Previously working as an engineer in the Formula One industry, it was the unsociable and unpredictable working routines that led Allan Carabine to set up his own machine shop in 2011. Working in motorsport taught the new business owner two valuable lessons: start with a five-axis machining centre and then implement leading CAM software to drive the machine.

For Milton Keynes-based MK Precision Engineering, this marked the arrival of a Hurco five-axis VM10U and HyperMill CAM software from Open Mind Technologies as the company’s very first acquisitions. Commenting upon this selection, which was to base the foundation of the company, Carabine says: “Everyone can do three-axis work, so when I started I wanted to start with a five-axis machine. The next thing I had to get was HyperMill CAM software.

“I’ve worked for Formula One teams as well as some of the most prestigious subcontractors in the motorsport supply chain; all used HyperMill as it is the only viable package for companies serious about five-axis machining,” he continues. “Open Mind confirmed the post-processors were compatible with the VM10U and from that point, the CNC controller became irrelevant as everything is modelled and programmed in HyperMill.”

The Buckinghamshire business started by machining steel mount components for a camera company; this soon evolved into five-axis Formula One work and six years later the small business has expanded to machining a complete range of rail, cryogenics and motorsport parts.

Although the business manufactures production runs for the defence industry, the average batch size ranges from 10 to 20 parts, machining materials from aluminium, stainless steel, plastic and nylon composites. Of course, to take on the additional work, MK Precision required more staff and machine tools. The acquisition trail brought the subsequent arrival of two three-axis Hurco VM30 machines, a larger five-axis VMX30U, a TM8i turning centre and a CMM for ensuring the conformity of Formula One components. However, 40% of the company’s work remains prototype business and this is where HyperMill really benefits the company.

“The programming time will be anything from 20 to 50% of the overall time spent on each part, something that obviously varies with the complexity of individual jobs,” says Carabine. “With prototype parts requiring up to four hours of machining, the programming time can be anything from 30 minutes to 3 hours. One of the main benefits of HyperMill is the modelling and collision checking of the parts. Additionally, the post-processors run error-free to give us the utmost confidence that we can load a part on to a machine and whatever program we load, we can run it without waiting nervously. This confidence is set in stone with a rework cycle that creates the toolpaths with comprehensive collision detection. Here, the cycle revisits all toolpaths prior to sending the program to the machine tool.”

The growing workload recently noted an additional seat of HyperMill arriving at MK Precision. According to the company, the first seat has delivered remarkably short programming times; a necessity for a machine shop manufacturing low quantity, highly complex parts. The second seat is now underpinning this strategy.

From a cost perspective, HyperMill has reduced tooling consumption by almost 80% and slashed cycle times by over 50%. These savings are credit to continually evolving strategies that are being developed by Open Mind. Some of the new strategies that are now being applied were unfamiliar to the company when it bought its first seat some six years ago. For instance, the statistics are partially credit to innovative trochoidal milling strategies, something that is also generating a noticeable reduction on spindle load at MK Precision.

Another strategy that is prolonging tool life and improving consistency and process reliability for unmanned machining is the five-axis optimised rest material machining strategy. The new cycle generates high-speed cutting toolpaths for rest material machining based on the preceding roughing operation. Shorter tools can be used with improved stability for machining excess material from cavities and hard to reach areas.

“This feature has given us more confidence when machining parts with cavities,” says Carabine. “Previously, we would order extra tools in preparation for tool breakages in cavities, but the five-axis optimised rest material strategy has given us confidence in the process, the cutting tool and the ability to run unmanned machining where necessary.”

With customers that frequently require engraved components for traceability, MK Precision is making use of the five-axis contour milling strategy.

“There are certainly projects that we would never have won without the five-axis contour milling strategy,” says Carabine. “It enables us to engrave parts on irregular and round parts. Easy to program, the strategy keeps the cutting tools perpendicular to the component face to generate simple and precise part marking. This has been a huge benefit when we have needed to engrave batches of parts with individual part numbers. Even when doing this, HyperMill has a sequential feature that automatically changes the part number on each component.”

MK Precision has a number of turned parts which often require second operation machining on one of the company’s five-axis Hurco machines.

“HyperMill accommodates all our turning requirements and the multi-axis shape-offset module has the ability to trim toolpaths automatically to in-process stock, thereby saving manual tool edit procedures,” explains Carabine. “This utility covers stock model generation where we can easily transfer the stock model to our three- or five-axis machines. As a result, we can streamline the transfer of parts from one machine to another while saving considerable programming times. It also reduces the machining times as it intuitively recognises what stock has already been removed.”

