Jacobs gear hobber free#

Because of the difficulties involved in making epicyclical gears, very few were made by Strutt and Wigston. William Strutt designed his epicyclical geared clock in the late 1820s and his friend William Wigston built it. A conventional recoil escapement drives the pendulum. The external teeth of the ring wheel drive the escape wheel pinion.

Jacobs gear hobber free#

The planet wheel drives the internal teeth of the ring wheel, which is free to rotate on the centre arbour. The planet pinion engages this wheel and is forced to rotate while being moved around it by the planet arm. A sun wheel is fixed to the dial and cannot rotate.

Fixed to the centre arbour is a planet arm with a counterweight on one end and a planet wheel and pinion on the other end. The centre arbour carries the minute hand and is driven by a fusee/ great-wheel assembly. This clock is an excellent timekeeper as well as being beautiful and unusual. The collets are unusually designed to allow the individual setting of the hands. The motion work is based on the Ferguson Mechanical Paradox Orrery instead of the normal 12 to 1 gear train. Its eight-day run, spring-driven train is epicyclical (planetary gearing) and involves a ring wheel of 4½ inch (114 mm) ID and 5½ inch (138 mm) OD teeth. First made by Englishman William Strutt, it has a number of interesting and extremely unusual features not found in other clocks. The Strutt skeleton clock is one of the most interesting of all single-train skeleton clocks ever conceived.