Grand Regulation Flashcards
What is the purpose of traveling and burning in piano regulation?
To correct sideways movement and ensure hammers are evenly spaced and oriented for a consistent hammer strike.
This process addresses issues caused by improper drilling and wood twisting due to humidity changes.
What materials are needed for the traveling and burning process?
You will need:
* A thin, 12” to 16” smooth dowel or metal rod
* Traveling paper or traveling tape
* Phillips or flat-head screwdriver
* Embossing heat gun or similar smokeless heat source
The choice of screwdriver depends on the specific piano.
Fill in the blank: Traveling and burning helps technicians correct issues so that the hammers can be _______.
[evenly spaced and oriented]
What can cause twisted shanks in piano hammers?
Humidity changes can cause the wood of the shanks to twist.
This twisting affects the orientation of the hammers.
What is the ideal orientation of hammers on the shanks?
Hammers should be oriented at the proper angle on the ends of the shanks.
This ensures a consistent hammer strike.
Where are the glide bolt adjusting posts located?
Along the balance rail.
How many glide bolt adjusting posts are there typically?
Usually five or six.
What shape are glide bolt adjusting posts commonly similar to?
Tuning pin heads.
What is the first step to test if the keyframe is properly bedded?
Knock on the keys at the balance rail with the thick part of your palm.
What does it mean if there is no knocking sound during the test?
It is a good sign, indicating that we can move on to the second part of the test.
What should you do during the second knock test?
Use two or three fingers on the let-off rail to gently lift the action while knocking.
What should you do if you find two or more bolts that need adjusting?
It’s a good idea to reset all of them.
What is the first action to take if bedding work is required at the balance rail?
Turn all the bolts up by at least a full 360-degree rotation.
What direction should the bolt be turned when adjusting the tuning lever?
Clockwise
What should you do as you turn the bolt down?
Knock on the keys near that bolt
What should you do when you start to hear a knock while turning the bolt?
Continue to turn the bolt down very slowly past this knocking point just until the knock disappears
What should you do after setting the glide bolt at the break between bass and tenor strings?
Move on to the next one, working your way up to the treble end
How do you adjust the end bolts?
Use your hands to knock on the balance rail next to the nearest glide bolt you have already set
What should happen if none of the bolts knock at rest?
They should begin to knock while the stack is slightly lifted
What is the first step in setting the key height?
Take a stack of thick cardboard front rail punchings and set one of the end keys to a height of between 17mm and 21mm from the lip of the key to the top of the key slip.
What should you do if the key exceeds the top of the key slip when set to 21mm?
You will need to lower the key down.
What is the desired outcome when setting the key height?
The key should look good compared to the key slip and have plenty of room between the keytop and the fallboard.
How do you set the height of the opposite end key?
Measure the distance from the key bed to the underside of the keytop with a millimeter ruler and set the height of the opposite end key to that measurement.
What should you do if the height of the opposite end key does not work well compared to the case parts?
Make adjustments to both keys until they each work well at the same measurement compared to the case parts.
