Shigeru Kawai regulation

[thepianoarts]

Kevin,

Me too.

Dan

on 9/10/01 9:53 AM, Kevin E. Ramsey at ramsey@extremezone.com wrote:

> Hello, Dan. I agree, the rep lever gets taken out of the equation once
> it contacts the drop screw; hence the term "double escapement". It's my
> understanding of it that the jack should begin escaping at the same time
> that the drop screw contacts the balancier.
> However, I wonder really how much of a contribution the rep lever makes
> to the movement of the hammer anyway; not much I would think, given the
> relatively weak condition of the spring compared to the accelerating force.
> Interesting to think about it, anyway.
> Usually, when I see too much drop on a new piano, it's because there is
> just too much aftertouch in the action, and the people at the factory put
> that much drop into it so that the hammer can't rise up so high in the
> aftertouch phase to block against the string. Easier than putting in more
> punchings, y'know.
> 
> 
> ----- Original Message -----
> From: "thepianoarts" <thepianoarts@home.com>
> To: <pianotech@ptg.org>
> Sent: Sunday, September 09, 2001 10:50 PM
> Subject: Re: Shigeru Kawai regulation
> 
> 
>> Hello Kevin,
>> 
>> This is a great area for study, yes?
>> Do you agree that the rep lever is not involved in lifting the knuckle/
>> hammer after the drop screw contacts the rep lever?
>> Dan
>> 
>> 
>> 
>> on 9/9/01 10:32 PM, Kevin E. Ramsey at ramsey@extremezone.com wrote:
>>> SNIP "What happens if the rep lever contacts the drop
>>> screw too soon? Then the jack continues to lift the knuckle further up
> all
>>> by its self, resulting in a draggy feeling at the end of the key
> stroke."
>>> 
>>> ----- Original Message -----
>>> From: "thepianoarts" <thepianoarts@home.com>
>>> To: <pianotech@ptg.org>
>>> Sent: Saturday, September 08, 2001 9:36 PM
>>> Subject: Shigeru Kawai regulation
>>> 
>>> 
>>>> 
>>>> The technicians in the Dallas/ Ft.Worth Texas part of the world were
>>>> treated to a technical this past week, on the refinments of the Shigeru
>>>> Kawai, their preimer piano line. The technician who follows a
> particular
>>>> instrument through the facory, also goes to the new owners home to
> service
>>>> it. I guess that is a one time deal, since all the techs are coming
> from
>>>> Japan. Very impressive. Any other manufactures doing that? I love it
> when
>>>> someone raises the bar.
>>>> 
>>>> There are a couple of regulation differences that are interesting.
>>>> #1-Drop is set slightly early, and #2- jack height to rep lever height
> is
>>>> set so that there is no winking. The distance (jack height to rep lever
>>>> top) is subtle, so as not to cause a hammer line wave.
>>>> I beleive the reasoning for the earlier than usual drop, is that there
>>>> is a smoother feel if drop and let-off are spaced slightly.
>>>> Also, I beleive their thinking is, an earlier drop allows a safety
>>> net
>>>> which insures a positive 'scrape' or contact by the jack, which would
> be
>>>> reduced if the drop timing is later that the let-off timing. In other
>>>> words, let the jack do it's job of lifting the hammer. Keep the spring
>>>> loaded rep lever out of the picture.
>>>> 
>>>> Dan
>>>> 
>>>> 
>>> 
>