Different Keystrokes In Piano Tuning
This article deals with a subject of great importance to get an adequate stability in piano tuning. In principle, to clarify questions on this subject. And it is necessary to explain what are the friction points through which the piano string passes.
Friction points of a piano string
The place where the peg has made at least three spirals is where every piano string is born. It then passes through its first point of friction which may be an agrafe or a v-bar, depending on the design of the piano. This means that if the rope comes in linear form. The point of friction pushes it upwards in such a way that crossing this point is not something that the rope can do. Each point of friction generates a counterforce on the rope.
Capo D’astro Piano bar
Then a first point of friction is the bar in v, then (in the pianos that have bar capo d’astro, as it is in the pianos of tail). We find another point of friction that will brake the tensions of the rope. Then we find the primary useful length to reach the tonal bridge which is the second or third point of friction (depending on the piano). And then we can have on some pianos a v bar more or with. For example, Steinway grand pianos is another small v bar well behind, which is even movable, and allows you to fine tune secondary useful lengths.
It anchors at the end of the rope. And there we find the nail of the plate that is not a point of friction. It is important to note that the bending point is also not a point of friction (in the event that the rope hits the nail. And forms part of another rope) because how it attaches the rope to the nail of the plate prevents movement in that area.
Importance Of Friction Points
For stability in tuning, we check all the friction points through which the string passes. Is of the utmost importance since we tune the piano only from the peg. The piano tuners, when tuning, place the tuning key on the peg and turn it. It is according to this turn that varies the strings tension and therefore its tuning.
The problem that appears when tuning is that the tension added or removed to concentrate the string closer to the peg. That is to say, if we increase the tension on a rope. We find that in the section that goes from the pin to the first point of friction we will have a great amount of tension. This will be smaller in the section that goes from the first point of friction to the second and much smaller between the second and the third point of friction.
The tension along the string is bad. It’s crowded near the peg and the tension has not reached the end of the string.
This may seem to have no inconvenience, however when someone plays that instrument. The percussion of the hammers on the piano strings will cause it to equalize the tensions in the different sectors of the string between the friction points. This will cause the frequencies to change, which is nothing more than an out of tune of the string in question.
If what we did when tensioning the string was to tune it right. But it not distributed the tension along its friction points. What will happen is that when someone plays the piano, it will equalize the tensions, and that will translate into detuning.
Instability In Piano Tuning
As you can see this generates a problem of stability in the tuning and is one of the most serious problems. And more common in those technicians or piano tuners who do not have adequate training. Because they do not know, or do not apply correct, the techniques to equalize the tension.
In the tuning courses offered by the Escuela de Tecnología Pianística de Buenos Aires (Buenos Aires School of Piano Technology). They teach students all the techniques so they can equalize the tuning they perform in such a way as to achieve maximum stability in the tuning.
To achieve a stable piano tuning, from the point of view of the tension. Along the length between all the points of friction of the string, the percussion of the hammers, i.e. playing the keys, it uses the percussion of the hammers, i.e. playing the keysa means. For this there are two types of keystrokes the tuning stroke and the listening stroke.
– Tuning keystroke
– Listen keystroke
The Keystroke Of Tuning
The tuning stroke, because of its intensity, duration and the way they perform it achieves the equalization of the tension of the string. Along its entire length making all parts separated by friction points have the same tension. This means that if we apply the tuning stroke technique, the stability of the tuning achieved will be great.
The Keystroke Of Listening
It opposes the listening keystroke to the tuning keystroke because it is a different stroke. That involves different characteristics and allows us to make a precise and rich listening of the tuning we have achieved.
It is the combination with a good technique of the hits of tuning. Together with the hits of listening that will offer us a tuning of high precision. This is because through the listening stroke it is awakening the best sonorous characteristics of the string. They can then test which.
The tuning stroke ensures that once we have achieved the desired tuning. The distribution of tensions on the string achieves the best equalization along its entire length. Moving through its friction points so that the tuning achieved on that string is maximally sustainable over time and thus achieves quality stability.