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#2037065 - 02/21/13 04:46 PM Changing Bushings
greatlifestyle Offline
Full Member

Registered: 02/13/13
Posts: 43
Loc: Mexico
Hello. I was just wondering, do you feel any difference when the balance and front rail bushings are replaced? (besides leveling)?

What about the key bushings?

Why would you want to replace the three of these?

Thanks

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#2037071 - 02/21/13 04:53 PM Re: Changing Bushings [Re: greatlifestyle]
BDB Online   content
Yikes! 10000 Post Club Member

Registered: 06/07/03
Posts: 22771
Loc: Oakland
The key bushings are the front rail and balance rail bushings. They keep the keys from wobbling side to side.
_________________________
Semipro Tech

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#2037089 - 02/21/13 05:14 PM Re: Changing Bushings [Re: greatlifestyle]
Ed McMorrow, RPT Online   content
3000 Post Club Member

Registered: 12/09/12
Posts: 3021
Loc: Seattle, WA USA
Key bushings are usually the first thing to wear out on a well made piano. Lot's of elasticity elements and humidity response to deal with there when replacing them. You might want to get some salvage keys to practice removing and installing new key-bushings. Two rules when installing the new felt; too much felt and too much glue is bad.
_________________________
In a seemingly infinite universe-infinite human creativity is-seemingly possible

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#2037101 - 02/21/13 05:23 PM Re: Changing Bushings [Re: greatlifestyle]
BDB Online   content
Yikes! 10000 Post Club Member

Registered: 06/07/03
Posts: 22771
Loc: Oakland
Too little felt and too little glue is bad, too!
_________________________
Semipro Tech

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#2037113 - 02/21/13 05:49 PM Re: Changing Bushings [Re: BDB]
greatlifestyle Offline
Full Member

Registered: 02/13/13
Posts: 43
Loc: Mexico
Ok. but, do you feel the difference?
and the front rail bushings, I meant the circles fo felt that go under the keys in the keybed

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#2037127 - 02/21/13 06:03 PM Re: Changing Bushings [Re: greatlifestyle]
BDB Online   content
Yikes! 10000 Post Club Member

Registered: 06/07/03
Posts: 22771
Loc: Oakland
Keybed cloth and punchings are not the same as key bushings.

You can feel the difference if the old material is worn or hard enough.
_________________________
Semipro Tech

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#2037131 - 02/21/13 06:06 PM Re: Changing Bushings [Re: greatlifestyle]
Silverwood Pianos Offline
4000 Post Club Member

Registered: 03/10/08
Posts: 4263
Loc: Vancouver B. C. Canada

Originally Posted By: Ed McMorrow, RPT
too much felt and too much glue is bad.


Originally Posted By: BDB
Too little felt and too little glue is bad, too!


Yes the cloth and glue have to be just right.

What nice key bushings you have my dear……
_________________________
Dan Silverwood
www.silverwoodpianos.com
http://silverwoodpianos.blogspot.com/
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"If you think it's expensive to hire a professional to do the job, wait until you hire an amateur."

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#2037133 - 02/21/13 06:10 PM Re: Changing Bushings [Re: greatlifestyle]
Olek Offline
8000 Post Club Member

Registered: 03/14/08
Posts: 8502
Loc: France
I dont know I change the piano when the bushings are worn (as the car when the ashtray is full)

The keys are providing equilibriuml to the hand and optimpal energy to the whippen

*The keys are providing a firm support to the hammer tail (hence better tone)

The key when they have too much play, develop pulley (front to back)à and then wear on backchecks

A simple vacuuming of the mortises from time to time (plus some talcumm or other lube in the cloth of the balance mortise) will help the cloth to last longer (some use CLP in bushing cloth, I dont know if it is efficient)

font pins are often lightly lubed (tallow/cork grease), it protects from corrosion.

First grad new front punchings (22 mm large for grands) are better than worn and too soft or too hard old punching (I copy DBD there !) will need a little time to settle, however


Edited by Olek (02/21/13 06:14 PM)
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Professional of the profession.
Foo Foo specialist
I wish to add some kind and sensitive phrase but nothing comes to mind.! Euh.... sorry for the lengthy postings, I cannot refrain writing !

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#2037135 - 02/21/13 06:12 PM Re: Changing Bushings [Re: greatlifestyle]
Olek Offline
8000 Post Club Member

Registered: 03/14/08
Posts: 8502
Loc: France
WHite PVCA glue easily harden the cloth then the wear is faster. but good white glue in very little quantity is OK.

the glue must saty at the felt surface only a little goes inside.
_________________________
Professional of the profession.
Foo Foo specialist
I wish to add some kind and sensitive phrase but nothing comes to mind.! Euh.... sorry for the lengthy postings, I cannot refrain writing !

https://secure.avaaz.org/en/save_africas_lions_loc/?tcltqeb

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#2037193 - 02/21/13 08:09 PM Re: Changing Bushings [Re: Olek]
Monaco Offline
Full Member

Registered: 07/28/11
Posts: 387
Loc: GA
I definitely feel a difference when playing a piano with worn out bushings. They feel sloppy.
_________________________
Ben Ereddia
Piano Teacher
Beginning Tech

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#2037209 - 02/21/13 08:33 PM Re: Changing Bushings [Re: Silverwood Pianos]
David Jenson Online   content
2000 Post Club Member

Registered: 10/22/06
Posts: 2448
Loc: Maine
Originally Posted By: Silverwood Pianos

Originally Posted By: Ed McMorrow, RPT
too much felt and too much glue is bad.


Originally Posted By: BDB
Too little felt and too little glue is bad, too!


Yes the cloth and glue have to be just right.

What nice key bushings you have my dear……
Tonight is literary night. Oh goodie! 'Shades of Little Red Riding Hood and The Three Bears.
_________________________
David L. Jenson
Tuning - Repairs - Refurbishing
Jenson's Piano Service
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