Changing Bushings

Posted by: greatlifestyle

Changing Bushings - 02/21/13 04:46 PM

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
Posted by: BDB

Re: Changing Bushings - 02/21/13 04:53 PM

The key bushings are the front rail and balance rail bushings. They keep the keys from wobbling side to side.
Posted by: Ed McMorrow, RPT

Re: Changing Bushings - 02/21/13 05:14 PM

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.
Posted by: BDB

Re: Changing Bushings - 02/21/13 05:23 PM

Too little felt and too little glue is bad, too!
Posted by: greatlifestyle

Re: Changing Bushings - 02/21/13 05:49 PM

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
Posted by: BDB

Re: Changing Bushings - 02/21/13 06:03 PM

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.
Posted by: Silverwood Pianos

Re: Changing Bushings - 02/21/13 06:06 PM


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……
Posted by: Olek

Re: Changing Bushings - 02/21/13 06:10 PM

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
Posted by: Olek

Re: Changing Bushings - 02/21/13 06:12 PM

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.
Posted by: Monaco

Re: Changing Bushings - 02/21/13 08:09 PM

I definitely feel a difference when playing a piano with worn out bushings. They feel sloppy.
Posted by: David Jenson

Re: Changing Bushings - 02/21/13 08:33 PM

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……
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