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#2036871 - 02/21/13 11:35 AM Schwander Wippen Adjustments  
Joined: Dec 2012
Posts: 9
TaylorofCT Offline
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TaylorofCT  Offline
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Connecticut
Attached is a photo of the Schwander Wippen in my 1930 Wurlitzer Baby Grand with call-outs indicating the adjustment screws and what they do. I'm not a technician so please correct my descriptions.

Some questions:

• The Regulating Screw that adjusts the spring tension ... how does that actually work or does that screw perform another function?

• There's no adjustment to center the jack left and right in the slot of the repetition lever so it's not rubbing against the side. This seems like a common problem. From what I've read one way to correct it is to bend the pin where the jack toe meets the jack, which seems extreme and could very easily break the wippen. I would think there would be an easier, less invasive solution. ???

• One key behaves unpredictably ... E above middle C. Generally it's fine but too often it will be stuck in the up position. A few taps frees it. Any thoughts on what's going on?

Thanks in advance.
[img:center]http://www.flickr.com/photos/pietmiro/8494338647/in/photostream[/img]


"Nothing soothes me more after a long and maddening course of pianoforte recitals than to sit and have my teeth drilled." ~ George Bernard Shaw
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#2036899 - 02/21/13 12:22 PM Re: Schwander Wippen Adjustments [Re: TaylorofCT]  
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Silverwood Pianos Offline
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Originally Posted by TaylorofCT
Attached is a photo of the Schwander Wippen in my 1930 Wurlitzer Baby Grand with call-outs indicating the adjustment screws and what they do. I'm not a technician so please correct my descriptions.
Some questions:
• The Regulating Screw that adjusts the spring tension ... how does that actually work or does that screw perform another function?
• There's no adjustment to center the jack left and right in the slot of the repetition lever so it's not rubbing against the side. This seems like a common problem. From what I've read one way to correct it is to bend the pin where the jack toe meets the jack, which seems extreme and could very easily break the wippen. I would think there would be an easier, less invasive solution. ???
• One key behaves unpredictably ... E above middle C. Generally it's fine but too often it will be stuck in the up position. A few taps frees it. Any thoughts on what's going on?
Thanks in advance.


The rep screw works by increasing tension or decreasing tension. One of the difficulties with the Schwander whippen is when the spring gets weak it is hard to determine when the adjustment is enough or not, as there can be, at times, little or no rise in the hammer upon letting the key up.

For the jacks replacing the pin to center or remove material from one side.

On the one key there is no mention of what is stuck in the up position; hammer? Key?


Dan Silverwood
www.silverwoodpianos.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."
#2036909 - 02/21/13 12:31 PM Re: Schwander Wippen Adjustments [Re: TaylorofCT]  
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pianolive Offline
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There is a tool to put under the whippen so you can tap gently on top of the jack to bend the pin. It works fine and you set the jack exactly in the middle.

#2036911 - 02/21/13 12:34 PM Re: Schwander Wippen Adjustments [Re: pianolive]  
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Silverwood Pianos Offline
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Originally Posted by pianolive
There is a tool to put under the whippen so you can tap gently on top of the jack to bend the pin. It works fine and you set the jack exactly in the middle.


Hi pianolive.
I didn't know there was a tool for that one. Good one.


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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#2036913 - 02/21/13 12:37 PM Re: Schwander Wippen Adjustments [Re: TaylorofCT]  
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TaylorofCT Offline
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Connecticut
Dan: The key is stuck in the up position.


"Nothing soothes me more after a long and maddening course of pianoforte recitals than to sit and have my teeth drilled." ~ George Bernard Shaw
#2036915 - 02/21/13 12:39 PM Re: Schwander Wippen Adjustments [Re: Silverwood Pianos]  
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pianolive Offline
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Dan, I will send you a picture with measures so you can have one made.

#2036926 - 02/21/13 12:53 PM Re: Schwander Wippen Adjustments [Re: pianolive]  
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Silverwood Pianos Offline
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Originally Posted by pianolive
Dan, I will send you a picture with measures so you can have one made.


Good idea pianolive thanks. I just sent you an email...


Dan Silverwood
www.silverwoodpianos.com
http://silverwoodpianos.blogspot.com/
http://www.facebook.com/SilverwoodPianosDotCom
"If you think it's expensive to hire a professional to do the job, wait until you hire an amateur."
#2036928 - 02/21/13 12:56 PM Re: Schwander Wippen Adjustments [Re: TaylorofCT]  
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Originally Posted by TaylorofCT
Dan: The key is stuck in the up position.


Could be the back check stopping the hammer.

Could be the front rail pin under the key (key set too high at rest.)

Something preventing the whippen from moving.

Instead of tapping to release the key find out why it is stopped. What prevents the motion….


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."
#2036929 - 02/21/13 12:56 PM Re: Schwander Wippen Adjustments [Re: TaylorofCT]  
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I wonder about the process of tapping on the jack, and whether you are bending the pin, or crushing the wood and enlarging the holes.


Semipro Tech
#2036930 - 02/21/13 12:57 PM Re: Schwander Wippen Adjustments [Re: TaylorofCT]  
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often the upper lever is bend or twisted on its support with those kind of whippens.

Bend the jack on the side it need is the common correct method (on the side of a hard wood block or metal support if no special tool available, while a tool at a correct height to do that on most actions would be nice)

One need a perfect screwdriver in case the spring regul.screw is hard to move. It can be good to help the spring a little by working on the coil, before regulation.

I have baught the last Schwander type whippens made by Renner some 10 years ago wink

There is a way to straighten a center if replacing it with along one, using a firm support.

But for the jacks, even on a new action (with modern whippens) some of them may need to be hammered, just to center them perfectly (rare but possible)...

Those kind of spring are raising slower the hammer than the usual V spring


Last edited by Olek; 02/21/13 12:58 PM.

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#2037435 - 02/22/13 11:42 AM Re: Schwander Wippen Adjustments [Re: Silverwood Pianos]  
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TaylorofCT Offline
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Another centering problem is aligning the jack toe with the let-off button. I'm thinking that the first course of action is to move the entire wippen by loosening the wippen flange. Please advise.

Again thanks to all for sharing your expertise.


"Nothing soothes me more after a long and maddening course of pianoforte recitals than to sit and have my teeth drilled." ~ George Bernard Shaw
#2037480 - 02/22/13 01:04 PM Re: Schwander Wippen Adjustments [Re: TaylorofCT]  
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The hammers are mated to the strings. The whippen is mated to the knuckle. The jacks are centered in the mortise.

As long as let-off happens the part of the button used is of little consequence. Sure it would be nice to have all of the parts line up correctly but in a 85 yr old instrument that is not going to be the reality.


Dan Silverwood
www.silverwoodpianos.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."
#2037484 - 02/22/13 01:10 PM Re: Schwander Wippen Adjustments [Re: TaylorofCT]  
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It is often not the reality in an 85 hour old piano, but you can get close.


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