regulation problems in Aeolian era M and H 50"

[Piannaman@aol.com]

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In a message dated 12/18/04 5:48:46 PM Pacific Standard Time, 
kam544@gbronline.com writes:


> 
> >> Salutations,
>> 
>> I've got some regulation problems on a 50 inch Mason upright from the 70s.  
>> I've worked on other Aeolian uprights of that vintage, and some of them 
>> have the same problem.  
>> 
> >> The initial problem was that the keys weren't bottoming out on punchings. 
>>  It seems that it's been that way since new(though they bought it used).  
>> There was a huge gap between the bottom of the key and the punching when the 
>> key was depressed.  This led to hammers blocking, bobbling, and a feel that 
>> could only be described as spongy.  
> 
> 
> Something is preventing the keys from contacting the front rail punchings. 
> Whatever it is, I'd be looking to find out.
> 
> >> At my last visit, I added punchings, and improved the feel somewhat, but 
>> some of the bobbling is still there.  I also had to increase letoff distance 
>> in some areas of the keyboard an unacceptable amount to get it to work 
>> without hammers blocking against strings.
>> 
>> I think that the main problem is that the key height is too great.  It was 
>> somewhere around 70mm, though I forgot to write it down.  More precise 
>> measurements are necessary, and they will be forthcoming after my next visit 
>> there in January.  Blow distance is at 1 7/8(the only thing in the piano that 
>> 
> 
> 
> Taking the measures you is not going to solve the problem.
> 
> 
> >> I tried lowering the key height on a few sample keys by removing balance 
>> rail punchings, but there was nowhere near enough aftertouch.  Should I try 
>> increasing blow distance to 2 inches or more?  Any ideas???  
> 
> 
> Increasing blow distance is only going to exacerbate the situation. 
> Decreasing the distance will enhance aftertouch.
> 
> 
> Find the reason for, "... There was a huge gap between the bottom of the key 
> and the punching when the key was depressed ...", and all will be revealed.
> 
> 
> Keith
> 

Keith,

That's what's been causing me problems.  I've searched and searched, and I 
can't figure it out.  I've decreased blow distance, and there was not enough 
aftertouch and bobbling hammers regardless of how I tried to regulate it.

I'll try to get back over there sometime early in the new year and see what I 
can figure out.  Very frustrating piano.  

Thanks for the input.


Dave S.

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