Closing days 2021

Events :

  • 2 April, Good Friday
  • 5 April, Easter Monday
  • 1st May, Labour Day
  • 13, 14 May, Ascension Day
  • 24 May, Whit Monday
  • 3, 4 June, Corpus Christi
  • 23 June, Commémoration du Plébiscite Jurassien
  • 1st November, All saints day

Summer holidays from July 19 to August 6 2021.
Winter holidays from 2021 December 22 to 2022 January 4



Assembly is a setting operation in which the wheel is placed on the pinion. Flatness, concentricity and the correct axial and radial play are the natural requirements for assembled parts.Great attention must be paid to ensure the sub-assemblies are the correct size and the finish is immaculate as assembly is the final operation. All the successive steps involved in producing the constituent parts of the wheel set have contributed to the finished product. It is therefore during this final operation that any issues in previous operations are resolved, and this presents an initial challenge.The beauty and precision of our wheel sets contribute to the success of the watch movements employed by prestigious brands.


Mirror polishing and brushing are finishing operations carried out on parts: generally, it is the visible surfaces of the movement which are affected by this treatment. Our experts use very accurate tools, polishing paste and repeated rubbing to give parts a mirror-like finish. Whether the part in question is a screw head, a support plate, the end of a pivot or the shoulder, the challenge lies not so much in polishing the part, but in holding it in place: minuscule or special-shaped, it is tapered parts which prove the trickiest to lay flat. Furthermore, after this operation, the immaculate, polished finishes of the surfaces present an additional challenge when it comes to detaching and cleaning the parts.


Along with gilding, this is the most common decoration for high-end wheels. The operation consists of using very special sandpaper to create concentric circles on the surfaces of the wheels. This decoration creates the most beautiful play of light when the watch movement is examined. The reflection of interlaced circles is reminiscent of the nuclear symbol.


A decorative operation which ‘in contrast to the concentric circles created in circular graining’ here consists of creating a snail’s shell pattern on a surface which is generally visible. Snailing is a decorative effect applied to wheels. It is created by applying a grinding wheel or a milling cutter to the surface of the rotating wheel, at a precise angle. The lines are not straight, as in the sunray decoration, but rather curve outwards from the centre of the wheel to create the snail’s shell pattern. Experts in the art of watch decoration combine these effects to create a play of light and accentuate certain parts of the watch.


Verification and metrology are inseparable technical areas.As its name suggests, “verification” consists of checking the dimensional and aesthetic aspects of each part. The process begins with a statistical check on a uniform batch. Most importantly, it involves a final check after each operation.Metrology is the science used to monitor verification equipment. This equipment is delicate and, owing to the precision of the checks, cannot be used without periodic maintenance. Metrology also involves understanding how a dimension is checked. Here again, the difficulty in this art lies mainly in ensuring the part fits correctly.


Thanks to its Citizen CNC machine base covering 1 to 16 mm, Joray & Wyss is able to turn all kinds of precision parts (±2 microns), including even complex parts requiring contouring, cutting, broaching, boring or other milling operations in a range of different materials. Blanks play a strategic role in subsequent operations and Joray & Wyss attaches great importance to the quality of the finishes and centred dimensions.


Cutting uses very accurate tools which enable a plate to be cut out of a strip of laminated material without deforming it. In this way, a press is used to cut out a solid wheel, or a wheel with arms, or to create an opening which will be used to adjust a function in the watch movement.

The tool comprises an assembly of different parts which all slide along each other. The challenge lies in finding the right amount of play: excessive play can lead to off-centring or create burrs, while insufficient play can lead to deformation or create stresses in the material. Given the minute dimensions of these parts, watchmaking truly is a very demanding art.


Sinking is a decorative effect applied to wheels. It consists of milling a sink into the surface of the wheel. This is machined using a diamond-tipped tool. In the light, this decoration creates reflections thanks to the mirror-like finish of the copper-coloured material.


