Major Grotrian problem

[Richard Brekne]

A quick check to see whether you've mismatched hammer weight in the bass 
is to simply add a bit onto shank out next to the hammer. Add say 2 
grams out there in some temporary fashion.  If your hammer and key do 
more or less what they are supposed to do then you have a problem with 
hammer weighting.  If this turns out to be the case, then you really 
need to get some help. While action balancing is not all that difficult 
conceptually, you should already know how to do this before getting into 
a hammer replacement job... not criticism meant here... many of us have 
been in this boat at some time... but get somebody who can help you.

Do you know how to measure hammer weight ? You are more or less stuck 
with radius weight now that the hammers are glued to the shanks... which 
is a good way to take hammer weight anyways... Check out David Stanwoods 
website for some good action balancing basics.

http://www.stanwoodpiano.com/seesaw.pdf

Cheers
RicB

Ajay Mistry wrote:

>Hello list am working on an Grotrian action had
>ordered new complete hammers ie hammer glued to new
>shank fitted with flange also prevoiced by Grotrian
>also I changed the key leads which were made by me
>here in my workshop now I am finding a major problem
>when I fitted the new hammers to the action & play the
>notes bass particularly the key stays depressed &
>hammer in mid air when I lift the key with my hand the
>hammer falls checked the bushings loose enough none of
>the keys are touching each other I think the leads
>have become to heavy how do I rectify this have heard
>of up-weight & down-weight how do I calculate that can
>any one explain the procedure to me & how much should
>there be on this piano.
> 
>        Really in lot of trouble please help guys.
>
>                                            Ajay.
>
>=====
>Ajay Mistry
>
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