Latest multi-function machine for turning components, in the same set-up, performs prismatic machining operations using an 11kW milling spindle mounted on a swivelling B-axis.

Okuma has launched a new, multi-function machine for turning components with up to 15kW (optionally 22kW) of main spindle power and, in the same set-up, performing prismatic machining operations using an 11kW milling spindle mounted on a swivelling B-axis. Called Multus B300, the slant-bed machine is capable of high accuracy in a normal shop floor environment, as tests have shown thermal deviation to be less than 10 microns over a 24h period despite a variation in ambient temperature of 8 deg C. This performance is a result of the application of Okuma's patented Thermo Friendly Concept to both the machine structure and the spindle, together with the use of 0.1 micron resolution linear scales in the orthogonal axes.

Available in the UK through sole agent, NCMT, the machine has the added benefit of the manufacturer's new OSP-P200 control, which uses an industrially-hardened PC to run both the Okuma operating system and Windows XP.

It is therefore possible to display Excel files listing machining instructions, tooling, offsets and performance results.

Two USB 2.0 ports are provided for program download, data capture and even the attachment of a bar code reader.

A new feature of the control is the most comprehensive collision prediction and avoidance system currently available.

The entire machining area is monitored in real time during an automatic machining cycle or, unusually, in manual mode as well, preventing the axes being wound by hand into a collision situation.

Whereas the focus of competitive simulation and interference-checking software is on the tool, holder, spindle and fixture, in addition to the component, Okuma takes a wider view, mapping also the spindle head, slideways and guarding.

The result is a reduction of up to 40% in the time needed to write programs involving the simultaneous interpolation of multiple axes.

Deriving from Okuma's MacTurn range of B-axis lathes, which include a conventional live tool carrier, the competitively-priced, single-turret Multus is nominally an 8in (or 10in) chuck machine that turns components up to 630mm diameter by 900mm long.

Weighing around 10 tonnes, it is capable of high precision machining - typically under 3 microns total tolerance on roundness of a component.

Nevertheless, it can remove S45C steel quickly - for example taking a 5mm depth of cut at 0.5mm/rev feed rate during OD turning, or milling 360cm3/min when roughing.

Such big, complex machines can often be cumbersome to use, but not so with the Multus.

Its spindle centreline is a little over a metre from the floor and 500mm in from the guarding, there is a lightweight door for ease of use, a swivelling operator's panel for the OSP control, and a coolant tank that detaches from the front, rather than having to slide it out lengthways.

Access to the magazine for exchange of HSK A-63 (or Capto C6) tools is similarly quick and easy, standard capacity being 20 stations, with 40 or 60 oprtional.

Roller bearing linear guideways allow weight-bearing capacity and precision to be combined with 40 m/min rapid traverse in X and Z, 26 m/min in the +/- 80 mm Y-axis and 20m/min for the W-axis motion of the optional, opposed spindle.

The latter is of equivalent capacity to the main spindle, offering up to 5,000 rev/min in two speed ranges.

The milling spindle, which swivels through 225 degrees in 0.001 degree increments, is powered by Okuma's patented Prex reluctance motor which drives both head rotation and the live tool at up to 10,000 rev/min.