A bit different

Innovation & technology

We place high standards on the quality of our movements. That is why we design and manufacture many components ourselves that are important for the precision and reliability of our movements. The patented, particularly shock-resistant woodpecker regulation is the best example of this. This was necessary because we manufacture many sporty wristwatches or watches that have to do their duty in the hard everyday life of sea rescue on water and in the air.

Tradition and Innovation

The movement technology
from Mühle-Glashütte

What distinguishes a Glashütte watch from other watches is the movement. It is of the utmost importance in the German watchmaking town. And so there are also some special features that are characteristic of a Glashütte movement: The three-quarter plate is one of them. Introduced in 1864, it is now considered a typical feature of high-quality Glashütte watches. Our three-quarter plate, newly developed in 2008, is used in Mühle movements with the designation “MU 94-“.

 

Another traditional feature is the swan-neck fine adjustment, which lives on in our woodpecker-neck fine adjustment, which is particularly shock-resistant. Finally, we would like to mention the screw-down gold chatons with their magnificent play of colors in red, blue and gold. They find an appropriate home in the traditionally oriented and finely finished Robert Mühle calibers of our manufacture line.

patented

woodpecker neck fine adjustment

You should be able to rely on our watches at all times. That’s why we always do a little more than necessary. For example, our woodpecker neck regulator is used in a Mühle watch even if – unlike our S.A.R. Rescue timer – it does not have to hold its own during risky rescue operations. We developed the fine adjustment in 2003 to ensure the precise running of our movements even under the toughest operational conditions.

 

With conventional fine adjustment systems, a strong shock can cause the regulator arm to jump up between the regulating screw and the counter-pressure spring. This can change the position of the balance staff or the regulation of the watch. Our specially shaped woodpecker neck spring prevents the regulator arm from moving upward by engaging a semicircular recess in the regulator arm. In this way, it not only presses the regulator arm laterally against the fine adjustment screw, but also simultaneously downward onto the balance cock.

High accuracy

The fine adjustment screw

The woodpecker neck fine adjustment is a balanced system consisting of a fine adjustment screw, regulator arm and counter-pressure spring. The movement is regulated by turning the fine adjustment screw. This moves the regulator arm and lengthens or shortens the effective length of the balance spring. The fine adjustment screw, in combination with the specially shaped counter-pressure spring, permits particularly sensitive and thus precise regulation of the movement. It is secured against subsequent rotation by a clamping screw.

Form follows function

The woodpecker neck spring

Thanks to its specially shaped end, the counter-pressure spring of the Mühle fine adjustment engages in a semicircular recess of the woodpecker neck hand. In analogy to the woodpecker neck spring, the regulator arm is called the woodpecker neck hand. In this way, the woodpecker neck hand is not only pressed laterally against the fine adjustment screw, but also simultaneously downwards onto the balance cock. In this way, the woodpecker-neck spring fixes the regulator arm in position and thus withstands even stronger vibrations.

From swan to woodpecker

The name of the woodpecker neck adjustment

The patented woodpecker neck fine adjustment - or woodpecker neck adjustment for short - was introduced in 2003 as a further development of the traditional Glashütte swan neck fine adjustment. It owes its name to the characteristically shaped spring. This is because the shape of the spring resembles the neck and head of a woodpecker. The shape of the woodpecker's neck spring is primarily due to its function, but at the same time makes it unique.
Making efficient use of gravity

The characteristic
Mühle-Rotor

For a watch to function reliably and precisely for a long time, all components of the movement must work together perfectly: from the drive to the gear train to the adjustment. That is why we have not only developed our own fine adjustment, we also pay the utmost attention to the rotor.

 

The Mühle rotor provides the drive for our automatic watches. Set in motion by the wearer’s arm movements, it uses its rotation to wind the watch. To ensure that this happens efficiently, we manufacture it according to our designs on our own CNC machining centers. Because even here, everything has to be just right and manufactured to the tightest tolerances. Our rotor consists of the engraved center segment and a special heavy metal semi-tire that reinforces the rotor’s ability to rotate downward due to the earth’s gravity.

 

This flywheel is riveted to the outer circumference of the center segment with four or five gold-colored rivets. In its center we press a low-friction ball bearing, since the bearing of the rotor is particularly stressed by the constant movement. Finally, the rotor is nickel-plated or rhodium-plated, i.e. coated with an extremely thin layer of an element from the platinum group of metals. This gives it its shiny silver insensitive surface.

