For more than 30 years, Birmingham-based Rowan Precision has been manufacturing high-quality parts for customers – and for much of this time, the company has relied upon Guhring UK to supply its cutting tools.

As a subcontract machining specialist to industries such as the defence, medical and aerospace sectors, AS9100 and ISO9001-accredited Rowan specialises in sliding and fixed-head multi-axis turning, as well asfive-axis machining. With more than 10 sliding-head turning centres on the shop floor, the company has an enviable reputation for the medium-to-high volume lights-out manufacturing of small components. It is here that the service from Guhring plays a pivotal role.

Commenting upon the longstanding relationship with Guhring UK, Matthew Lowe, technical director at Rowan Precision, says: “We’ve had a good relationship with Guhring for many years and they supply us with high-quality tooling and excellent technical advice. When we need something they are here to have conversations and meetings about upcoming jobs, and we can talk about the processes with Guhring’s technical team. We cut anything from plastics up to titanium, the high EN numbers, iridium platinum and other challenging materials. Guhring will sit down with us, look at our drawings and give us what we require to do the job.”

Looking at specific tools, Lowe says: “We use a bit of everything. This ranges from Guhring’s Micro end mills, its Diver cutters, the RF Speed and a lot of the Ratio range of through-coolant drills. We also use their grooving tools and the micro-boring system. We have an entire range of products and they are all very easy to use. Importantly, we have confidence that when we run lights out, we know how long the tool is going to last. Every component and every drawing has a defined tolerance; we need to ensure that the tooling we use can work within that tolerance for a certain period of time. The Guhring products certainly provide that confidence, giving us the ability to run our machines lights out.”

With such a diverse selection of Guhring tools utilised at Rowan Precision, the company also makes use of the Guhring TM multi-vending machine to ensure the correct tool is always on hand for the multitude of components that the company manufactures.

Considering specific applications, Lowe says: “We recently needed tools for a particular job and Chris Bush from Guhring came in and spoke to us about the application, the material and the number of parts we would be running. From this, Chris came back the same afternoon with suggestions and tool data from Guhring. We moved forward and purchased these tools and they are working very successfully. This excellent level of service supports our aims to achieve optimal machining performance and tool life.”

Discussing the relationship with Rowan Precision from a Guhring perspective, Guhring UK sales managerChris Bush says: “We’ve had a strong relationship with Rowan Precision for many decades and, as soon as they have a new component, they’ll give us a call and we’ll come in and take a look at the component, the drawing and recommend the tools best suited to the application.

“Rowan Precision has a lot of sliding-head turning centres machining small components, so they purchase our Micro Precision line of tools,” he continues.“This encompasses everything from milling cutters to drills. We also supply a lot of Micro Diver tools and Micro Milling cutters, which are perfect for all the typically hard-to-machine materials at Rowan Precision. This can range from grade 5 titanium to 316 stainless steel and everything in between.”

Discussing the continually expanding range of micro-tools, Bush concludes: “We’ve taken the Diver milling cutter geometry and incorporated that into a Micro Diver, so we get all the benefits of the Diver range on a micro-end mill. This allows Rowan to apply small tools to their difficult-to-machine materials while holding very tight tolerances and drastically reducing cycle times. As a company that runs lights-out machining, Rowan needs secure processes. They need tools that they have complete confidence in. The Guhring range of Micro Diver tools enables Rowan to set the machines up at the end of the shift when they go home, and know the tools will perform through the night. When the staff return to work in the morning, they are guaranteed high-quality components.”
For further information www.guhring.co.uk

Founded only five years ago, PBE CNC has carved a name for itself as a specialist subcontractor in the five-axis machining of motorsport components. Evolving at pace, the Havant-based company relies upon hyperMILL CAM technology from Open Mind Technologies to deliver components of impeccable quality.

Even before company founder and managing director Jonathan Plumridge started the business, the entrepreneur had purchased a seat of hyperMILL to offer programming services to the subcontract manufacturing sector. Using hyperMILL as a freelance engineer provided Plumridgewith the means to start PBE CNC and buy his first machine, a Mazak i500 Variaxis. The company has since purchased a second i500, a Mazak VCN 430A machining centre with 4th axis and, most recently, a Mazak QT Compact 200L turn-mill centre.

