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Piano Technician Course > Upright Regulation > Flashcards

Upright Regulation Flashcards

1
Q

What 3 parts of the key contact affect key operation

A
  1. Balance rail bushing
  2. Front rail bushing
    3 balance rail hole
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2
Q

If the bushings are too tight or too loose what happens

A

Tight: sticky keys, repetition problems
Loose: keys sloppy and may click

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3
Q

What is the main function of the bridle strap

A

Hold up the wippens so the jack remains in place under the butt of the hammer

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4
Q

If bridle strap wire is too far forward what happens?

A

Jack not under butt properly and hammer could block against strings

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5
Q

If bridle strap wire is too far back what happens?

A

The jack will have a hard time resetting under the butt and keys will dip when soft pedal is on

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6
Q

To space keys what pin gets moved

A

The front rail pin( under the felt cushion) gets shifted left or right with a key spacing tool

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7
Q

If a key is not level what pin gets moved

A

The balance rail pin can be gently moved by placing a screwdriver on the pin and tapping with a hammer

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8
Q

What are the 3 main adjustments that affect aftertouch

A

Let off
Hammer blow distance
Key dip

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9
Q

How does let off affect after touch

A

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)

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10
Q

When the hammer is ———- to the string at rest there will be more aftertouch

A

Closer : less space to travel for hammer means more key movement after sound

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11
Q

Adding punchings beneath the front rail will ———aftertouch

A

Decrease. ( less key dip less aftertouch)

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12
Q

What is lost motion in an upright piano?

A

Lost motion refers to the play or gap in the action mechanism of the piano keys before they engage the hammer.

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13
Q

Fill in the blank: Lost motion can affect the __________ of a piano.

A

responsiveness

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14
Q

What is the primary cause of lost motion in an upright piano?

A

Wear and tear in the action components over time.

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15
Q

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

A

C) Tuning Peg

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16
Q

How can lost motion be measured in an upright piano?

A

By observing the distance a key travels before the hammer begins to move.

17
Q

True or False: Lost motion can be adjusted or reduced.

A

True

18
Q

What is the effect of excessive lost motion on piano performance?

A

It can lead to a sluggish response and decreased control for the pianist.

19
Q

Multiple Choice: Which part of the piano action is most commonly associated with lost motion? A) Damper B) Key Bed C) Hammer D) Pedal

A

C) Hammer

20
Q

What is the relationship between lost motion and the touch sensitivity of a piano?

A

Increased lost motion can decrease touch sensitivity, making it harder to control dynamics.

21
Q

True or False: All pianos have some level of lost motion.

A

True

22
Q

What can a technician do to correct lost motion?

A

They can adjust the action components to reduce the gap between the key movement and hammer engagement.

23
Q

Fill in the blank: Lost motion can be more pronounced in __________ pianos due to their construction.

A

older

24
Q

How does humidity affect lost motion in an upright piano?

A

Humidity can cause parts to swell or shrink, potentially increasing lost motion.

25
Q

What is one sign that a piano may have excessive lost motion?

A

The keys feel unresponsive or require more force to play than normal.

26
Q

Fill in the blank: A well-regulated piano should have __________ lost motion.

A

minimal

27
Q

Distance between hammer and string while hammer is in check should be ——mm

A

15-16mm

28
Q

Bending the damper spoon towards the strings make the damper lift———(sooner or later) in the key stroke

A

Sooner

29
Q

Describe what capstan adjustment does

A

Raising it makes wippen higher which leads to jack hitting hammer sooner
This means LESS lost motion

30
Q

What if there is TOO MUCH aftertouch

A

Less control
Loss of power
Repetition limited

31
Q

What is one definition of aftertouch

A

The distance the key moves after the hammer has let off

32
Q

Sooner letoff equals?

A

More aftertouch

33
Q

Less hammer blow distance equals——— aftertouch

A

More

34
Q

More key dip equals——aftertouch

A

More

35
Q

How far away from string should hammer let off

A

2mm

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