[pianotech] regulating backchecks?

[David Ilvedson]

Al,

Sounds like a good set-up...maybe a photo or two?   

David Ilvedson, RPT
Pacifica, CA  94044

----- Original message ----------------------------------------
From: "Al Guecia/AlliedPianoCraft" <AlliedPianoCraft at hotmail.com>
To: ed440 at mindspring.com; pianotech at ptg.org
Received: 7/30/2009 4:10:40 AM
Subject: Re: [pianotech] regulating backchecks?


>I installed 5 glide bolts upside down (similar to some Baldwin grands) on 
>the front of my bench (which is a Steinway B keybed) and use them to make 
>the adjustments. The way I set them up is to use action springs to hold the 
>action firm to the bench, then I raise and lower the front glides in the 
>bench by checking the center glides as you do when bedding the action, 
>making adjustment to the front glides bolts 'til you get it right. Then I 
>check the key dip to be sure it's correct. Works great. I don't need to make 
>many adjustments in the piano after that.

>Al G



>--------------------------------------------------
>From: "Ed  Sutton" <ed440 at mindspring.com>
>Sent: Wednesday, July 29, 2009 7:56 PM
>To: <pianotech at ptg.org>
>Subject: Re: [pianotech] regulating backchecks?

>> 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
>>>
>>>
>>>
>>>
>>
>>