Shock protection such as Kif or Incabloc is ubiquitous in modern calibres, and serves to protect the delicate balance staff, which must be thin to reduce friction, yet support the weight of the entire balance wheel. Why stop there, though? The entire movement can be protected, and there are various ways to do this.
A movement can only receive shocks through its case, so isolating the two from each other is a very viable method. Richard Mille does this in the RM 27-01 Tourbillon Rafael Nadal by suspending the movement with four braided steel cables, each just 0.35mm thick, and using a system of pulleys and tensioners to adjust their tautness. The brand claims that the watch has a shock resistance of 5,000G – enough to survive a tennis match on Nadal’s wrist.
Instead of minimising the contact between the movement and its case, Franck Muller took things to the other extreme with the Vanguard Backswing, its golf-themed timepiece. The watch has a relatively small movement just 26.2mm across, which is fitted into a case measuring 44mm by 53.7mm; a wide spacer ring containing silicone inserts takes up the rest of the inner case and cushions the movement from shocks and vibrations.
When Casio started developing G-shocks with metal cases, it had to re-examine the issue of shock resistance, since the protection afforded by the original shock absorbing resin case was no longer available. The solution to circumvent this has evolved over the years, and the latest involves the judicious application of a high-tech material called Alpha Gel. This silicone-based substance is sourced from Taica Corporation, a Japanese R&D firm, and contains extraordinary shock absorption properties – a layer of Alpha Gel barely an inch thick can cushion a one-metre fall of an egg and keep it from breaking. By designing the movement and case to be in contact only at specific points, and “reinforcing” these points with Alpha Gel, the movement is effectively protected against shocks and vibrations.
|| THE VERDICT ||
Suspending a movement with tensioned cables or floating it within a wide spacer ring are both effective solutions to creating a shock resistant watch. The main drawback, however, is the volume of space needed within the case to implement them. Alpha Gel thus emerges as a preferred option as it requires less internal space, which allows a larger movement to be used.
The MRG-G1000HT uses Alpha Gel for shock protection, like other metal-clad G-shocks
Steel cables suspend the movement inside the Richard Mille RM 27-01