Jack Slipping?

[Isaac OLEG SIMANOT]

Hello

Looks like hammer tail catched by the back checks.

if you push on the hammer strong with a finger flexing the shank, while
pushing the key down, and you hear the back of the hammer making noise on
the back check, then the back checks angle is not good or the back check is
too close of the hammer.

It can be that the jack is too much on the front too. You could have moved
the button with your fingers, it is on a screw. Anyway it is something you
can see looking at the jack position under the roller, and check, playing a
little hard the note while having the other almost holding the hammer, and
see ith the jack disengage. if so it need to be a little back.

there is also an issue with bad frame bedding.

HTH(elps)

Regards.

Isaac OLEG


> -----Message d'origine-----
> De : owner-pianotech@ptg.org [mailto:owner-pianotech@ptg.org]De la part
> de Greg Casper
> Envoyé : vendredi 3 mai 2002 23:04
> À : pianotech@ptg.org
> Objet : Jack Slipping?
>
>
> I just got back from a customer who has a Kawai grand with one
> key they said
> wasn't working. Turns out it works pretty well UNLESS you strike the key
> hard. When you do that, the hammer barely even moves. It looks to me like
> the jack is sitting too far forward on the knuckle, but since I
> didn't have
> a jack screw adjusting tool with me (this was ONLY supposed to be
> a tuning..
> and stupid me didn't take all the tools) I couldn't regulate that out to
> determine if that's the ONLY issue. Any opinions on what else might cause
> this situation? The backcheck almost seemed to be catching the hammer on
> it's way UP to the strings, but since it's only happening on a strong blow
> to the key I think it just LOOKS like it's catching, since there is almost
> no upward movement of the hammer when this occurs. Ideas?
>
> Greg Casper
> San Jose, CA
>
>
>