wippen assistance please

[David Love]

When I use them (which isn't often) I like to use them for about 9 grams
worth of BW which means that you adjust enough tension so that the wippens
basically float, i.e. zero weight bearing on the capstan.  You can certainly
go higher but I prefer not above 15 grams.  How you use them will depend on
your methodology and whether you have a screw adjust or a manual type.
Personally, I don't use them unless I'm using a screw adjust which means
Tokiwa which is why I don't use them often preferring Renner parts.  I do
wish Renner would make a screw adjust. 

 

At any rate, the method is to weigh off the action with the springs detached
with a balance weight 9 grams (or whatever you choose) heavier than you want
to end up with.  Then engage the springs and adjust the tension until you
have a uniform BW.  If you've put your UW and DW on a spread sheet Stanwood
style, it's quite easy and you can go through and basically adjust tension
to achieve your new targeted UW or DW.  

 

David Love
davidlovepianos at comcast.net
www.davidlovepianos.com 

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Joe And Penny Goss
Sent: Saturday, March 15, 2008 4:01 PM
To: Pianotech List
Subject: Re: wippen assistance please

 

Hi Wim,

The assist spring at the back of the wippen.

Joe Goss RPT
Mother Goose Tools
imatunr at srvinet.com
www.mothergoosetools.com

----- Original Message ----- 

From: Willem Blees <mailto:wimblees at aol.com>  

To: pianotech at ptg.org 

Sent: Saturday, March 15, 2008 3:45 PM

Subject: Re: wippen assistance please

 

Joe

 

The rule of thumb is that after the hammer has checked, the hammer should
"rise gently" when the key is released. What is considered "a gentle rise"
varies, but I've always felt that a small but significant rise is good. If
there is a kick, it's too strong. You should also feel the release on the
key. (In actuality, the wippen pushes the key down, but we see it as a the
hammer rising. 

But there are lots of things that effect the spring tension. The most
important thing is where the hammer checks. Too high or too low will give
you different results. With that comes correct key dip. The other thing that
will effect rep spring tension is the spring groove. It needs to be clean
but lightly lubricated. 

How to adjust the springs on various models is another subject. 

I hope this information helps you.

For what it's worth, just yesterday I thought about putting together a
technical on this exact subject for one of our chapter meetings. So any
additional comments and suggestions will be greatly appreciated. 


Willem (Wim) Blees, RPT
Piano Tuner/Technician
Honolulu, HI
Author of 
The Business of Piano Tuning
available from Potter Press
www.pianotuning.com



-----Original Message-----
From: Joe And Penny Goss <imatunr at srvinet.com>
To: Pianotech <pianotech at ptg.org>
Sent: Sat, 15 Mar 2008 11:59 am
Subject: wippen assistance please

Hi all,
I have never seen on this list the mention of what to look for in setting
the wippen assist springs.
Any one care to give it a go? Havt A Samick Ihat has a problem that may be
related to the spring tension.
Joe Goss RPT
Mother Goose Tools
imatunr at srvinet.com
www.mothergoosetools.com <http://www.mothergoosetools.com/> 
 

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