PIANO TUNING
Many factors cause pianos to go out of tune, particularly atmospheric changes. For instance, changes in humidity will affect the pitch of a piano; high humidity causes the sound board to swell, stretching the strings and causing the pitch to go sharp, while low humidity has the opposite effect. Changes in temperature can also affect the overall pitch of a piano. In newer pianos the strings gradually stretch and wooden parts compress, causing the piano to go flat, while in older pianos the tuning pins (that hold the strings in tune) can become loose and don't hold the piano in tune as well. Frequent and hard playing can also cause a piano to go out of tune.
For these reasons many piano manufacturers recommend that new pianos be tuned four times during the first year and twice a year thereafter.
Many factors cause pianos to go out of tune, particularly atmospheric changes. For instance, changes in humidity will affect the pitch of a piano; high humidity causes the sound board to swell, stretching the strings and causing the pitch to go sharp, while low humidity has the opposite effect. Changes in temperature can also affect the overall pitch of a piano. In newer pianos the strings gradually stretch and wooden parts compress, causing the piano to go flat, while in older pianos the tuning pins (that hold the strings in tune) can become loose and don't hold the piano in tune as well. Frequent and hard playing can also cause a piano to go out of tune.
For these reasons many piano manufacturers recommend that new pianos be tuned four times during the first year and twice a year thereafter.
MOVING A PIANO
Moving a piano is a complicated process. There is risk to the piano, risk of bodily injury to the person moving the piano and other people and risk of damage to other property. Although moving a piano may seem like a simple procedure, hidden factors compound the task. Pianos are difficult to move and should only be moved by a professional who is careful, properly trained, insured, and has the proper equipment.
An upright piano is the most popular and easier to move than a grand piano. It is moved by lifting the piano and sliding a piano movers' dolly underneath or lifting the piano up onto the dolly. The dolly has a strong frame for moving and large rubber wheels for ease of moving and not scratching the floor. The piano is transported to its new location and removed from the dolly. The piano should be covered to prevent being scratched or damaged.
The wheels attached to the vertical piano itself are rarely used for moving, and are primarily designed for cosmetic effects. For a studio piano with larger, double wheels, it is designed only for short moves. When moving a studio piano beyond the immediate room or for more than just a few feet, a dolly should still be used.
Moving a piano is a complicated process. There is risk to the piano, risk of bodily injury to the person moving the piano and other people and risk of damage to other property. Although moving a piano may seem like a simple procedure, hidden factors compound the task. Pianos are difficult to move and should only be moved by a professional who is careful, properly trained, insured, and has the proper equipment.
An upright piano is the most popular and easier to move than a grand piano. It is moved by lifting the piano and sliding a piano movers' dolly underneath or lifting the piano up onto the dolly. The dolly has a strong frame for moving and large rubber wheels for ease of moving and not scratching the floor. The piano is transported to its new location and removed from the dolly. The piano should be covered to prevent being scratched or damaged.
The wheels attached to the vertical piano itself are rarely used for moving, and are primarily designed for cosmetic effects. For a studio piano with larger, double wheels, it is designed only for short moves. When moving a studio piano beyond the immediate room or for more than just a few feet, a dolly should still be used.
PIANO MAINTENANCE
Voicing
The felt hammers of the piano tend to harden over time, as the felt becomes compressed by repeated impact. They also form grooves at the points of contact with the strings. Harder hammers produce a brighter tone quality, which may ultimately become harsh and undesirable. Piano technicians can soften hammers using special tools called voicing needles. They also sometimes use special hardening agents when the hammers are too soft (though this practice is controversial among some technicians). In either case, an important goal is uniform tone quality across the piano, since the hammers are not used with equal frequency and therefore tend to wear unevenly. How much and how forcefully the piano is played is a factor in how often a piano is voiced, as are the piano's setting and the preferences of its players.
Over time, the strings will wear grooves into the surface of the hammers. The grooves eventually become deep enough, and the head of the hammer flattened enough, that voicing cannot restore the piano's tone. At this point, a technician can file the hammers, restoring their original ovoid shape and pristine surface at the expense of making them somewhat smaller. This process may repeat several times, until there is not enough felt left on the hammers for another filing, and they must be replaced.
Regulation
Over time, the performance of a piano action tends to decline, due to the compression of felt, warping of wood, and other types of wear. A skilled technician can restore it to optimal precision, in a process called regulation, which involves adjustments ranging from turning a small screw to sanding down a wood surface. Many new pianos are not perfectly regulated when released from the factory, or quickly lose their regulation when moved to their new home, and benefit from regulation in the store or in the home.
The goal of regulation is to make the piano's touch and sound consistent across all notes, allow it to comfortably achieve the widest possible range of dynamics, and make the keys responsive to even the most rapid or most subtle motions of the player.
There are many dozens of types of regulation a piano may require. The most important include adjustment of:
Voicing
The felt hammers of the piano tend to harden over time, as the felt becomes compressed by repeated impact. They also form grooves at the points of contact with the strings. Harder hammers produce a brighter tone quality, which may ultimately become harsh and undesirable. Piano technicians can soften hammers using special tools called voicing needles. They also sometimes use special hardening agents when the hammers are too soft (though this practice is controversial among some technicians). In either case, an important goal is uniform tone quality across the piano, since the hammers are not used with equal frequency and therefore tend to wear unevenly. How much and how forcefully the piano is played is a factor in how often a piano is voiced, as are the piano's setting and the preferences of its players.
Over time, the strings will wear grooves into the surface of the hammers. The grooves eventually become deep enough, and the head of the hammer flattened enough, that voicing cannot restore the piano's tone. At this point, a technician can file the hammers, restoring their original ovoid shape and pristine surface at the expense of making them somewhat smaller. This process may repeat several times, until there is not enough felt left on the hammers for another filing, and they must be replaced.
Regulation
Over time, the performance of a piano action tends to decline, due to the compression of felt, warping of wood, and other types of wear. A skilled technician can restore it to optimal precision, in a process called regulation, which involves adjustments ranging from turning a small screw to sanding down a wood surface. Many new pianos are not perfectly regulated when released from the factory, or quickly lose their regulation when moved to their new home, and benefit from regulation in the store or in the home.
The goal of regulation is to make the piano's touch and sound consistent across all notes, allow it to comfortably achieve the widest possible range of dynamics, and make the keys responsive to even the most rapid or most subtle motions of the player.
There are many dozens of types of regulation a piano may require. The most important include adjustment of:
-
- Let-off, the point when the hammer disengages from the jack and flies freely. If the let-off is too large, it can be very difficult to achieve a pianissimo, to execute rapid trills, and to play powerful fortes; if too
small, notes can acquire a "pinched" sound, or even block. - Drop, how far the hammers fall back after let-off. This affects the responsiveness of the action.
- Repetition springs in a grand piano, which allow a hammer to repeatedly strike with minimal lifting of a key. If a spring is too springy, it can cause double-strikes; if not springy enough, it becomes difficult to repeat a note.
- Key weights (and, in some actions, weight-regulating springs) control the inertia of the keys. A technician can add, remove, or change lead weights in the keys to change how light or heavy the keys feel to the
player.
- Let-off, the point when the hammer disengages from the jack and flies freely. If the let-off is too large, it can be very difficult to achieve a pianissimo, to execute rapid trills, and to play powerful fortes; if too