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Owner and/or user of an HB lathe?
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Would you like to learn more about these historic machines? Trace the history of traditional HB lathes with this CAZENEUVE section!
The engineer of the HB lathes, Henri René BRUET, son of the manager of the CAZENEUVE company in 1947, Henri Charles BRUET, joined the company and its technical services the same year. It was at this time, and even before this integration, that Henri René BRUET devoted himself to the creation of new lathe models. This is how the HB conventional lathes were born, the first modern lathes of the time. These iconic models of the brand have sold several thousand units all over the world. Here are some of the features that made these lathes so successful.
The HB 500 and HB 575 receive a 12 HP engine and the HB 725 a 22 or 25 HP engine. These engines can be temporarily overloaded. Of course, on request, these lathes can be equipped with a lower motorization.
The HB lathe comes with speed ranges up to 3,200 rpm in the HB 500, 2,500 in the HB 575 and 2,000 in the HB 725. These lathes can of course be supplied with lower speed ranges.
The originality of the assembly of the spindle and the construction of the turret (which we guarantee to be positioned to within 3 microns) and the importance of the carriage guides related to our manufacturing quality ensure to these HB lathes an exceptional quality.
Thanks to a large diameter graduated drum and a micrometric device acting on the screw of the cross slide, it is possible to read directly 0.005 mm. For longitudinal measurements, a graduated drum has a vernier 1/10 very legible, allowing precise reading.
HB lathes are extremely easy to handle thanks to controls that do not require the operator to move and to a flexible and powerful brake that ensures the almost instantaneous stopping of the spindle at any speed. The new "reaction" armour allows the longitudinal and transverse movements to be stopped either by a stop, or by acting on the single control lever, or by stopping the rotation of the handwheel of the movement in question by hand. With this armour, once one of the movements has been stopped either by blocking or by a stop, it is possible to engage the second movement. A very sensitive and accessible device makes it possible to adjust the traction power of the armour to the cutting effort and to obtain an incomparable smoothness of manoeuvre and precision in the operations of semi-roughing or finishing. All these measures allow a significant reduction in idle time.
All moving parts are lubricated without splashing, with oil that is constantly cleaned and pressurised in the parts to be lubricated, especially in the rotation axes. For those parts that can only be lubricated with waste oil (carriage slides and drag, 4-tool turret), a built-in manual pump sends an oil that expels all foreign particles. In addition, the transverse screw is constantly in an oil bath. HB lathes thus retain their precision and efficiency qualities over time.
Other improvements were also made to these lathes, including
- Very generously dimensioned bench (width 400 mm) with triangulated spacer ribs ensuring absolute rigidity, while leaving ample passage for chip evacuation. This bench, for all lathes up to 1,500 mm between centers, can be delivered hardened.
- Steel transverse carriage.
- The "Whitworth" pitches are obtained by a 127-tooth wheel, permanently mounted in the lyre making the change from metric to "Whitworth" pitches extremely fast.
- The standard CAZENEUVE conical nose gives high precision and absolute rigidity in the fixing of chucks and plates, while ensuring safety in both directions of rotation of the spindle. Compared to other conical noses, it has less overhang and reduces bearing wear.
- Fast belt replacement thanks to direct access to the pulleys by simply opening a cover and easy adjustment of the tension of these belts by very accessible cylinders.
- Instant locking of the tailstock by lever.
- Very fast changeover from cylindrical to conical turning.
- Some lathes can be supplied with either a straight or 1/2 broken bench.
- Two models can be built: simple turning lathe - tooling and manufacturing lathe for turning and threading.
- The HB 725 straight bench models can also be supplied with a quick movement system for the longitudinal and transverse carriage. These movements are achieved by operating a single lever that controls both normal and rapid movements for both axes.
- HB lathes can be fitted with a universal hydraulic gearbox, as described below.
- The HB CA (and the derivatives) lathes are variants of the HB models. They are automatic-cycle lathes, i.e. they add to all the possibilities of the HB with a copying device (= hydraulic reproducer), the possibility to operate in automatic cycle.
This HIGH PRECISION device (easily removable independent monobloc assembly) can be adapted to all HB turning or turning and threading, whatever the height or the distance between centers.
The master parts or templates are placed between two headstocks attached to the back of the bench. These headstocks are mobile and have longitudinal and transverse micrometric adjustment.
Because of its rigidity, the reproducer can use the full power of the lathe engine.
The maximum length of the workpieces that can be machined is equal to the distance between centers on which the device is mounted (650 to 6,000 mm).
If the cross slide is in a certain position, the maximum distance between the different diameters of the workpiece is 220 mm. However, this dimension is increased by operating the cross slide.
The tool carriage is inclined at 60°, which allows the machining of straight shoulders.
The accuracy guaranteed is in the order of 2 to 3/100 millimetres depending on the shape of the part.
IN SUMMARY: This device gives the HB Turning and Threading Machine the production possibilities of a special machine while maintaining the universality of a tooling lathe.