Cu Ng The Keybed Slot - QRS Music Technologies QRS PNO3 Installation Manual

Installa on Procedure
Cu ng the Keybed Slot...
Tools needed for this chapter include a circular saw (sabre saw with a sufficiently long blade/ router may be used), a
power drill with a sharp 1‐3/4" Forstner bit (or wood boring bit), various screwdrivers, a frame square, a pencil, a tape
measure, and paint that matches the underside of the piano.
At this point the piano is on its legs, the ac on is outside of the piano case and has been modified to allow the key tails
to protrude over the rear of the key frame by 1‐1/4". Felts are a ached to the undersides of each key tail, and the
original trapwork is s ll in place.
Next, have an assistant press the sustain pedal. While he depresses it, measure the distance the pedal lyre li rod
moves and write it down. Likewise, measure the distance the damper li rail rises when the pedal is pressed. This
measurement can be taken from inside the case. Next, mark the exact loca on of the upward extension of the pedal
lyre's ver cal rods onto the keybed bo om. Set these measurements aside for later trapwork installa on.
Repeat the above step with the Sostenuto pedal (if it exists).
There may be two or more ac on stop blocks inside the case. These blocks stop the inser on of the grand piano key‐
board at the proper loca on and prevent it from li ing up off the keybed. In the event that these interfere with the
slot to be cut, remove by force applied by a sharp chisel and hammer.
Remove the lyre from the piano.
Turn the piano on its flat or bass side and secure it. Make a visible pencil mark outlining the bass and the treble legs.
Next, remove each leg marking them accordingly (bass, treble, tail) and place in a safe area to prevent damage.
Use a pencil and mark the lyre rod strike points (where the lyre rods hit the original trap work) on the bo om of the
keybed. Remove all trapwork, and other parts that may interfere with the keybed modifica ons from the underside of
the piano.
Using a tape measure, record the distance from the front of the piano case to the marks you previously made inside
the case. Do this on both the bass and treble end. Call this the depth measurement.
Transfer the slot marks made on the inside of the piano case to the underside of the keybed.
For Upright installations, See Page 9.
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