Il blog SJX analizza in dettaglio le scelte tecniche ed i risultati delle performance di vari movimenti per orologi da polso.
Previously, in Part I of this series, we analysed and reviewed over 40 watch movements in terms of their potential chronometric performance – via the Horological Density Factor (HDF), which encompasses balance power and power reserve against the size of the movement – and debated the various trade-offs that had been made in order to achieve specific technical or aesthetic characteristics.
Many readers then asked how more commonly known and accessible movements compare. To answer that we needed more data from the industry. Fortunately, Swiss movement makers Valjoux, Fabrique d’Horlogerie de Fontainemelon, Unitas, as well as their parent company Ebauches SA – now all part of ETA – once published beautifully comprehensive, detailed data sheets that included balance wheel inertia values.
Armed with this data, we have been able to analyse and plot a further 25 movements alongside the previous group (with the disclaimer that it might not be fully up to date since the data sheets date from before the Quartz Crisis in the 1970s) to give a total of 68 to allow further investigation and review.
Immagine da Libreshot