Grand Piano Wippen Guide
Features of the Renner Wippen
On fine quality pianos, this amazing action mechanism, perfected over 300 years, is made from all natural living material like fine woods, felt, and leather which depend on small action centers to precisely control their motion with specific tolerances that must also move naturally within the environment.
1. Fine Adjustment Screws
Designed for superior fine adjustments after initial rough regulations. Also prevents butterfly spring from wearing a noisy groove in the repetition lever.
2. Regulating Screws
Renner wippens feature a precision machined regulation screw with graduated tension for optimum regulation.
3. The Butterfly Spring
Engineered and hand adjusted at the factory for maximum strength and precision in order to ensure the most finely tuned and durable regulation possible. *see additional info below
4. Action Center
Over the average lifetime of a piano, the piano keys may be played millions of times, activating the hundreds of small levers which transmit the energy from the finger of the performer to the hammerhead which strikes the strings, producing the sound you hear.
5. The Renner Spoon
Unique design includes a large, easily adjusted surface with adjustment arm ribbed at the base and deeply inset for maximum regulation precision and durability.
6. Universal Wippen
The flexibility of this unique design allows accurate replacement of piano actions for those very special pianos no longer in production and for which replacement parts are not available.
7. High Definition Flange
The High Definition Flange will provide a more accurate flange seating on the many different flange rails produced over the years for both vintage and modern pianos, providing a more accurate transmission of power from the key to the string.
8. Hornbeam Wood
One of the little know secrets of Renner action parts is the use of a special wood called Weissbuche – Hornbeam in English – which is naturally air-dried and aged over several years.
* Renner wippens have three butterfly spring diameters in each set to accommodate the decrease in hammer weight from bass to treble. In order to preserve the proper progression of spring sizes, the wippens must be kept in order when removed from the box. Only the first and last wippen from each section are numbered. The bass section includes notes 1-40; the middle section notes 41-70; the top section notes 71-88. One extra bass and treble wippen (numbered 89) are also included.
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