small vertical key flop

[Barrie Heaton]

Hi Audrey,

First of all check the obvious the spiral springs to see if they have
not weakened with heavy use.

You can regulate this problem out, the Langer 80 action is very
suseptive to repition failiure.  To overcome this problem I re-regulate
to the following,

Set the blow to 44 mm
set the let off to 2 mm
set the checking to 12 mm
set the depth of touch to 9.5 mm

You must have firm front touch washers for this close a tolerance.  When
regulated turn the jack slap rail as close to the jacks as possible
before it  interferes with the jacks.

What you are basically doing is altering the angle of attack at which
the jack meets the knuckle therefore, with the angle of attack reduced
when the jack returns under the knuckle.  There is less leather for the
jack  to come in contact with, thus reducing friction.  Also you may
consider putting some antifriction material on the balance pins and bat
pins.  Take a look at the butt springs (if it has them) to see if the
tension is too great.

If all else fails its re-lead..... the keys I'm afraid :-(

Good luck,

Kind regards,

Barrie.





In article <961118133104_1083217065@emout01.mail.aol.com>,
AKarab@aol.com writes
>This question, which I am eager to hear about too, comes from my partner Jack
>Lofton who ran into a particularly challenged action this week:
>
>"There is that annoying tendency for keys of some vertical pianos to be
>weighted so heavily towards the front that it interferes with repetition
>[jack doesn't return under butt, lost motion is soaked up by key flop] and
>sometimes even key return.  Is there any solution short of reweighting the
>keys?"
>[he and I were discussing brands that do not use wippen flange springs]
>
>I encouraged him to submit the question as I'm sure there are cheap practice
>room pianos someplace that you pros have had to render useful.  I've seen
>jiffy weights tacked on (sometimes just on the offenders, not all keys!) but
>of course what goes down must first go up so that's in the reweighting by
>adding instead of subtracting category, blegh.
>
>Looking forward,
>Audrey Karabinus,  Seattle
>





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Barrie Heaton                                  |  Be Environmentally Friendly
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