TIME AND INFINITE SPACE
RM 020 TOURBILLON POCKET WATCH
CARBON NANOFIBRE BASEPLATE
This is an isotropic composite material created from carbon nanofibres moulded under pressure of 7,500 N/cm2 at a temperature of 2,000˚C, resulting in a material with high mechanical, physical and chemical stability in all directions. The ribbed perimeter of the movement baseplate ensures the highest rigidity of the baseplate and bridges.
Carbon nanofibre composite structures such as this are amorphous, chemically neutral and dimensionally constant within a very wide range of operating temperatures, including those outside of normal experience. This stability ensures the greatest integrity of the movement’s going train under all conditions.
Movement dimensions: 42.20 x 42.20 mm
Thickness: 8.40 mm
Tourbillon diameter: 12.30 mm
Number of jewels: 28, set in white gold chatons
Balance wheel diameter: 9.12 mm
Balance: Glucydur®, 2 arms, 4 setting screws, moment of inertia 10 mg•cm2, angle of lift 53°
Frequency: 21,600 vph (3 Hz)
Balance spring: elinvar by Nivarox®
Shock protection: KIF Elastor KE 160 B28
Barrel shaft: nickel-free Chronifer® (DIN x 46 Cr 13 + S) with the following characteristics: stainless – antimagnetic – suitable for tempering
TORQUE LIMITING CROWN IN TITANIUM
The RM 020 crown is an exceptional component. It was manufactured by Cheval Frères, who have been in the business of specialist component watch parts for 165 years, and proved to be a real technical challenge. The chain, clasp, crown cover and stand require 580 separate operations, of which 140 are finishing operations and 126 control operations. There are no less than 189 component parts (27 parts in the crown, 20 in the crown cover, 16 in the clasp, 65 in the chain and 61 parts in the separate stand).
The added security of this crown prevents accidental overwinding of the watch, which can cause damage to the winding stem or place excess pressure on the barrel spring.