TRADITION · PRECISION · PERFECTION - Erwin Sattler

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Dimensions: Height 145.5 cm Width 42.5 cm Depth 31,0 cm Secunda Accurata 1958 Black varnish with walnut root wood Secunda Accurata 1958 – Improved Free Strasser Escapement This model embodies our demand upon ourselves to create a purely mechanical precision pendulum clock representing the best in reliability and accuracy that can technically be achieved. To reach this goal, we pay the greatest attention to every detail in design and subsequent manufacture. Therefore, after being produced by the most modern machines, all components are carefully finished by hand, the brass parts gold-plated and the steel parts polished and some blued. The 1958 model continues the tradition of the world’s best mechanical timepieces and represents the climax of precision clockmaking in our manufactory. The design of this newly developed 30-day movement containing a visible free Strasser escapement does not need to shy away from being compared with vintage movements and is even superior to them in its precise manufacture using the most modern technologies. An example of the 1958 has been on exhibit at the permanent exhibition of timekeeping instruments in Munich’s Deutsches Museum since 1996. To ensure that <strong>Sattler</strong> Caliber1958 functions perfectly for decades, the gear train and escapement parts move on jewel and ball bearings to minimize friction. All brass parts such as the heavy base plates, the bridges and cocks, the pillars, and naturally the gear wheels are precisely milled, finished, and then gold-plated for permanent protection. Of course, only hardened, polished steel pinions with a high number of teeth are used. These steps are taken to considerably reduce wear within the movement. And we need only a small driving weight to achieve a power reserve of thirty days. The free escapement invented by Prof. Strasser is a technical specialty that decouples the pendulum from the gear train so that it oscillates almost freely. This pendulum clock’s unique technology naturally deserves a correspondingly attractive and high-quality case. We have fitted a curved five-millimeter-thick piece of mineral crystal into a stable metal-and-wood frame and secured it to a very solid black-varnished back with hinges and fasteners manufactured in-house. A mirror-polished walnut root wood tray is fitted into its center. The bottom of the case holds accessories like the winding crank and fine adjustment weights. A rubber gasket encircling the case optimally protects the clock from dust. Vibrations and shocks transmitted to the pendulum and its spring can have a negative effect. In order to avoid shocks to the pendulum and the movement when opening or closing the case, it has been removed from direct contact with the case and secured to a stable plate on the case back. 28 29
Secunda Accurata 1958 Air pressure compensation. In order to avoid a change in the period of oscillation when the air pressure changes, the pendulum is outfitted with an air pressure compensation device. If air pressure increases, the period of oscillation is lengthened. With five aneroid capsules and a precisely calculated weight that moves up or down corresponding to the changes in air pressure, these influences and thus a change in the period of oscillation are compensated. Temperature compensation. The rate precision of a pendulum clock does not exclusively depend upon the mechanical properties of the mechanism, but also on external physical influences. The pendulum’s period of oscillation is primarily determined by its length. Variations in temperature, however, result in a corresponding change in the materials used to create the pendulum. The pendulum rod of the Secunda Accurata 1958 is made of an ironnickel alloy called Superinvar, a material that can boast minimal linear expansion upon temperature change. In order to compensate for residual expansion as well, the pendulum is equipped with a temperature compensation device. Rate deviations of less than one second per month can be achieved with this clock. Titanium lever for energy transmission The function of the free Strasser escapement. The escapement of a clock, comprising the pallet assembly and the escape wheel, is the connecting link between the gear train and the oscillation system. The pendulum receives energy from the escapement, some of which gets lost due to friction in the suspension and air resistance. Until the free Strasser escapement was invented, the so-called Graham escapement served as the connecting link between the pendulum and the gear train. In this escapement, the pallets and the pendulum form a rather rigid connection via the pallet fork, the disadvantage being that even the slightest variations in the driving force are transmitted from the gear train to the pendulum. Impulse pallet Locking pallet Escape wheel Pendulum drive springs These energy variations result in a change of the pendulum’s amplitude of oscillation and thus slightly influence the period of oscillation. The invention of the free Strasser escapement made it possible to improve the already excellent rate accuracy of precision clocks, primarily achieved by decoupling the movement to a large extent from the oscillating system. The pendulum only remains linked to the pallets and movement by the mainspring. Thus, the pendulum is decoupled and swings nearly freely. The energy necessary to maintain oscillation is supplied to the pendulum at its fulcrum point by two thin steel springs pre-tensioned by the interplay between the escape wheel and the pallets around a precisely defined angle. Thus, the pendulum is supplied with exactly the same energy at every half-oscillation – in other words, once every second. This is why these escapements, like the one found in our precision pendulum clock Secunda Accurata 1958, are called constant force escapements. 30 31
Page 1 and 2: Tradition · Precision · Perfectio
Page 3 and 4: Contents Page Company History 3 Man
Page 5 and 6: Movement Quality The production of
Page 7 and 8: Precision Pendulum Clocks What is a
Page 9 and 10: Dimensions: Height 105 cm Width 27
Page 15: 26 Dimensions: Height 145 cm Width
Page 19 and 20: The integrated strike mechanism is
Page 21 and 22: Classica 60 Black varnish Cherry wo
Page 23 and 24: Black varnish Modern arabic dial Cl
Page 25 and 26: Black varnish Silver-plated dial Cl
Page 27 and 28: For centuries bracket, mantel, and
Page 29 and 30: Stella Yellow gold-plated Anniversa
Page 31 and 32: Grandfather Clocks No other timekee
Page 33 and 34: Excelsia Exclusive Grandfather Cloc
Page 35 and 36: Dimensions: Base width 52 cm Width
Page 37 and 38: Carbonautis Rosé gold-plated Dimen
Page 39 and 40: Nautis - a Premium Marine Clock for
Page 41 and 42: Navalis with name plate It is no lo
Page 43 and 44: Tempus Mobile Atlantis A variation
Page 45 and 46: Regulateur Classica Secunda Dimensi
Page 47 and 48: 90 Trilogie Dimensions: Diameter 44
Page 49 and 50: Rotalis Precision Watch Winders Thi
Page 51 and 52: Rotalis IV Black varnish with polis
Page 53 and 54: Rotalis 60 Dimensions: Height: 200
Page 55 and 56: Technical Details Model Semi Secund
Page 57 and 58: Technical Details Model Navalis The
Page 59: Erwin Sattler OHG Großuhrenmanufak

TRADITION · PRECISION · PERFECTION - Erwin Sattler

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