---------------------- multipart/alternative attachment 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, > I had bobbling hammers on a Yamaha P22 which only happened with > the pedal down. It turned out to be the damper pedal adjusting > wing nut on the trap lever. When the pedal was down, the the > dampers could be moved a slight amount by the key. In very light > playing a pianist felt resistance when the spoons hit the damper > levers and that would effectively be the bottom of key travel, > consequently bobbling hammers. Regulating it so no movement of > dampers could be seen with 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, >>> I sent this about a week ago and got no response, so I thought >>> I'd try again. >>> >>> Thanks to all who have responded to this. UMass is on winter >>> break until a week from Monday and after that I'll have a chance >>> to get back to that piano (private customer). In response to what >>> I've read so far: >>> I will of course recheck the regulation, but I don't think >>> that's the issue. The bobbling happens on a very soft blow when, >>> I suspect, the key doesn't even go all the way down, so more key >>> dip won't help. I'll check the profile of the butt "leather" to >>> see if a thicker butt felt will allow better escapement without >>> allowing the jack to skip out too easily. >>> >>> To go bac! k to why eturn springs as a solution: On a very soft, >>> incomplete, blow the hammer is thrown at the string just as the >>> jack hits let-off. The hammer then rebounds from the string but >>> since the key has not been fully depressed when the hammer >>> rebounds from the string (as someone said, it could be .005" >>> short of complete travel and that could make the difference) it >>> hits the jack and rebounds off of it. If there is no resistance >>> in the pinning, and the hammer springs are weak, it will just >>> bounce off the jack, back onto the string, back onto the jack, >>> back onto the string, until it runs out of energy. >>> >>> There was one part of my question no one answered. That was >>> about good quality flange bushing cloth. I haven't had to buy any >>> for quite a while so I was wondering about a good source. Also, >>> since we had the discussion about glues; does anyone use anything >>> but hot hide glue for rebushing flanges? >>> >>> And just a bit off topic: My email program (Eudora) monitors >>> incoming mail for ! questiona nguage, and alerts me by marking >>> such incoming mail with one or more chili pepper icons in my >>> inbox. Several of the posts on this topic arrived with "chilis" >>> and it took me a while to figure that the program didn't like all >>> this talk of "butts". >>> >>> I'm also looking forward to checking out Don's info on the >>> sticker tongue position. >>> (Butts and tongues--what is this list coming to?) >>> >>> Aaron >>> >>> >>> >>> >>> >>> >>>> >>>>> There is a Mason & Hamlin upright model 50 (vintage 1975) I >>>>> service and at the last tuning the owner was complaining about >>>>> bobbling hammers. The hammer pinning is very loose. I played >>>>> around with the note that was bothering her the most and >>>>> through a combination of repinning and strengthening the hammer >>>>> return spring was able to all but eliminate the problem. The >>>>> piano is in good regulation. Here's the issue: The action is >>>>> really poorly made. 1975 was not e! xactly th n repinning the >>>>> one I did, I could see that the flange bushing cloth was poor >>>>> quality. It would be wonderful to replace the whole action, but >>>>> that's not going to happen. Does anyone know if it's possible >>>>> to get replacement hammer flanges? These flanges are different >>>>> from the generic ones sold by piano supply houses. If that's >>>>> not possible, I have to go with rebushing what's there. Any >>>>> recommendations on a good source of flange bushing cloth? I >>>>> know M&H are making these again. Anyone know if the action >>>>> design is the same? >>>>> >>>>> thanks, >>>>> Aaron >>>>> >>>>> ------------------------------------------ >>>>> Aaron Bousel >>>>> Registered Piano Technician, Piano Technicians Guild >>>>> abousel@comcast.net >>>>> (413) 253-3846 (voice & fax) >>>> >>>> >>>> >>>> ----------------! --------- on Bousel >>>> Registered Piano Technician, Piano Technicians Guild >>>> abousel@comcast.net >>>> (413) 253-3846 (voice & fax) >>>> >>>> ------------------------------------------ >>>> Aaron Bousel >>>> abousel@comcast.net >>>> (413) 253-3544 (voice) >>>> (413) 253-3846 (voice & fax) >> >> > ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/caut.php/attachments/7d/19/81/85/attachment.htm ---------------------- multipart/alternative attachment--
This PTG archive page provided courtesy of Moy Piano Service, LLC