RM 020 POCKET WATCH TOURBILLON 520.45.91

TECHNICAL SPECIFICATIONS OF THE RICHARD MILLE TOURBILLON POCKET WATCH RM 020

CALIBER RM 020: manual winding tourbillon movement with hours, minutes, power reserve and function indicator.

Dimensions: length 62 mm x 52.00 mm (widest point) x 15.60 mm (thickest area).

MAIN FEATURES
(MANY OF WHICH ARE MAJOR TECHNICAL INNOVATIONS)

CARBON NANOFIBER BASEPLATE
This is an isotropic composite material created from carbon nanofibers molded under a high pressure of 7,500 N/cm2 and a temperature of 2,000ÿ¿C, resulting in a material with high mechanical, physical and chemical stability in all directions. The ribbed perimeter of the movement plate assures the highest rigidity between the plate and bridges. Carbon nanofiber 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 ranges. This stability assures the highest integrity of the movement’s going train under all conditions.

POWER RESERVE:
circa 10 days, supplied by two directly engaged winding barrels, visible via a
numeric sale located between 9 and 10 o’clock.

VARIABLE INERTIA, FREE SPRUNG BALANCE
The free-sprung balance with overcoil spring (originally designed for pocket watches in particular), gives better reliability in the event of shocks, movement assembly and disassembly, and also guarantees excellent chronometric results over an extended period of time.

BARREL PAWL WITH PROGRESSIVE RECOIL
This device permits an appreciable winding gain (circa 20 %), especially during the start of winding. It also aids in the even distribution of the mainspring’s internal tension.

FUNCTION INDICATOR
In a manner similar to a car’s gearbox, the function indicator allows one to see the winding, neutral and hand setting positions as the crown is pulled out. Each position is indicated via a hand at 4 o’clock displaying the following functions: W(Winding) – N(Neutral) – H(Hands).

MODULAR TIME SETTING MECHANISM FITTED AGAINST THE CASE BACK
Provides the following advantages for longevity and maintenance:
• Since the component is mounted outside of the movement, the time setting assembly can be
changed without affecting the integrity of the bottom plate in the event of a possible defect or
during maintenance
• The mounting and dismantling of this module from the back will not require the removal of the
hands and the dial

TORQUE LIMITING CROWN
The RM 020 crown is an exceptional component part. It was manufactured by the company Cheval freres who have been in the business of specialist component watch parts for 160 years and proved to be a real challenge in technique. 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 in the stand). This added security system prevents accidental overwinding of the watch, the result of which can cause damage such as breaking the winding stem or putting too much pressure on the barrel spring.

WHEEL BASED TIME SETTING SYSTEM
Provides smooth time setting functions through the elimination of engaging friction by replacing it with rolling friction.

ZIRCON ENDSTONES FOR THE TOURBILLON CAGE
This reflects a technical and long-term view towards the elimination of wear phenomena, resulting in improved technical tribology.

CENTRAL BRIDGE IN RIGIDIFIED ARCAP
The ribs ensure better rigidity for the bottom plate/bridge assembly.

SPLINE SCREWS IN GRADE 5 TITANIUM FOR THE BRIDGES AND CASE
This permits better control of the torque applied to the screws during assembly. These screws are therefore unaffected by physical manipulation during assembly or disassembly and age well.

WINDING BARREL TEETH AND THIRD-WHEEL PINION WITH CENTRAL INVOLUTE PROFILE
The central involute profile of the winding barrel teeth and pinion provides an optimal pressure angle of 20°. This promotes effective rotary motion and allows for compensation of possible variations in the engagement of the going train, thus insuring excellent torque transmission with a distinct improvement in performance.

CASE
Central caseband in titanium (all versions), with both front and back bezels in either 18ct red gold, white gold or titanium.

OTHER FEATURES
• Movement dimensions: 42.20 x 42.20 mm
• Thickness: 8.40 mm
• Tourbillon diameter: 12.30 mm
• Balance wheel diameter: 9.12 mm
• Number of jewels: 28
• Balance: GLUCYDUR, 2 arms, 4 setting screws, inertia moment 10 mg.cm2, angle of lift 53º
• Frequency: 21,600 vph (3 Hz)
• Balance spring: ELINVAR by NIVAROX
• Shock protection: KIF ELASTOR KE 160 B28
• Stone setting in white gold
• Barrel shaft in nickel-free chronifer (DIN x 46 Cr 13 + S) with the following characteristics:
• stainless- antimagnetic- suitable for tempering

FINISHING

MOVEMENT
• Anglage and polishing by hand
• Locking sections hand polished
• Sapphire blasted milled sections
• Lapped and polished contact points
• Burnished pivots

STEEL PARTS
• Sapphire blasted surfaces
• Anglage and polishing by hand

GEAR WHEELS
• Concave chamfering with a diamond tool
• Circular finished faces
• Gilded (before cutting the teeth)
• Minimum correction applied to the wheels in order to preserve geometry and performance