Sinking is a decorative effect applied to wheels. It consists of milling a sink into the surface of the wheel. This is machined using a diamond-tipped tool. In the light, this decoration creates reflections thanks to the mirror-like finish of the copper-coloured material.


Mechanics is a technical science which is both ancient and modern. Since ancient times, humans have sought to find the best solutions to achieve their objectives. It seems to be the art of “System D”. In contrast, at Joray-Wyss, our mechanics show no signs of improvisation; rather they are the fruit of great expertise in producing the precision tools which are essential for creating the parts required by our customers. The field of mechanics impacts all industrial sectors and demands great responsiveness to production requirements.


Like sandblasting, mechanical polishing, (performed in bulk on tonneaus), is a deburring and finishing operation carried out on all areas of the part. Nothing is too good when you are creating a masterpiece.Our parts are first hardened using heat treatment; they are then given the smoothest, shiniest finish possible in a polishing operation that involves various particles, or “carriers”, charged with diamond powder. This polished finish serves to reduce friction and helps to save energy, extending the power reserve.


Although this operation is referred to as “grinding” at Joray-Wyss, it actually involves drilling the central hole in the wheel, which is vital to ensure the wheel rotates perfectly concentrically. At Joray-Wyss, we do not manufacture wheels like many of our competitors; therein lies the secret of our two founders, who found a way to drill the central hole with great precision. Drilling the hole in the centre of the wheel in relation to the teeth which had already been machined made it easier to achieve perfect concentricity, which is vital to ensure the correct operation of the mechanical movement.


Rolling is a finishing operation which consists of grinding the pivots and surfaces of a pinion to facilitate its rotation in the stones (or jewels) on the main plate of the movement in which they are held. In fact, it is essential to minimise friction, as this may prematurely reduce the power reserve on electric quartz watches or mechanical watches. The finishes on the pivots and surfaces of the pinion must be of the highest quality (micron precision) to facilitate the kinematics of the movement. Rolling is a complex operation owing to the nature of the process itself and its automatic loading. It involves carefully rotating millimetre-scale parts, without damaging their micron-sized diameters and polished finishes.


Sand is as hard as diamond and is an excellent vector for polishing surfaces. It is used to treat the stone façades in our magnificent town centres. It is used by metalworkers to strip paintwork. Nothing withstands sand! This is why, at Joray-Wyss, we mainly use sandblasting to smooth surfaces and eliminate machining burrs from hard-to-reach areas, in short, to create a beautiful piece.


The sunray decoration is one of the decorative effects applied to wheels. It is created by applying a grinding wheel or a milling cutter to the surface of the rotating wheel. The lines run straight out from the centre of the wheel creating the most beautiful sunray pattern.


The cutting operation consists of machining teeth into the outside diameter of the turned blank.

This is a complex operation using sophisticated tools, such as machining hobs and blank holders, and requires some thirty parameters to be rigorously controlled to ensure the perfect setup.

The challenges here lie in the dimensions of the parts, loading the parts, and in the requirements concerning the finish (ensuring no machining burrs or damage when loading). As for the wheels, concentricity is a vital element which must be respected.


In contrast to cutting pinions, the simplicity of the wheel-cutting process facilitates the adjustment operations. Each wheel generally features between 30 and 120 teeth. They are mainly cut in bundles using hydraulic clamping with semiautomatic or automatic loading via an oil bath. During this operation, it is important to avoid machining burrs, scratches and friction. Concentricity is a vital element in production (precision below 10 microns).


At Joray-Wyss, we do not carry out galvanic treatments as this would require a significant investment unwarranted by the volumes. Galvanising is the science of coating. Using chemical baths and an electric current, an extremely thin layer of metal, (such as nickel or gold), is transferred onto the part, for protective or decorative purposes. We work closely with specialists in their field.


Depending on the material or the desired result, heat treatment serves to change the molecular structure of the material. It essentially aims to make the part harder and therefore more resistant to friction, or to stabilise its condition. More generally, this science of metallurgy contributes to the correct operation of watch movements.