Upright Regulation Flashcards
What 3 parts of the key contact affect key operation
- Balance rail bushing
- Front rail bushing
3 balance rail hole
If the bushings are too tight or too loose what happens
Tight: sticky keys, repetition problems
Loose: keys sloppy and may click
What is the main function of the bridle strap
Hold up the wippens so the jack remains in place under the butt of the hammer
If bridle strap wire is too far forward what happens?
Jack not under butt properly and hammer could block against strings
If bridle strap wire is too far back what happens?
The jack will have a hard time resetting under the butt and keys will dip when soft pedal is on
To space keys what pin gets moved
The front rail pin( under the felt cushion) gets shifted left or right with a key spacing tool
If a key is not level what pin gets moved
The balance rail pin can be gently moved by placing a screwdriver on the pin and tapping with a hammer
What are the 3 main adjustments that affect aftertouch
Let off
Hammer blow distance
Key dip
How does let off affect after touch
If the jack trips out from the butt when the hammer is farther from the sting there will be more aftertouch( let off earlier in the keystroke)
earlier let off =more after touch
When the hammer is ———- to the string at rest there will be more aftertouch
Closer : less space to travel for hammer means more key movement after sound
Adding punchings beneath the front rail will ———aftertouch
Decrease. ( less key dip less aftertouch)
What is lost motion in an upright piano?
Lost motion refers to the play or gap in the action mechanism of the piano keys before they engage the hammer.
Fill in the blank: Lost motion can affect the __________ of a piano.
responsiveness
What is the primary cause of lost motion in an upright piano?
Wear and tear in the action components over time.
Multiple Choice: Which of the following is NOT a component that can contribute to lost motion? A) Key B) Hammer C) Tuning Peg D) Action Rail
C) Tuning Peg
How can lost motion be measured in an upright piano?
By observing the distance a key travels before the hammer begins to move.
True or False: Lost motion can be adjusted or reduced.
True
What is the effect of excessive lost motion on piano performance?
It can lead to a sluggish response and decreased control for the pianist.
Multiple Choice: Which part of the piano action is most commonly associated with lost motion? A) Damper B) Key Bed C) Hammer D) Pedal
C) Hammer
What is the relationship between lost motion and the touch sensitivity of a piano?
Increased lost motion can decrease touch sensitivity, making it harder to control dynamics.
True or False: All pianos have some level of lost motion.
True
What can a technician do to correct lost motion?
They can adjust the action components to reduce the gap between the key movement and hammer engagement.
Fill in the blank: Lost motion can be more pronounced in __________ pianos due to their construction.
older
How does humidity affect lost motion in an upright piano?
Humidity can cause parts to swell or shrink, potentially increasing lost motion.
