Adjustable Action Centers

[Isaac OLEG SIMANOT]

Hello

On Erard grand from the beginning of the century was this system.

Very convenient (individual brass flanges with traditional bushing but
adjustable screw for tightness) I've never seen that on other makes, surely
a patented design, but I did not find any precise reference about it.

What make is your square ?

Regards

Isaac OLEG

> -----Message d'origine-----
> De : owner-pianotech@ptg.org [mailto:owner-pianotech@ptg.org]De la part
> de Farrell
> Envoyé : dimanche 16 septembre 2001 14:04
> À : pianotech@ptg.org
> Objet : Adjustable Action Centers
>
>
> I have been doing a bit of work on an old square grand. The hammer flanges
> are long and are split horizontally through the flange center. There is a
> screw that can be turned to tighten/ loosen the bushing fit to the center
> pin. I'm sure many or most of you have seen this. This is so
> cool. Is there
> any significant disadvantage to such a design? I can see that with the
> flange on the modern grand, size/space would limit the
> possibilities. Seems
> like it would be worth some level of redesign to be able to adjust the
> friction in this critical action center with the turn of a screw.
>
> Terry Farrell
>
>
>