[pianotech] regulating backchecks?

Ed Sutton ed440 at mindspring.com
Wed Jul 29 17:56:09 MDT 2009


If you're taking the action home:

1) Bed the action in the piano

2) In the piano, remove four front key wool punchings, at the ends and 
middle of keyboard, and replace with cardboard punchings to make unambiguous 
match to the dip block.

3) Put the action on your bench, mark the location with clamp blocks or 
tape, shim with index cards until the measured keys match the dip block 
again.

4) Tape the cards to the bench top.

es
----- Original Message ----- 
From: "David Andersen" <david at davidandersenpianos.com>
To: <pianotech at ptg.org>
Sent: Wednesday, July 29, 2009 5:54 PM
Subject: Re: [pianotech] regulating backchecks?


>
> On Jul 29, 2009, at 11:07 AM, jim ialeggio wrote:
>
>> What I really want is a reliable protocol to prove that the bench  top 
>> keybed is precisely matching the piano's keybed.
>>
>> Any ideas out there?
>
> I'm continually surprised more technicians don't make use of the two 
> simple ways I've found to recreate exact key travel outside the piano:
>
> ---get real good at using a dip block (I use a hardwood 10mm) then  either
>
> 1. get an Edwards Action Trolley and recreate exact key travel by its 
> method...excellent and precise; or
>
> 2. when the action is in your lap, put a cheekblock face down on one  knee 
> under the balance rail and oonch around, move that leg, until you  find 
> the point where the key travel becomes exactly what it was in the  keybed. 
> Doing it will show you what I mean, and either protocol will  create a 
> sharp rise in your regulation precision and get you real,  real friendly 
> with your dip block.
>
> David Andersen
>
>
>
> 



More information about the pianotech mailing list

This PTG archive page provided courtesy of Moy Piano Service, LLC