Key dip

[Clyde Hollinger]

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Julie,

Yes, it makes sense.  You sanded at the balance rail, of course.  When
changing the height of the keys at the balance rail, one has to be sure
the whole key doesn't end up too low, with the front lips getting too
close to the keyslip when the key is pressed down.  But I wonder if this
is an efficient way to solve the problem.  We must consider efficiency
when we charge for our time, but I don't see why it wouldn't work.  I
just never tried it.

How thick were the balance rail punchings?  Since this was in a piano
school, might another class or student have used punchings that were too
thick?  Schaff has them in five thicknesses.  But I'm sure your teacher
knows that.

Regards, Clyde

Alpha88x@aol.com wrote:

> Clyde,
>
>         In my experience at school, there was a similar problem in a
> studio upright in one of the rooms at school. There were no punchings
> that could be removed except the the cloth ones from under the balance
> rail. Our teacher suggested that the key itself may have swelled from
> moisture and never shrunk back and the whole key lever may be a slight
> bit bigger (hence sit higher on the balance rail than originally made
> to).
>         We took about a 150 sandpaper and sanded off a slight bit to
> bring the key back down. It worked. But we only sanded a few
> thousandths. When one sands, the bottom of a key, it must be sanded a
> bit, put back tested then removed, sanded a bit more, checked again
> and one has to keep repeating the process until the desired height is
> achived (Just a possiblity) Does this make sense?
>
> Julie
> Reading
>
>
> In a message dated 11/6/03 6:33:33 AM Eastern Standard Time,
> cedel@supernet.com writes:
>
>
>> Friends,
>>
>> While tuning a 1980 Wurlitzer studio piano today I noticed some of
>> the
>> bass hammers would damp the strings depending on how they were
>> played.
>> Letoff was fine, but there was too much keydip, resulting in the
>> backchecks pushing the hammers into the strings after letoff.
>>
>> It appears to me that all other specs will be in the correct range
>> if
>> the keydip is reduced.  Can this be done by shimming up the front
>> rail
>> of the key frame, if there are no shims to remove from under the
>> balance
>> rail?  I've never tried this.  I could put card punchings under all
>> the
>> front felt punchings, I know.  Advice?
>>
>> Regards, Clyde
>>
>
>
>

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