How Does the Crown of a Watch Arise?

No watch crown Running.

It crowns the clock–in the truest sense of the word. Because without the crown of a clock nothing goes. Moreover, the small part has more inner life than one thinks.

This minikins does not even look so much refinement: usually between two and a half and up to ten millimeters in diameter, the watch crown is a sophisticated technical system. It is the vehicle-moving interface between the outside world and the clockwork, the direct connection to the heart of the watch.

The weaknesses of the watch crown

However, it can also become a weak point: for example, in relation to the waterproofness or the pressure exerted on the shaft leading from the work of the Screw crowns. This must not be too strong, because it could interfere with the mechanics, but also not too weak for the work to be optimally shielded from the outside. The inner life of the crown, which consists of several different parts depending on the complexity, is therefore no less careful to manufacture than its exterior. Their production is dedicated to proven specialists who are also responsible for the production of pushers.

Who is the crown of a watch?

Inexpensive and simple crowns and pushers come today mostly from Asia, especially China and Taiwan, where they can be produced relatively cheaply. According to LocalBusinessExplorer, technically higher-quality watch crowns–with embossed logo, in special shapes, in precious metals, with inserts made of lacquer or precious stones–are often produced in Switzerland as well as in Italy, France and Germany. One of the world’s leading manufacturers is the French Jura-based company Cheval Frères S.A. in École-Valentin, a suburb of Besançon. In Germany, too, there is a specialised manufacturer: the Uhrkronen company Vogler in Pforzheim. The company cooperates closely with Cheval Frères S.A. and has its own production, the general representation of the Cheval products for Germany and Austria. 1866 founded by Christian Haulick, the company is now headed by Susanne Vogler. In the Pforzheim workshops, a standard range of crowns made of electroplated brass is produced, but the individual wishes of the customers are increasing. In particular, models in steel, gold and titanium are in demand here. Usually you get a logo and are profiled with 22 teeth; But also many other profiles are possible. The requirements for these special requests move from 30 to 500 pieces.

What types of crowns are there for a watch?

The program extends from the simple Uhrkrone without filling, water or dust protection up to the double O-ring crown and screw crowns, which are waterproof up to 200 meters deep. “On high-quality watches, a screw crown is actually standard today,” says Susanne Vogler. The principals of your company are predominantly watch brands, case manufacturers and Furnituristen from Germany. These usually provide samples or even only the housing for which the Crown should fit. The exact design and technical drawings are then created by the company Vogler.

How is a Uhrkrone made?

The production begins with metal rods, which are bought in different thicknesses and profiles or are turned on the machine by Vogler on CNC machines. The material is inserted and processed into the magazine of a machine–a CNC machine or a conventional automatic lathe. The turning of the blank can take only 30 to 40 seconds for simple models in steel, but for difficult forms it takes several minutes. In this phase, the most elaborate is the programming and installation of the tool, which is partly made specifically. This first setting is a major cost factor in production; Once the machines are programmed and the required shapes or embossing tools are made, these costs are not incurred in the production of a second edition.

Precise crowns for precise wrist watches

It is important to be precise right from the start: The dimensions have to be accurate, even during production, they are controlled by hand again and again, since the dimensions have to fit on the hundredth of a millimeter. Today, this is ensured by modern machines, which have different attachments and tools and which rotate in a single operation in different directions, drilling, milling, thread cutting and lateral toothing or profiling. When the watch crown is turned off, a neck remains. The turning out takes place in several steps, in which the inner side receives a profiling or paragraphs, which later give an O-ring seal of rubber and a cover plate halt. This so-called filling of the watch crown is done by hand at numbers below 3,000: The tiny O-ring is inserted, a cover plate is placed on the crown and closed with a flange tightly. This very difficult work is performed mainly by fine mechanics. Even more complicated is their work at screw crowns, which consist of five to six, sometimes even ten tiny parts: The head, the tube, the O-ring seal, the spring and the threaded axis, which is moved through the spring. The fitting counterpart of the Crown, the tube–a tube through which the lift shaft leads and over which the watch crown grabs–is also provided with thread and O-ring seal. This tube–screwed into the watch case or pressed in and glued–is made together with the crown.

Back to the order of the Crown production: After the initial turning of the crown, the blanks are thoroughly cleaned. If the customer wishes a logo, this will be embossed; Partly also lasered. For the embossing process, the Crown core is placed on a metal to apply an elevated motif with a press with a logo tool under high pressure. Finally, the watch crown is galvanically or polished. The latter is done mechanically or with high-quality models by hand. After a final cleaning the crown heads are ready and ready for the already described filling.

In general, the manufacture of crowns for wrist watches, including various cleaning, involves ten to twenty steps. With very elaborate gold crowns–for example, a screw crown with an integrated pusher–it can also become much more. Speaking of pushers: their production is also the responsibility of the Uhrkronen manufacturer and essentially resembles the manufacture of the crowns. With the same requirements: precision is the highest bid.

Tags: automatic clocks, clock hand lift