Citizen Machinery has added a fourth variant to the Cincom L20 sliding-head CNC turning centre range. The top model, L20-XII, which has a 135° swivelling B axis mounted on the gang tool post for working at either of the opposed spindles, is now available with an automatic tool changer (ATC) for swapping up to 30 mm diameter cutters in a chip-to-chip time of four seconds. Both the tool carrier and magazine move in the Y1 axis to effect tool change.

Believed to be a first in a Swiss-type turning machine, the ability to exchange 12 different cutters in the lower position of the B-axis carrier greatly extends the machine’s versatility when executing angled cross-working or end-facing operations. A 13th tool can fix in the carrier’s upper position. While the cutters are normally live for performing drilling, slitting, hobbing or multi-axis milling, turning tools can fill the positions if expedient.

The total number of tools that may be mounted in the working area of the Cincom L20-XIIATC is 34, providing flexibility to ensure that components are machined in as few set-ups as possible, often one. A 2.2 kW motor at up to 12,000 rpm drives the cutters, so even small diameter mills are capable of productive metal removal rates.

As its designation implies, the lathe turns components from 20 mm diameter bar, although oversized options allow up to 25 mm diameter material to be accepted. Another feature contributing to the lathe’s versatility is the ability to switch quickly between Swiss-type operation and non-guide bush turning for more economical production of shorter components.

For further information
www.citizenmachinery.co.uk

Floyd Automatic Tooling has added the new Precitronics TOHP series of driven tooling with integrated high-pressure coolant feed to its portfolio. The new TOHP system offers through-coolant delivery up to 135 bar for driven tools and applications on sliding-head turning centres.

Available now, the Precitronics TOHP range of driven tooling is suitable for use on all types and makes of sliding-head and fixed-head machines fitted with a high-pressure coolant pump. Connecting the variety of live tooling configurations to the machine tool and the external high-pressure coolant pump is facilitated by a selection of quick-change connectors from the HEB range of locking and connecting plugs, flexible and rigid fluid distribution tubes, distribution blocks, connectors and adaptors – all available from Floyd Automatic.

In the work envelope, the Precitronics system is available for all spindle types with configurations such as ER, ER-A internal collets, CAPTO, KM, HSK, DIN, Weldon, MMT and ABS Komet. The flexibility of the system also extends to the drive connection, which can connect to all types of tool connection.

From a flexibility perspective, options for the Precitronics TOHP include an axial system, axial offset, axial speeders, radial double output, radial 90° system, radial 90° speeder, fixed angle, radial adjustable, axial multiple spindles, radial multiple outputs, polygon maker, thread whirling, gear hobbing and radial Y-axis – all of which can be configured to the specific turning centre.

According to Floyd Automatic, cycle time reductions of up to 30% are achievable by delivering high-pressure coolant directly to the cutting edge. Many of the systems also incorporate an additional coolant nozzle that simultaneously delivers cutting fluid to the shank of the tool, as well as the cutting edge, significantly improving cooling and swarf evacuation.

For further information
www.floydautomatic.co.uk

Components are becoming more and more complex, and drawing tolerances ever-tighter. The ability of a CNC turn-mill centre’s live turret tooling to move in the Y axis, as well as in X and Z, has therefore become increasingly important to facilitate high accuracy, one-hit machining. If travel in only the latter two axes is available, the milling of flats, deburring, and the possibility of machining pockets and off-centre features in-cycle, are either difficult or impossible.

The latest Miyano fixed-head lathe from Citizen Machinery UK to feature a Y-axis turret, in this case with all 12 tool stations driven, is the new BND-64SY for turning parts from bar up to 64 mm diameter. Joining a similar model that accepts bar up to 51 mm diameter through the main spindle, the 4.75-tonne machine is a mid-range, multi-purpose, twin-spindle turning centre. A ribbed monobloc bed slanted at 30°, and carrying precision-scraped square guideways, provides high rigidity, optimal thermal and mechanical stability, and excellent vibration damping, says Citizen.

These characteristics result in highly accurate machined components and longer service life of the tools, which can mount flexibly in the turret using multi-tool holders in any position. The robustness of machine construction allows the turning and milling of tough alloys and metals in their hardened condition, even when taking intermittent cuts. Polygon turning and thread milling are both options in the FANUC 0i-TD control, which is capable of simultaneous four-axis interpolation.

The specification of the Japanese-built machine includes turret travels in X/Y/Z of 175/75/435 mm, some 530 mm of sub-spindle axis travel, and up to 20 m/min rapid feed rate.

For further information
www.citizenmachinery.co.uk

The latest innovation from Tornos to support its sliding-head lathe customers is the pneumatic unloading system for the Swiss DT26 machine series. This new system avoids damage to any particularly intricate or fragile workpiece features.

For long workpieces with delicate features such as a fragile thread, the standard long-part system on Swiss DT and Swiss GT sliding-head machines may not provide the careful part handling required by the end user. For such types of workpieces, with a diameter up to 24 mm and a maximum length of 260 mm, Tornos now has a solution that enables delicate part removal.

Mounted on the tooling block for back machining, the system does not impair the possibility of using T510 and T520 tools. Ejection is via pneumatic operation, by using clamping jaws adapted to the respective workpiece type and material, ensuring there is no potential for part damage. 3D printing can facilitate jaw manufacturing, allowing complete customisation to the component form.

As a point of note, the system is equipped with sensors to monitor machine movements and provide optimum protection of the device. Furthermore, the design is such that it avoids interference with the machine’s counter-spindle.

With the addition of this system it is possible to keep a machine up to date and in conformance with customer component requirements, while employing only minor modifications. Tornos says that the retrofitting of existing machines is straightforward.

For further information
www.tornos.com

A restorer of vintage aeroplanes has increased its capacity and ability to produce challenging bespoke parts by investing in a new turning centre from Yamazaki Mazak. Kennet Aviation specialises in the renovation and servicing of historic aeroplanes, including Supermarine Seafires used in World War II, to the stringent standards required by the Civil Aviation Authority (CAA) – the UK’s specialist aviation regulator.

With the aim of enhancing in-house manufacturing capacity and growing its existing business, the company has invested in a Yamazaki Mazak Quick Turn 250MSY CNC turning centre. The new machine, built in the UK at the company’s Worcester-based European Manufacturing Plant, has enabled Kennet Aviation to quickly produce high-accuracy, bespoke aircraft components, and significantly reduce the time taken to restore aircraft.

Kennet’s investment has also opened up new business opportunities by enabling the company to subcontract its capability regarding the production of rare parts for vintage aircraft restorers and collectors worldwide.

Tim Manna, director at Kennet Aviation, says: “Existing components for these older aeroplanes can be very rare, and often not available anywhere. As we may only require very small batches, requesting parts from general subcontractors can be expensive and result in long lead times. We therefore decided to invest in a high-quality CNC machine tools to manufacture parts at Kennet, so we could bring selection, quality control and timing in-house.

“Mazak provided a brilliant service, and we’ve been very impressed with how quickly and accurately the machine has been able to produce parts,” he continues. “In fact, it has been so successful that we’ve since invested in a second machine, a VCN530C vertical milling machine with an additional rotary axis.”

For further information
www.mazakeu.co.uk