FEATURE ON CNC MILLS & MACHINING CENTRES

ETG presents agile Axile G8 machining centre

The Engineering Technology Group (ETG) is introducing the new G8 machining centre from Axile. Since entering into an agreement with Axile to become the exclusive UK and Ireland technology partner, ETG is already enjoying a significant level of enquiries for the range of five-axis VMCs, heavy-duty double-column machining centres and mill-turn machine tools.

With a maximum loading capacity of up to 1300kg on a swivelling rotary table, the agility of the G8 enables the production of various large components. Also in the G8 Series is the G8 MT. This machine option offers both milling and turning in one machine, increasing operational flexibility, reducing set-up times and offering the potential to machine a wider variety of parts in a single set-up.

Axile builds the flexibility of the G8 and G8 MT upon a high-quality cast base that offers a structural foundation which optimises vibration damping and limits thermal behaviour.From an agility perspective, both models have direct-driven servo motors, double symmetrical and synchronised axes, linear scales with 0.1μm resolution,and double roller type linear guideways – all features that minimise backlash, vibration and elasticity.

Regarding specification, both the G8 and G8 MT offer a table size of 800 mm diameter with X, Y and Z-axis travels of 670 x 820 x 600mm and a maximum feed rate of 60m/min. The swivelling A axis moves to ±120° with a 360° continuous C axis. As standard, the built-in spindle come with a 20,000rpm asynchronous motor supplied with tools from two carousels that offer 32/64 position tool-change capability. The machine can also feature larger magazines with up to 120 positions.
For further information www.engtechgroup.com

Subcontractor installs large twin-column machine

Having a working volume of 2200 x 1700 x 750 mm, the Hurco DCX22i twin-column, bridge-type VMC with 8 tonne table load capacity is now the largest item of prismatic machining equipment on the shop floor at Jones Nuttall Precision Engineering in Warrington. The machine features a 40-station tool magazine, 12,000 rpm/18 kW spindle and rapids of 32 m/min in the X and Y axes, and 24 m/min in Z.

Jones Nuttall’s new DCX22i brings to 12 the number of machining centres in use on the shop floor, all of them supplied by Hurco, there being eight VM30i models and other VMCs also in operation. Additionally, a third of the lathes on site are Hurcos, both of them bar-fed. The TM10 has a 10-inch chuck while the 8-inch chuck TMM8 includes live tooling and a C axis.

Metals processed include Inconel, titanium alloy, stainless steel, steel, brass, aluminium, copper and even silver. Engineering thermoplastics such as nylon, acetal and PEEK are also common, as well as composites. Batch sizes range from one-offs to runs in excess of 1000.

Founded in 1971, Jones Nuttall has been a Hurco user since 2000, at which time the subcontractor decided to progress from manual tool-change mills to machining centres. The company opted for Hurco equipment due to the high build quality and spindle power of both the machining centres and lathes.

Geoff Brown, a machine operator at Jones Nuttall, says: “Hurco machines are very easy to program, set-up and use. The twin-screencontrol on the DCX really helps as I can program and edit on one screen, while the other screen displays the component and toolpath. The programming of all our Hurco machines is the same, so often one operator can run two or three machines.”
For further information www.hurco.com/gb

VMC for cost-effective machining of larger parts

Following the success of its M1 entry-level vertical machining centre, DMG Mori has introduced a larger version, the M2, with double the travel in the X axis at 1100 mm. The Y- and Z-axis travels are identical at 550 and 510 mm respectively, but maximum table load is nearly treble that of the M1, at 1700 kg.

The M2 retains the same fixed-table, travelling-column design, which minimises wear on the machine’s ballscrews and drives by not having to move the heavy table with its load to the spindle. Measuring 1400 x 600 mm, the clamping surface is sufficient to accommodate one large part or multiple smaller components set up in various fixtures (and even a 4th axis indexer) at the same time.