In addition to the HyperMill CAM package, MK Precision is making good use of HyperCAD-S.

Concludes Carabine: “Although HyperMill enables us to model and program parts extremely quickly, some customers, particularly in the rail industry, only supply physical 2D drawings and not common electronic formats such as STEP, IGES, DXF and STL files. Using HyperCAD-S, we can quickly generate component models from 2D drawings and these are rapidly expedited to create CAM programs. Additionally, we can accept electronic files from customers, drop them into HyperCAD-S, manipulate and edit the files where necessary and then generate part programs.

“Overall, Open Mind has delivered huge savings in programming times, shop-floor production, tool life and lead-times.”
For further information www.openmind-tech.com

Investment by ATS UK in a Sodick AG60L from Sodi-Tech EDM is on course for a short payback period of just 18 months. This is predominantly as a result of cycle times that have been cut by two-thirds in some instances, as well as reduced electrode requirements.

Advanced Tooling Systems UK Ltd was first incorporated in 2001, since when it has become a specialist in design, product development, prototyping and manufacturing for a number of demanding sectors. The company was formed by the amalgamation of two well-respected, Kent-based manufacturers: Millaber, based in Maidstone, and Folkestone Precision Engineering. Both companies, which remain at their respective facilities, served the automotive, white goods and medical industries for over 50 years before joining forces.

At Folkestone, ATS focuses on injection mould tools and precision engineering projects for a Europe-wide customer base. Core business of this ilk demands technologies such as EDM, and it is here that ATS UK recently sought to upgrade its die sink capabilities.

“We were witnessing an increase in demand for spark erosion work involving thin, deep ribs,” explains technical director Mark Terry. “For instance, we were recently awarded a repeat contract for a number of multi-impression two-shot wheel moulds. Traditionally, each impression required 45 hours of spark erosion and three electrodes. The target cost and lead-time for the package would not have allowed us to complete the project on-time and on-budget, so we began investigating new EDM technologies.”

Among three vendors invited to put forward a proposal was Sodi-Tech EDM, which recommended the Sodick AG60L CNC die-sink machine with optional 30-station tool changer.

“Sodi-Tech quoted some extremely impressive time savings on the wheel mould impressions and indicated that each impression could be completed in a third of the time using the Sodick AG60L,” says Terry. “In all honesty, we thought this was unlikely, so we offered up a core and an electrode and invited them to prove it. We went along to Sodi-Tech’s facility in Coventry to watch proceedings. Needless to say, they did it, and we placed the order for the machine on the way home. We knew that EDM technology had moved on, but not to that extent. It was an incredible eye-opener.”

Featuring linear motor drives and glass scale feedback on the X, Y and Z axes, the Sodick AG60L houses special circuits for electrode wear reduction, fine finishing and energy saving. Travels are 600 by 420 by 370 mm in X, Y and Z respectively.

Since the installation of the machine in March 2017, ATS UK confirms that EDM timings had been reduced by approximately 60%. Furthermore, less electrodes are required, thus delivering further savings.

“In reality, we experience almost zero electrode wear when using the AG60L, which is very impressive,” says Terry. “We found ourselves only swapping the electrode on this particular job simply because we’d made one, not because there was a real requirement.”
The graphite electrodes for the wheel tools were shaped like a wheel featuring a dozen spokes. Each spoke started at 1 mm at the root tapering with draft to 1.2 mm at the top and 62 mm in depth.

A further saving for ATS UK is the fact that two of its previous EDM machines have been replaced by the output of the Sodick AG60L. In fact, the Sodick machine has been paired with a 32-pallet automation device that allows the company to run lights-out overnight.

“The speed of the machine and its automation means we are on track for an 18-month ROI,” confirms Terry. “If we left our previous die-sink machine to run overnight it would finish at 4pm the next day – the Sodick finishes the same quantity of work by 4am. That’s a great result for ATS UK, which not only vindicates our investment decision but supports our business growth moving forwards. We are increasingly seeing mould tool work return from offshoring projects in China, particularly as the exchange rate means that tools from the Far East are now 20% more expensive than 12 months ago.”

This increase in work for UK mouldmakers means that ATS UK as a whole now employs 65 people and achieves turnover just shy of £8m, which is up an impressive 25% in the past five years alone.

“We have full CAD to production capability here, which is a major contributor to our growth, along with financial security that allows us to take on larger projects,” says Terry. “Clearly, investment in the latest manufacturing technologies, such as the Sodick AG60L, is another factor delivering genuine competitive advantage. For instance, some of our jobs demand tolerances as tight as 20 µm. The new machines provides us with the confidence to achieve this limit first time, whereas previously we would normally need two hits.”

