Piano Technology

[ojkojbgoj]

Hello all,

I'm trying to figure out somethings concerning piano regulation and had a few questions. If you have any experience in the matter and can shed some light i'd greatly appreciate it.
Cheers!

1) Which function happens first in the key stroke: letoff or drop?

2) What are the maximum and minimum distances for letoff?

3) What part of the wippen touches the drop screw?

4) When rough setting letoff, how close should the hammer be to the string when the tender touches the letoff button?

5) When you want to raise the rep lever cushion in relation to the drop screw, which way do you turn the rep lever screw, clockwise or counterclockwise?

6) How do you avoid “bunching the repetition lever punching”?

7) Name the three regulation adjustments that are connected to the wippen.

In order to get a clear view of the spring tension when the hammer rises after impact, what regulation adjustment must be rough set before you start adjusting the springs?

[birba]

God, am I ignorant...

[pianolive]

https://www.bochinsky.de/product_info.php/products_id/361/cPath/29/klavier/die-regulierung-von-piano--und-fluegelmechaniken.html

[pianowolfi]

God, am I ignorant...

Me too  . But I have an advantage . I have a good friend whom I can ask about such things if it's necessary. We can't do everything. We have to practice, teach, play. I admire your pianism!

[lhorwinkle]

Read the Reblitz book:
"Piano Servicing, Tuning, and Rebuilding: For the Professional, the Student, and the Hobbyist"
https://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=reblitz&x=0&y=0

[willvenables]

Sounds like a tech exam - or are you in a pub quiz with a piano tech convention???

My answers are below...

Hello all,

I'm trying to figure out somethings concerning piano regulation and had a few questions. If you have any experience in the matter and can shed some light i'd greatly appreciate it.
Cheers!

1) Which function happens first in the key stroke: letoff or drop?

Let off should be first/same time depending on... The drop is regulated by adjusting the repetition lever screw on the hammer flange to determine the height of the repetition lever when the key returns to repeat, so the jack can get back underneath the roller by enough to allow repetition. The hammer should be raised by the repetition lever to 5mm from strings and this measurement is known as the 'drop'. The geometry of the action should be that the let off happens a fraction before the lever touches the screw.

2) What are the maximum and minimum distances for letoff?

Bass 4-3mm, tenor 3-2, treble 2-1.5

3) What part of the wippen touches the drop screw?

repetition lever

4) When rough setting letoff, how close should the hammer be to the string when the tender touches the letoff button?

see answer to Q2

5) When you want to raise the rep lever cushion in relation to the drop screw, which way do you turn the rep lever screw, clockwise or counterclockwise?

counterclockwise

6) How do you avoid “bunching the repetition lever punching”?

haven't heard of "bunching"

7) Name the three regulation adjustments that are connected to the wippen.

1: jack height 2: jack position 3: lever spring tension

In order to get a clear view of the spring tension when the hammer rises after impact, what regulation adjustment must be rough set before you start adjusting the springs?

jack height, jack position, letoff, check, drop... also the hammer flange centre checked for being overtight or too loose.