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#2033546 - 02/15/13 06:39 AM Fixing Hammers to Shanks
Goof Offline
Full Member

Registered: 05/05/12
Posts: 398
Loc: UK
Looking at upright pianos it strikes me that there is the possibility to make a metal device which, if the shank was allowed to protrude through the hammer,could do away with gluing the hammer to the shank.
I visulise an inverted U shaped clip to clamp the hammer; to the top of the U would be fixed a tube, through yhid tube the extended shank would pass and be secured by a small grub screw.
I suppose there is not much of a call for such a device but it would make fitting new hammers easier.
Any one ever seen such a device?
What would be the problems - assuming that the "gadget" would be relatively light.
Sorry but I've not got out my old balance to test but looking at the set of weights I would estimate about 2gm.

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#2033559 - 02/15/13 07:18 AM Re: Fixing Hammers to Shanks [Re: Goof]
ando Offline
4000 Post Club Member

Registered: 11/23/10
Posts: 4801
Loc: Melbourne, Australia
I always assumed glueing was necessary because the hammer transmits considerable vibrations and force to the shank (and vice-versa). Any clamping arrangement on a soft material like wood would be likely to be brought loose by the constant percussive blows. Once they start moving, they would get worse and worse and probably result in broken shanks or at least deform them. The other reason is probably the weight. Hammers don't get changed out that often anyway. Probably not worth making a system designed for fast changeover on a procedure that only happens once or twice in a lifetime.

Those are my guesses but I'm not a piano tech, more of an amateur inventor and physicist. I'll leave the solid conclusions to the experts.

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#2033567 - 02/15/13 07:44 AM Re: Fixing Hammers to Shanks [Re: Goof]
Adypiano Offline
Full Member

Registered: 05/02/12
Posts: 68
Loc: Surrey, UK
Spot on Ando...

Also, depending on the action geometry, 2g extra at the hammer would equate to about 8g extra force needed at the key.
_________________________
Started work at the Blüthner piano re-building workshop in Perivale, UK, in 1989. Self employed since 2000. Learning something new about pianos every day... smile

http://www.hamiltonpianos.com/

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#2033584 - 02/15/13 08:21 AM Re: Fixing Hammers to Shanks [Re: Goof]
Emmery Offline
2000 Post Club Member

Registered: 04/02/08
Posts: 2481
Loc: Niagara Region, On. Canada
A small grub/set screw would exert so much pressure to do its job, the wood shank would simply crush below it.
_________________________
Piano Technician
George Brown College /85
Niagara Region

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#2033678 - 02/15/13 11:37 AM Re: Fixing Hammers to Shanks [Re: Goof]
Supply Offline
3000 Post Club Member

Registered: 09/11/06
Posts: 3919
Loc: Vancouver Island, BC, Canada
You are early - we are not even close to April yet.
_________________________
Jurgen Goering
Piano Forte Supply
www.pianofortesupply.com

Piattino Caster Cups distributor

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#2033704 - 02/15/13 12:35 PM Re: Fixing Hammers to Shanks [Re: Goof]
beethoven986 Offline
3000 Post Club Member

Registered: 01/20/09
Posts: 3489
Originally Posted By: Goof
Looking at upright pianos it strikes me that there is the possibility to make a metal device which, if the shank was allowed to protrude through the hammer,could do away with gluing the hammer to the shank.
I visulise an inverted U shaped clip to clamp the hammer; to the top of the U would be fixed a tube, through yhid tube the extended shank would pass and be secured by a small grub screw.
I suppose there is not much of a call for such a device but it would make fitting new hammers easier.
Any one ever seen such a device?
What would be the problems - assuming that the "gadget" would be relatively light.
Sorry but I've not got out my old balance to test but looking at the set of weights I would estimate about 2gm.


What the....? How would this make fitting hammers easier? Have you ever installed hammers before? It doesn't get any easier than it already is, and if you can't handle that, then, yeah....

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#2034608 - 02/17/13 06:14 AM Re: Fixing Hammers to Shanks [Re: Goof]
Goof Offline
Full Member

Registered: 05/05/12
Posts: 398
Loc: UK
Thanks for the "humor" - just a thought which did bring some reasonable insight!
But! I might be inclined to wager that at some time in the future, using carbon fiber shanks, some modifications in this direction may/might take place.

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#2034762 - 02/17/13 01:16 PM Re: Fixing Hammers to Shanks [Re: Goof]
tds Offline
Full Member

Registered: 08/30/06
Posts: 446
Loc: Bastrop, Texas
Originally Posted By: Goof
Thanks for the "humor" - just a thought which did bring some reasonable insight!
But! I might be inclined to wager that at some time in the future, using carbon fiber shanks, some modifications in this direction may/might take place.


Maybe so, but my guess is that most manufacturers would view that many extra grub screws as 88 more chances for rattles in the action.
_________________________
Stay tuned.

Tom Seay, Recovering Piano Technician
Bastrop, Texas

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#2035032 - 02/17/13 10:56 PM Re: Fixing Hammers to Shanks [Re: Goof]
David Jenson Offline
2000 Post Club Member

Registered: 10/22/06
Posts: 2538
Loc: Maine
And with that idea, the "Goof Screw" hammer attachment is born!
_________________________
David L. Jenson
Tuning - Repairs - Refurbishing
Jenson's Piano Service
-----

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#2035098 - 02/18/13 02:57 AM Re: Fixing Hammers to Shanks [Re: Goof]
Olek Offline
9000 Post Club Member

Registered: 03/14/08
Posts: 9230
Loc: France
you dont need glue or clip then, just cut the shank in its middle and use a wedge. But this will not stay for long
_________________________
Professional of the profession.
Foo Foo specialist
I wish to add some kind and sensitive phrase but nothing comes to mind.!

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#2035449 - 02/18/13 07:20 PM Re: Fixing Hammers to Shanks [Re: Olek]
Goof Offline
Full Member

Registered: 05/05/12
Posts: 398
Loc: UK
With carbon fiber shanks it will be easy to incorporate a tang, metal or cf formed, this would be below the hammer so that a screw or bolt through this could could secure the hammer very "securely".
Incedently reading articles by Anders Asekenfelt - Royal Institute of Technology in Stockholm - mention is made of a hammer made from a polyurethane elastomer. That should be interesting !

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