S&S replacing Hammer Assemblies with new

[antares]

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On 17-jan-04, at 11:37, Farrell wrote:

> If the original geometry is good, then just replace the originals with=20=

> the original-type 16 mm shanks and flanges. Abel makes 'em, and I'm=20
> sure other suppliers have them also.
>

Yes but the immediate problem you get is when you replace the original=20=

hammers as well, because in this case the weight of the hammers is very=20=

crucial.
It means getting a new hammer that weighs exactly as much as the=20
original.
There is no hammer maker who produces exactly that hammer, so you have=20=

to modify a new set of hammers and you have to almost ruin that new set=20=

of hammers to get back to the original weight.
I have seen many attempts to do so and they all looked ridiculous, the=20=

tails were still too long and in the end they were still too heavy=20
anyway because the materials used nowadays are different and weigh more=20=

than the original hammers of which for instance the original felt was=20
much less dense than VFG felt Abel uses.
More lead in the keys will complete the usual and well known=20
catastrophe.

My 2 Euro cents

Andr=E9 Oorebeek

Amsterdam -
The Netherlands

0031-20-6237357
0645-492389
0031-75-6226878
www.concertpianoservice.nl
www.grandpiano.nl






> ----- Original Message -----
> From: Michael Gamble
> To: pianotech@ptg.org
> Sent:Monday, January 12, 2004 8:58 PM
> Subject:S&S replacing Hammer Assemblies with new
>
> Hello List
> Happy New Year
> I am currently coming to terms with the need to replace an entire set=20=

> of Hammer Assemblies in a 1913 Model A S&S. There is one problem. An=20=

> important dimension (measured in mm) needs to be addressed. It seems=20=

> that on the older S&S this dimension from the Hammer Flange Centre Pin=20=

> to the core of the Roller (Knuckle) was 16mm, while those on the newer=20=

> S&S models is 17mm. To change just the Hammer Assemblies involves=20
> elongating the slot in the old Lever (Whippen) through which the Jack=20=

> does its work. It can indeed get more complex than this. One could=20
> change the Lever (Whippen) as well, but that would put the touch in=20
> the wrong place on the Key and make it necessary to replace the keys=20=

> as well. The reason for replacing the Keys is that in the old Keys the=20=

> Balance-rail would be in the wrong place - that's why the touch would=20=

> be too heavy. The new Levers do not have Spring Assists and the touch=20=

> would therefore be too heavy if the keys were not replaced as well.=20
> This option is expensive - albeit a preferred route to take were money=20=

> no object.
> Have you all read, marked and learned from Franz Mohr's book "My Life=20=

> with the Great Artists"? In this book Franz takes one along the=20
> "preferred" route quite convincingly. You know Franz, of course, as=20
> the "Head Concert Technician" to S&S.
> One thing which has not been made quite clear in S&S action diagrams=20=

> is.... precisely from where - to - where is this dimension of Hammer=20=

> Flange Center - to - Knuckle Core taken? It could be from the middle=20=

> of the Knuckle Core to the middle of the Hammer Flange Centre -=A0or=A0-=
=20
> It could be from the core-face of the Knuckle (on the Hammer side)=A0to=20=

> the middle of the Hammer Flange Centre - and there's a whole=20
> millimeter difference between the two.
> Anyone like to take up this Topic? Please?
> Regards
> Michael G (UK)
>
> <image.tiff>Keyboard tuner to Glyndebourne since 1980
>
> Michael Gamble
> Piano/Harpsichord Tuner/Tech.
> "Westwick"
> 29 Shepherds Way
> Ringmer
> Sussex BN8 5LT
> UK
>
> michael@gambles.fsnet.co.uk
>
> tel:
> fax:
> mobile:
> +44(0)1273 813612
> +44(0)1273 813612
> 07766 184580
>
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>




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