Keeping Glashütte tradition alive

The new developed
three-quarter plate

The three-quarter plate is a typical feature of high-quality Glashütte watches. It serves as a stable bearing for the mainspring barrel and wheel train and is so named because it covers about three quarters of the movement. As is tradition, we have equipped our three-quarter plate with the classic Glashütte stopwork and a removable escape wheel bridge.

 

The latter not only looks very nice – with its red bearing jewel and the two blued screws. Above all, it facilitates a revision of the watch, because the escape wheel or even the entire escapement can be removed and cleaned more easily. With the three-quarter plate, we were able to increase the longevity, serviceability and aesthetics of our chronograph movements. And because we not only install our three-quarter plate in them, but also designed the regulation, balance cock, automatic bridge and rotor for them ourselves, we proudly stamp our own caliber designations on them.

Works almost smoothly

The Glashütter Stopwork

During winding, the barrel rotates and thus stores the winding energy for the movement. The ratchet wheel sits above the mainspring barrel and, in combination with the ratchet, prevents it from turning back and immediately losing the spring force. When the watch is wound, the ratchet rattles over the teeth of the ratchet wheel, as its pawl is pressed towards the ratchet wheel by the ratchet spring. The ratchet keeps the pressure on the ratchet wheel low and minimizes wear.

Easy to maintain

The removable escape wheel bridge

A removable escape wheel bridge is a traditional feature of Glashütte movements. It is used to support the escape wheel, which is one of the most heavily stressed wheels in the movement. To facilitate its maintenance, the bridge can be removed without completely disassembling the movement.

Functional aesthetic

Useful finishing of our movements

We are watchmakers first and foremost. All the work we do on a movement is first and foremost to make our timepieces more precise and reliable. So we do what we do with our watches not just for aesthetic reasons, but primarily for functional reasons. Functional aesthetics is what we call it.

 

All moving parts in a watch movement are subject to a certain amount of wear – but the smoother the gear train runs, the less of it. That is why metal surfaces are compacted, hardened and polished. The very beautiful polishes in particular provide the surface of levers and springs with more density and tension in the process: for the benefit of greater precision.

Play of colors

Blued screws

The attractive color of our blued screws also has a functional reason. This is because bluing, also known as tempering, provides additional protection against corrosion. In this process, each screw is subjected to a special procedure. First, they undergo a five-stage polishing process using various materials and abrasives or polishing agents. After polishing, the screws are heated to 300° Celsius, which gives them their beautiful blue color.

Decorative

Glashütter grainings

In addition to these functional finishes, we also apply cuts that we use for traditional reasons to embellish the movement, such as the Glashütte sunburst cut. These cuts are always applied by hand and make each watch unique. In the past, they also had a specific function: they were used to remove machining marks that occurred during the manual sawing or drilling of the parts.

Manufacturing line

The RMK in-house movements

The hand-wound movements of the “R. Mühle & Sohn” manufactory line were designed entirely in the spirit of traditional Glashütte watchmaking. Thus, for the first time, an engraved balance cock and colorful screwed gold chatons can be admired in these Mühle movements.

 

In terms of fine adjustment and cover plate, the manufacture calibers – in contrast to the Glashütte movement technology common today – go their own way. Naturally, our further development of the swan-neck fine adjustment is used in them: the particularly shock-resistant and patented Spechthals fine adjustment. The cover plate was also designed as a three-fifths plate with a separate cock for the escape wheel.

tradition vs. modern

combination

Even at the design stage, traditional and innovative features were harmoniously combined in the Robert Mühle calibers. This also applies to the aesthetic and functional finishing of the movements. The crown and ratchet wheel, for example, are finished in the classic Glashütte sunburst finish – while our finishers did not miss the opportunity to provide the rare three-fifths plate with Mühle’s own surface decoration.

Perfect finishing

The new Mühle ribbing

At first glance, the finish of the three-fifths plate resembles a traditional belt grind, but it is much finer in execution. The new mill finish is characterized by 4-millimeter-wide stripes that are created with the help of a rotating milling pin. This must be moved over the blank at an exact angle of 0.5 degrees in candle-straight lines and at a precisely defined speed so that it can develop its full effect.

Beautiful as seldom

Three-fifth plate

In addition to the famous three-quarter plate, Glashütte repeatedly used other shapes for the cover plate. Movements developed shortly before 1950 were equipped with a three-fifths plate and a separate escape wheel cock. With the return to the rare plate form, we expand the movement technology in use today in Glashütte.

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