[CAUT] Some like it Hot/Some like it Cold!

[Keith Roberts]

I think that because of the flex of the parts, the key hits the punching
before letoff on strong blows. As a static or partial dynamic analysis, you
are right.
Keith

On Mon, May 19, 2008 at 5:55 PM, Dan Reed <pianoarts at tx.rr.com> wrote:

> Science please...
>
> The jack has escaped, the energy has been transfered, "then" the front rail
> punching is contacted...
>
> Where is the science of how the tone is effected by a hard or soft landing?
>
> Dan
>
>
>
> On May 19, 2008, at 7:07 PM, Jon Page wrote:
>
> A conical Crescendo punching will focus the tone.
>>
>> Being a firmer punching there is less compression on a hard blow
>> so the dip (after touch) is more even between pp and ff.
>>
>> The straight-sided Crescendo punchings do not have the same tonal focus
>> effect but are an improvement over the standard woven punchings.
>>
>> At the KC Convention I tested these with a few people at hand. The
>> straight-sided punchings improved the tone over the woven punchings
>> and the conical-sided punchings were a tonal improvement over the
>> straight-sided ones. The conical-shape or tapered sides do make a
>> difference.
>>
>> If you turn it upside down the effect is negated. I've displayed this to
>> customer's amazement.
>>
>> Recently, I received a fairly new studio upright in my shop. I noticed
>> that there
>> were voicing issues. When I disassembled it, there were woven
>> conical/tapered f/r punchings. I knew what some of the voicing problem
>> was... some punchings were
>> inverted. I placed all the punchings with the narrow side up, problem
>> solved.
>>
>> They are too firm for some pianos causing noticeable impact sound.
>> On those pianos the pear green punchings work well.
>>
>> As for the 3/4" punchings, they do not offer as much support and can allow
>> the key to rock side to side more easily than the wider ones. I would use
>> these
>> on a spinet or something else of no consequence.
>> --
>>
>> Regards,
>>
>> Jon Page
>>
>>
>
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