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#1970453 - 10/08/12 07:07 PM Bushings
Grandman Offline
Full Member

Registered: 08/18/12
Posts: 114
Loc: Usa
My grand piano had a stuck key. The dealer sent a person over to the home who used a tool to squeeze the bushing felt. This resolved the problem, but the key now has more play left and right than the other keys around it. Did he ruin the bushings in the key by squeezing the felt? IF so, what are the consequences of ruined bushings? Forgive my layman's ignorance.

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#1970463 - 10/08/12 07:32 PM Re: Bushings [Re: Grandman]
Mark Cerisano, RPT Offline
500 Post Club Member

Registered: 01/24/10
Posts: 796
Loc: Montreal, Quebec, Canada
Yes, the tech squeezed the bushing too much. This may result in some lost energy going to the string and a slightly "disconnected" feel. It is ok if the key moves side to side. If you hear noise as you move it side to side, there is too much slack. The pin is oval so you can turn it and take out the slack if it bothers you. The tech may come back and do that free of charge. Or just use an adjustable wrench (no teeth so won't scratch pin). Better yet, use some thin cloth between the wrench and the pin, just to be sure not to scratch it. A scratched pin will just wear away the felt prematurely.
Hope that helps.
_________________________
Mark Cerisano, RPT
www.howtotunepianos.com

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#1970467 - 10/08/12 07:47 PM Re: Bushings [Re: Grandman]
beethoven986 Offline
3000 Post Club Member

Registered: 01/20/09
Posts: 3297
It's likely not so much the bushing itself as it is the wood that the bushing is glued to. If too much pressure is applied, the wood gets crushed, and then there is too much play. This is reversible by any of several methods: 1. the bushings can be steamed and then resized 2. you can replace the bushing with thicker felt and resize 3. apply VS Profelt to affected bushings with sizing caul in the hole. Simply turning the key pin is an unacceptable fix for the long term, IMO.
_________________________
B.Mus. Piano Performance 2009
M.Mus. Piano Performance & Literature 2011
PTG Associate Member
Certified Dampp-Chaser installer

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#1970506 - 10/08/12 09:15 PM Re: Bushings [Re: Grandman]
BDB Online   content
Yikes! 10000 Post Club Member

Registered: 06/07/03
Posts: 20766
Loc: Oakland
Or the bushings can be needled.
_________________________
Semipro Tech

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#1970558 - 10/08/12 11:14 PM Re: Bushings [Re: beethoven986]
kpembrook Online   content
1000 Post Club Member

Registered: 04/06/10
Posts: 1253
Loc: Michigan
When the mortise if over-squeezed, it is possible to massage the wood on the part of the mortise facing the keyframe front rail and thereby get the wood inside the mortise to bulge back out.

I learned this technique at Yamaha's Little Red Schoolhouse many years ago. It is essential to have a technique for correcting an excess squeeze. Otherwise, it's just like only being able to increase tension but not reduce it when tuning. You have to know how to go both ways.
_________________________
Keith Akins, RPT
USA Distributor for Isaac Cadenza hammers and Profundo Bass Strings
Supporting Piano Owners D-I-Y piano tuning and repair

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#1970765 - 10/09/12 12:14 PM Re: Bushings [Re: Grandman]
Ed Foote Offline
500 Post Club Member

Registered: 05/03/03
Posts: 984
Loc: Tennessee
Greetings,
Yes, you had a clumsy tech, or a great one on a bad day, who knows?
Turning the front pin will take up some of the slack, and for the first 4 or 5 degrees, doesn't lose any surface area. If you have to turn the pin further than that, you will begin using just the outer edges of the pin and wear will accelerate due to too little area bearing the load.

As mentioned, a needle into the wood behind the bushing is good for .005-.010", you can do this on both sides, (well, the guy who screwed up the mortise should do it on both sides). When I have had to do this, I use a large pin to make the hole and a small toothpick to pack some thin glue in it. It works, but I don't like it.

Some of the softest mortises I have seen have been in the Pratt Read key sets of the 1960's. Even in high end pianos, the wood seemed like the softest sugar pine, and every now and then the mortise would just collapse as the bushing was eased. This overdoing it can best be avoided if I think speed rather than force when squeezing. I have messed up enough keys in my lifetime so that now I think "Sloooww" every time I pick up my easing pliars.
I will add that since I began using oversized felt with cauls and VS Pro-felt, I rarely touch the easing pliers.
Regards,


Edited by Ed Foote (10/09/12 12:16 PM)

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#1970775 - 10/09/12 12:35 PM Re: Bushings [Re: Grandman]
bkw58 Offline

Silver Supporter until December 19, 2014


Registered: 03/14/09
Posts: 1309
Loc: Conway, AR USA
Is the key bushing tightening tool no longer recommended?


Edited by bkw58 (10/09/12 12:36 PM)
_________________________
Bob W.
Piano technician, retired
Conway, AR

Piano Technicę Blog

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#1970914 - 10/09/12 05:27 PM Re: Bushings [Re: Grandman]
Grandman Offline
Full Member

Registered: 08/18/12
Posts: 114
Loc: Usa
Thanks to all. However, how can I tell if the movement from side to side is excessive as oppose to being within an acceptable range? I can hear a small clicking noise when moving from side to side, but it doesn't seem to affect playing.

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#1971211 - 10/10/12 08:31 AM Re: Bushings [Re: Grandman]
bkw58 Offline

Silver Supporter until December 19, 2014


Registered: 03/14/09
Posts: 1309
Loc: Conway, AR USA
Originally Posted By: Grandman
Thanks to all. However, how can I tell if the movement from side to side is excessive as oppose to being within an acceptable range? I can hear a small clicking noise when moving from side to side, but it doesn't seem to affect playing.


On rare occasion, after a key has been eased the bushing can become dislodged (e.g. from either incomplete glue coverage to start with or in the case of an older instrument, brittleness) in which case the key itself may not have been over-eased at all. I've even seen bushing cloth fall out completely. What you are hearing could be symptomatic of this and the tech will know one way or the other when he checks it for you.


Edited by bkw58 (10/10/12 08:58 AM)
_________________________
Bob W.
Piano technician, retired
Conway, AR

Piano Technicę Blog

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