Started by
Member
Member
Hello everyone!
I noticed that my Schulze Pollmann 1/4 grand piano has a small problem!
Many of the treble keys (right side of the keyboard) make noise when they are released! I removed the fallboard and the defect does not manifest itself!
I checked with a level and noticed a slight (about 8 mm) unlevel position of the instrument. The left side is a bit lower.
What do you advise me to do or check?
Thank you
Lorenzo
Moderator
the so-called "key thud" can depend on many things. Regulation, hammer rest felt too hard, springs too heavily loaded, repetition levers too low compared to escapement levers, hardness of the rollers ... etc.... it is not a matter of "leveling"
Member
Excuse me Paolo, but it's not a mechanical noise! You can really hear a "Tac" when the key is released. It's actually right under the fallboard; if I remove or lift it, it can no longer be heard! Furthermore, putting my eyes at the level of the keys with the fallboard raised, you notice that its edge on the right is a few millimeters lower! I also thought about wear and tear of the hardware, but I have my doubts!
As soon as I fix my PC, I'll post some photos!
Hi Paolo and thanks!
Lorenzo
Member
Hello Lorenzo, I had the same problem, now resolved with Maestro Paolo's advice.
It is a matter of excessive play between the key hole and the pin.
Regards, Sergio.
Member
Thanks for the interest!
Let's see if anything can be understood from the photo!
A bit of noise in the keys is present, but the annoying one is due to the impact against the fallboard. Lifting it slightly, the noise disappears.
The right part of the raised fallboard (I don't know if it's visible) is a few mm lower, using the crossbar behind as a reference point!
Thanks,
Moderator
it could be that the key dip is too low and the key return makes noise. There must be one or two mm of play between the key dip and the keys. Maybe that's it?
Member
I really think so! Before doing a bit of hand planing on the area concerned, I need to find a way to precisely mark the points where the keys touch the keybed! Naturally, I want to rule out any other possible problems... 90% it's this!
There are no strange movements in the keys!
I will see to resolving the problem calmly!
Thanks everyone!
Lorenzo
Member
I forgot: the light between the keys and the fallboard is uniform across the entire extent of the keyboard, and the hardware shows no signs of wear!
Member
My intervention was made on the key because the lip was perfectly parallel to the keyboard.
The "planing" seems excessive and irreversible to me.
Member
Sergio wrote:
My intervention was done on the key because the key lever was perfectly parallel to the keyboard.
The "planing" seems excessive and irreversible to me.
In what way did you act on the key?
In the end, I think the key lever is just a piece of wood! Currently, I take it apart when I play so I don't hear the clicking sounds 🙄 :rolleyes: 🙄
I think a little touch-up even with a well-sharpened chisel could solve everything! If you didn't fix the key lever, it would always remain as it is because the point to be touched up is not visible! 😉 ;) 😮
Thank you
Lorenzo
Member
I replaced the pin felt under the key (if the play is still excessive, it must also be done on the center pivot).
Intervening "downstream" of the problem does not appeal to me.
In any case, ask someone more experienced than me before acting on the pf and always use great caution.
Regards, Sergio.
Member
Forgive me Sergio, but did you replace the mortise bushing? But doesn't this affect the lateral play of the key? I can't understand!
Did you have the exact same problem?
Thank you
Member
Yes, the problem is identical; I replaced the felt that edges the wooden flange to increase friction with the through metal pin (I don't know what it's called).
See lesson no. 3 (journey inside the piano)
Let me know.