Another significant benefit to the ISO9001-accredited company is the ease-of-use afforded by the Sodick control and its simple programming functionality.

“The biggest problem in our industry is finding fully-skilled toolmakers, who simply no longer exist,” says Terry. “As a result, we have been growing our own toolmakers by taking on two apprentices, every year, for the past eight years. Using our previous machine it would take up to six months to complete EDM training. However, with the Sodick machine we have already fully trained three employees in a fraction of that time.”
For further information www.sodi-techedm.co.uk

JC Precision Engineering earns 70% of its turnover from producing a range of components for racing go-carts. The business has grown progressively from the race track participation of the Munday family, led by father Vincent who set up the firm 36 years ago, and is now run on a day-to-day basis by his two sons Dan and Chris.
Production at the Market Overton factory in Rutland is steeped in CNC machining centres and fixed-head lathes for turning, into which around £1 million has been invested over the last five years, usually at a rate of one machine a year. However, around the family table, discussions have often broached the subject that perhaps the company should invest in CNC sliding-head technology for producing smaller precision parts.
“We used MACH 2016 as the final decider and ordered the Citizen Cincom L32-VIII with removable guide bush, which was installed in July 2016,” says director Dan Munday. “Almost immediately we wondered why we had debated so long. Indeed, such has been the success of the machine that we are now planning for a second because we are becoming increasingly concerned we could run out of capacity.”

Since July, apart from more effectively switching work from other machines, the firm has won new contracts that it could never have dreamed of fulfilling before. The directors have already noted how not only profitability has increased, but also throughput, with cycles being clocked two-thirds faster than before. For example one part taking more than 50 seconds on a fixed-head machine is now produced in
just 17 seconds.
However, most important to the company is that lead times are being decimated against previous methods, which involved separate fixed-head turning and often further milling and drilling set-ups, as well as manual finishing. Indeed, benefits are also being accrued from the ability to achieve total consistency, enabling ‘through-the-night’ running and the maintenance of tolerances as tight as 10 µm when needed.
As a result, previous production methods involving four or five set ups have been reduced to one, including in-cycle deburring. Batches as small as 20 have proven to be economical, especially when planned alongside other work, with the machine already either set with or without the guide bush in place or having no need for a bar change. This economic capability for small quantities has also encouraged design input for certain key customers, as well as development and providing a prototype service.

In ordering the Cincom L32-VIII, the company elected to specify the detachable guide bush.
“We have considerable demands for special sizes of short length parts, such as spacers and even washers, where we can save on bar end material,” says Munday. “It takes less than 30 minutes to change over to a guide bush when needed.”
One of the concerns holding back the venture into CNC sliding-head technology was the different approach to the application when compared with more traditional CNC turning.
“We had excellent support from Citizen, which quickly convinced us how our worries were totally unfounded,” says Munday. “What makes things easier is the Cincom control software, plus Citizen’s AlKart CNC wizard programming aid, which certainly helped us to get up to speed very quickly.”

He describes how the company is running a range of parts in materials such as EN24, 316 stainless steel, plastics, aluminium and brass. These include special bolts and pins, master cylinder brake pistons, brass fuel fittings and stub axles. Indeed, a further point of disbelief in the capability of sliding-head machining has also been dispelled in producing the stub axle from 31 mm diameter EN8. In a single cut of 7 mm, the part was taken down to 17 mm diameter and held to a 0.025 mm tolerance. The part was then threaded each end from the main and sub-spindle and, within the cycle, a hexagon was milled adjacent to a flange.
JC Precision Engineering, which employs 15 people, acquired its premises in 2000 with a floor area of 1000 sq m – the company is currently planning to add another building on the site. This will enable the firm to meet future demands and install a second Citizen, helping to increase turnover from the current £1 million.
“The whole business has always maintained a steady growth, and with the input into design, development and prototype activities, although this takes up valuable production time, it is paying massive dividends in customer loyalty and a longer term order book.”
The Cincom L32-VIII has five axes with a 40 tool capacity of which 15 can be driven. A maximum speed of 8000 rpm is available on the 7.5 kW main and 3.7 kW sub-spindle. Driven tools are powered by a 1 kW, 6000 rpm motor. Of major importance, which is proving to be a key factor in the firm’s applications, is the ease of removal or replacement of the guide bush assembly from the main spindle to accommodate the machining of greater numbers of shorter parts from a bar.
For further information
www.citizenmachinery.co.uk