[CAUT] M & H model 50

[central]

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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)
> 
> 



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