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Vertical turning lathe for demanding applications
A
NCMT product story
Edited by the Engineeringtalk editorial team
Feb 20, 2001
A new, hanging-spindle, vertical turning lathe (VTL) designed for continuous and demanding production applications has been introduced by the Japanese manufacturer, Okuma.
A new, hanging-spindle, vertical turning lathe (VTL) designed for continuous and demanding production applications has been introduced by the Japanese manufacturer, Okuma.
Designated LVT300, the machine is available in the UK through sole agent, NCMT.
With load/unload functionality built into the spindle axes, the machine can be configured to suit end user applications without the need for costly workpiece handling arrangements.
The VTL is thus well suited to integration into automated manufacturing systems and its compactness results in a footprint of less than 40 sq ft.
Construction follows classic Okuma practice, using a box-type bed to provide maximum rigidity and freedom from thermal distortion.
By placing all linear axis movements on the saddle-mounted headstock, and using a fixed turret, it has been possible to optimise chip evacuation.
All machining is carried out over an open drop onto the chip conveyor, virtually eliminating heat build-up due to swarf accumulation.
Variants of the machine are available for turning and mill-turning.
In both cases, 12-station turrets are provided but in the case of the LVT300-M, milling and drilling spindle speeds in the range 45 to 4,500 rpm are available to operate in conjunction with a 360,000 position C-axis.
Power for turret index and rotary tool operations is provided using Okuma's revolutionary Prex motor which offers 5.5 kW maximum power output.
On both machine derivatives the main spindle is supported on substantial, widely spaced X- and Z-axis recirculating ball bearing slides.
Maximum turning diameter is 280 mm, maximum component length is 200 mm, and components weighing up to 20 kg can be accommodated.
All work handling is carried out by the main spindle which doubles as an integrated picker/loader.
To that end, the X-axis is provided with extended travel totalling 1,055 mm, while X-axis rapid traverse speed is 60 m/min to minimise non-machining time.
Travel in X is 210 mm, while Z-axis travel is 360 mm with 30 m/min rapid traverse speed.
The 22 kW main spindle provides steplessly variable speeds in the range 40 to 4,000 rpm.
Control is by Okuma's own OSP-U100L CNC system which may optionally incorporate the manufacturer's graphical programming system and tool path simulation software for ease of use.
Other options include in-process gauging facilities and a touch-type tool setting probe.
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