DMG Mori’s monolithic design of the thermally stable machine bed casting, which weighs 3400 kg, gives the M2 high rigidity and good damping properties. Minimal vibration, even when taking heavy cuts, protects the machine structure, provides long tool life and ensures good surface finish on machined components. The total installed weight of the machine is nearly 7 tonne in a compact footprint of only 7.3 sq m.

Users benefit from the choice of a 10,000 or 12,000 rpm inline spindle, of which the company has installed more than 4000 units worldwide, as well as a 24-pocket tool magazine and rapid double-gripper tool changer.

The M2 has roller guideways in all axes and machining dynamics are constant regardless of workpiece weight, report DMG Mori. A 20-bar internal coolant supply is optional. Control is via Siemens Sinumerik One touchscreen CNC, which has very few buttons, making it ideal for the new generation of setter-operators familiar with smartphones and tablets.
For further information www.dmgmori.com

Toolmaker upgrades capabilities with Mazak VMC

Toolmaker SJ Dimmock has upgraded its manufacturing capabilities with the purchase of the company’s first UK-made Yamazaki Mazak VCN 530C vertical machining centre.The family-owned firm, based in Dunstable, was set up in 1985, since building a reputation for manufacturing high-specification injection moulding tools for the aerospace, medical, food and drink, automotive, and Formula One industries.

Company director Jamie Dimmock says: “Following the retirement of one of our long-serving employees, I found myself in the position of having three machines that I’d need to train myself to operate. As they were older machines, I thought it would be more effective to sell the machines to finance a new, larger vertical machining centre.After a lot of careful consideration and time spent evaluating the performance of comparable machines, I chose the VCN 530C vertical machining centre from Mazak. Each day that goes by confirms it was a fantastic decision.”

The VCN 530C is a high productivity vertical machining centre made at Mazak’s European manufacturing facility in Worcester. Equipped with a 40-taper spindle, Mazak says the machine excels at delivering high-speed machining with maximum stability and rigidity thanks to its heavy-duty casting.

Typically, SJ Dimmock is working to exceptionally tight tolerances of ±0.005 mm to meet the surface finish requirements of its customers. Here,Dimmock says the VCN has transformed the company’s machining operations. “We’ve replaced three machines with one and vastly improved the surface quality of the moulds, while reducing the volume of second operation work. The processing speeds are exceptional with the Mazak, which has not only helped with the quality of work, but has also doubled our capacity.”
For further information www.mazakeu.co.uk

Subcontractor progresses to five-axis machining

In its 20,000 sq ft, purpose-built factory in Hayes, near London Heathrow airport, subcontractor Wellington Engineering uses 45 CNC machine tools to produce parts for sectors as diverse as aerospace, medical, semiconductors and cryogenics. The latest machine to arrive on the shop floor isa Hurco VC500i machining centre.

Owner and managing director Daimon Wellington says: “We recently adopted a strategy of looking to take on more complex prismatic machining work and had already identified a number of contracts. It was just a question of finding a suitable machining centre.Full five-axis capability was the next step up for us in terms of technology and, as we use a lot of Hurcos, we decided to source our first true five-axis machining centre from them.”

The cantilever-type VC500i is ergonomic for easy operator access, has a 520 x 450 x 400 mm working volume and a ±100° swivelling trunnion carrying a rotary table, suitable for machining five faces of a component in a single set-up. It reduces the number of separate operations needed compared with using the subcontractor’s three- axis machines, including those fitted with single- or two-axis dividing heads.

Wellington says: “Our other machining centres were taking too long to produce the increasingly complex components. Productivity drives profits and we’ve had excellent results in this respect since the five-axis Hurco arrived. Parts come off much quicker and we’re not tying up the capacity of our other machines and their operators. Also there are far fewer issues with workholding and there is less deburring and hand fettling, all of which saves time.With five-axis strategies, jobs are coming off more economically in shorter cycle times.”
For further information www.hurco.co.uk