Capstan angle S&S Uprights

[Michael Gamble]

Hello Sarah, David and List
On this subject I have already posted an extract from Max Matthias book 
"Steinway Service Manual" published by Verlag Erwin Bochinsky.
Relating to Steinway uprights, page 165 it states (inter alia):
- Modifying the wippen lever. This is done by adjusting the capstan screws 
to the rear or front. (13mm factory    setting on  Model K, 10 mm on Model 
V, front edge of the capstan screw to front edge of wippen heel).  Adjusting 
the capstan screw to the front results in lighter touch. This tends to 
reduce after-touch.
Hope this helps!
Michael G.(UK)
----- Original Message ----- 
From: "David Love" <davidlovepianos@comcast.net>
To: "'Pianotech'" <pianotech@ptg.org>
Sent: Monday, April 18, 2005 2:53 PM
Subject: RE: Capstan angle


> I'm not talking about the overlapping holes, you can simply plug the old
> ones.  Flipping the angle will move the capstan contact point on the key
> well away from the balance rail reducing the mechanical advantage
> considerably (assuming the contact point on the wippen heel remains the
> same.  Likely you would not have room under the heel to maintain the
> same capstan/key contact point and have the top of the capstan centered
> in any way under the wippen, if even contacting it at all.  You could,
> of course, cut off the wippen heel and relocate it, you would then have
> to recalculate the new wippen lever ratio into the equation.
>
> David Love
> davidlovepianos@comcast.net
>
> -----Original Message-----
> From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On
> Behalf Of Sarah Fox
> Sent: Sunday, April 17, 2005 9:46 PM
> To: Pianotech
> Subject: Re: Capstan angle
>
> Hi David,
>
>> Flipping the angle the other way is not so easy unless you are going
> to
>> make new keys.
>
> That's pretty much what I had concluded.  I was content with the SWR
> about
> where it was, and there was no need to reposition the capstan.  Flipping
> the
> capstan angle while preserving the position of the head would result in
> overlapping holes.  Bummer....
>
>> Unfortunately, the original angle often places the
>> capstan so as to give the proper key ratio.  Flipping the angle the
>> other way will likely result in a rather high overall action ratio.
>
> You mean because of the contact point on the capstan being in the middle
> of
> the head, rather than on the far edge???
>
> Ah well...  It's not something I'm burning to do.  ;-)
>
> Peace,
> Sarah
>
>
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