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Member
Member
Dear pianoexpert, since you are our technological beacon, I will take the opportunity to open a discussion regarding the location of the lead weights which, in grand piano keys, are positioned in the front part of the keys, while in upright piano keys, they are located in the back part of the keys??
At least that is what it seems I have seen in some drawings and in some videos on YT.
THANK YOU
regards
saverio
Moderator
It's true. But not always. Generally, in upright pianos, weights are almost never present. They are only where they are needed to equalize the downward weight. In a grand piano, however, everything happens by gravity and the hammer with its capstan plays an important role for the downward weight. Consider that about one extra gram on the hammer translates to about 6 grams on the key. On a grand, the sum of the levers is quite heavy. In the bass, you start with three or four weights and end with very few in the treble. Sometimes on the last two keys, there is a small weight beyond the fulcrum.
In short, it is the Manufacturer that establishes the balances, the amount of regulation weights, and therefore the inertia.
In case of replacement of hammers or other components, the weights must be kept identical to the original ones.
Paolo
