Cazeneuve (company)

The company A. Cazeneuve was founded in Paris by André Cazeneuve in 1905 and produced steel wool for grinding and cleaning floors. He had designed a specialized lathe to turn out the long, even and sharp chips needed for this purpose.

In 1920 the company was in dire straits economically. The technical director Henri Bruet took over ownership of the company in exchange for unpaid wages. He started manufacture of lathes of the series LO with overhead belt drive.

The son of Henri Bruet was also named Henri. He attended the École nationale supérieure d'arts et métiers, and became a mechanical engineer like his father. His diploma thesis was the design of the lathe HB, named after his own initials. This model came into production after Henri graduated, in 1949. The HB was revolutionary for its time. 40 000 machines were produced in the course of 50 years.

From 1959 to 1973 Cazeneuve also manufactured the HB series at its own factory in northern Tokyo. Approximately 6000 units were sold to Southeast Asian and American customers. This series was also made under license in Spain at the Amutio works.

From 1950 to 1964 Henri Bruet was issued a series of patents for novel mechanisms and arrangements for use in lathes. Most of these ideas found their way into a very unconventional, courageous and beautiful design: The 360 HB-X (x for experimental). This lathe had a belt variator actuated by a hydraulic servo arrangement, so that infinitely variable spindle speed was available by pushing a small lever on the right side of the apron. The hydraulic pump also lubricated the spindle and feed gearboxes.

There was proper shielding of the operator from chuck contact, coolant and flying swarf. Both leadscrews ran in sealed oil baths. The apron was of a totally novel design. The leadscrew engaged with a worm wheel instead of the usual halfnuts. The apron gear system could engage every metric and imperial thread directly and automatically. The leadscrew could be disengaged for each cut without losing register. This made it easy to turn and thread directly against an endstop, even into blind holes. Accordingly, the lathe was equipped with an assortment of endstops both for the saddle and crossfeed. The endstop trip mechanism had a sensitive adjustment. There was a foot-operated emergency stop and spindle brake.

The tailstock was also of completely new design. The quill could be fed by three different methods: Rapidly by a large starwheel, by worm reduction via a smaller handwheel, or automatically by geared connection to the saddle. The transverse adjustment of the centre was done by an eccentric mechanism. The centre was protected from overload by a spring arrangement.

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