 > have to go with rebushing what's there. Any recommendations on a good=20= > source of flange bushing cloth? I know M&H are making these again.=20 > Anyone know if the action design is the same? > > =A0thanks, > =A0Aaron > > =A0=A0------------------------------------------ > =A0Aaron Bousel > =A0Registered Piano Technician, Piano Technicians Guild > =A0 abousel@comcast.net > =A0(413) 253-3846 (voice & fax) > > > > =A0 > =A0=A0----------------! --------- on Bousel > =A0Registered Piano Technician, Piano Technicians Guild > =A0 abousel@comcast.net > =A0(413) 253-3846 (voice & fax) =A0 > =A0 > =A0=A0------------------------------------------ > =A0Aaron Bousel > =A0 abousel@comcast.net > =A0(413) 253-3544 (voice) > =A0(413) 253-3846 (voice & fax) > > > > > ---------------------- multipart/alternative attachment A non-text attachment was scrubbed... Name: not available Type: text/enriched Size: 5409 bytes Desc: not available Url : https://www.moypiano.com/ptg/caut.php/attachments/a0/12/06/b9/attachment.bin ---------------------- multipart/alternative attachment--
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