 |
Welcome to the Piano World Piano Forums
Over 3 million posts about pianos, digital pianos, and all types of keyboard instruments.
Over 100,000 members from around the world.
Join the World's Largest Community of Piano Lovers
(it's free)
It's Fun to Play the Piano ... Please Pass It On!
|
|
|
|
48 members (Dalem01, Cheeeeee, danno858, CharlesXX, Aleks_MG, accordeur, brdwyguy, Dfrankjazz, Carey, 7 invisible),
2,075
guests, and
323
robots. |
|
Key:
Admin,
Global Mod,
Mod
|
|
|
|
Joined: May 2012
Posts: 502
500 Post Club Member
|
OP
500 Post Club Member
Joined: May 2012
Posts: 502 |
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.
|
|
|
|
|
Joined: Nov 2010
Posts: 5,998
5000 Post Club Member
|
|
5000 Post Club Member
Joined: Nov 2010
Posts: 5,998 |
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.
|
|
|
|
|
Joined: May 2012
Posts: 294
Full Member
|
|
Full Member
Joined: May 2012
Posts: 294 |
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...  #hamiltonpianos http://www.hamiltonpianos.com/
|
|
|
|
|
Joined: Apr 2008
Posts: 2,481
2000 Post Club Member
|
|
2000 Post Club Member
Joined: Apr 2008
Posts: 2,481 |
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
|
|
|
|
|
Joined: Sep 2006
Posts: 3,983
3000 Post Club Member
|
|
3000 Post Club Member
Joined: Sep 2006
Posts: 3,983 |
You are early - we are not even close to April yet.
JG
|
|
|
|
|
Joined: Jan 2009
Posts: 3,489
3000 Post Club Member
|
|
3000 Post Club Member
Joined: Jan 2009
Posts: 3,489 |
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....
|
|
|
|
|
Joined: May 2012
Posts: 502
500 Post Club Member
|
|
OP
500 Post Club Member
Joined: May 2012
Posts: 502 |
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.
|
|
|
|
|
Joined: Aug 2006
Posts: 446
Full Member
|
|
Full Member
Joined: Aug 2006
Posts: 446 |
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
|
|
|
|
|
Joined: Oct 2006
Posts: 2,677
2000 Post Club Member
|
|
2000 Post Club Member
Joined: Oct 2006
Posts: 2,677 |
And with that idea, the "Goof Screw" hammer attachment is born!
|
|
|
|
|
Joined: Mar 2008
Posts: 9,230
9000 Post Club Member
|
|
9000 Post Club Member
Joined: Mar 2008
Posts: 9,230 |
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.!
|
|
|
|
|
Joined: May 2012
Posts: 502
500 Post Club Member
|
|
OP
500 Post Club Member
Joined: May 2012
Posts: 502 |
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 !
|
|
|
|
Forums43
Topics223,392
Posts3,349,302
Members111,634
| |
Most Online15,252
Mar 21st, 2010
|
|
|
|
|
|
|
