Piano technology

What differentiates the various mechanisms?

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francescochopin90

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Opening post by francescochopin90

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What is the difference between a Renner action, a Yamaha one, or a Schwenker? Obviously, I am not talking about geometries, which depend on the design of the individual manufacturer; and I am excluding carbon fiber actions (Millenium III and WNG).

Fundamentally, they all work more or less the same way.

And yet, for example, a Renner is considered synonymous with prestige and quality. So, how does it differ from an inferior one?

I take it for granted that the result is given by the good "placement" of the action, the hammers, the correct friction values, and proper regulation, rather than the brand of the action itself.

What kind of wood are the various levers made of?

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Reply 2 by pianoexpert

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Watch my video tutorial made in the garden..... I present many types of jacks and wippens. Almost all identical in their function. Perhaps some jacks differ in the spring and not all wippens have the same distance from pivot to roller center and the same roller diameter (it also depends on the width of the repetition lever). Woods: generally hornbeam and maple.

In the vertical, walnut sometimes differs; the key levers can be made of hornbeam, maple, or mahogany.

In short, essentially all mechanics are equal. The movement geometries are designed by the Manufacturer.

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Reply 3 by francescochopin90

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pianoexpert wrote:

On 4/2/2023 at 21:56, pianoexpert said:

Watch my video tutorial made in the garden..... I present many types of repetitions (cavalletti) and styli (stiletti). Almost all are identical in their function. Perhaps some repetitions differ in the spring and not all styli have the same distance from pin to roller center or the same roller diameter (it also depends on the width of the repetition lever). Woods: generally hornbeam and maple.

In the vertical, walnut sometimes differs; the repetition sticks can be made of hornbeam, maple, or mahogany.

In short, essentially all mechanisms are equal. The movement geometries are designed by the Manufacturer.

So it seems to me I understand that the real difference is made by the type of repetition and the types of levers, not whether these are produced by "x" rather than by "y".

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Reply 4 by pianoexpert

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Of course. The differences emerge mostly when comparing European productions with American ones. But always minimal

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