“The work that we do here is primarily for the motorsport and food processing industries, machining components made of aluminium and titanium in anything from 1-offs to runs of 500+,” says Plumridge.“I chose hyperMILLhaving used it at a previous company and it has proven very reliable. The software is very good at importing models, thetool paths are generated very quickly on large parts and the five-axis parts are rock solid. Additionally, the simulation tools are excellent and you can always be sure that the tool path will run safely.”

Discussing ease-of-use, Plumridge adds: “After initial training, the system is very intuitive to use and all of the menus, whether it be for 2D, 3D or five-axis toolpaths, all run along the same theme, so once you know how to do one – they all follow on. The parts are very easy to set up when you follow the model.You can use the project assistant to set your datum and stock, which you can adjust if necessary. Then youcan choose the machine to which you wish to output before adding toolpaths quickly and easily.

“Since I started using hyperMILL, I’ve noticed that the toolpaths are high quality and very consistent, and you can customise them if needed to make them do exactly what you want,” he continues.“In the type of industry we work this is critical because the parts have to look aesthetically pleasing – and hyperMILL gives you all of the tools to do that.”

From time to time, Plumridge will also use hyperMILL to quote parts. Users can quickly import the model and put a few toolpaths on the job if unsure whether the part needs a lot of scanning. hyperMILL will provide an accurate estimation of how long the part will take to produce.

“We’ve recently taken delivery of a turn-millcentre and have a post-processor from Open Mind for that machine,” explains Plumridge.“It enables us to program around the C axis and this is not really any different to programming a normal machining centre. Users can just tell the system what post processor they are going to use, load the program and it runs. I would recommend that manufacturers talk to Open Mind if they are in the market for offline programming software as it’s easy to use and the support is excellent.”

Commenting upon the relationship between Open Mind and PBE CNC, Open Mindsales director Ken Baldwin says: “I’ve known Jonathan since he was at his previous company where he was using a different CAM system due to various reasons. Jonathan brought Open Mind in because they had an expensive machine crash. So, the first reason was safety and hyperMILL offers a lot more security in terms of collision checking and ensuring that the toolpaths created would be the right ones to give the best quality, but also be safe to run.”

He adds: “We’re finding more and more start-ups choose hyperMILL. It may cost more than alternative systems that are cheaper in the short term. However, when businesses have a vision of growing, they invest in hyperMILL from the start because they know that the software can grow with them, whether they move from simple three-axis machining to five-axis, mill-turn and even additive. hyperMILL will cater for everything a business needs within the machine shop, now and in the future.

“Using a CAM system like hyperMILL, there are several benefits you can achieve, although there may be different priorities depending on the nature of the machine shop. So, it could be that a company wants faster programming times or it may be in production where companies are producing thousands of components and they want to optimise the process. With a CAM system, you can visualise the stock condition at every stage and have an optimised tool path that can save those small percentages. When on a longer batch run, it can save a considerable amount of time.”

Manufacturers can also verify everything that is going on within the machine tool, so the tool, the holder and any kind of workpiece and workholding can be visualised in the machine so users can be sure that everything is 100% right before they start to run the machine, avoiding any costly prove-outs.

As a company that utilises a cobot for 24/7 lights-out production and Lang multi-point workholding for setting up multiple parts in a single set-up, this is certainly a casing point for PBE CNC.

Discussing automation, Baldwin says: “There is an automation package within hyperMILL that not many people are currently using. Some people do not understand thatautomation isn’t always a start-to-finish process, especially when factories undertake such a wide variety of work. Automation in hyperMILL is all about picking out sections. There may be a lot of components where you do the same process on a particular type of part and that may only be 15-=20% of the programming, if you can automate that and identify trends – it’s a 15 to 20% reduction in work which doesn’t have to be done every time. That is once again a huge saving on the programming time.”

He adds: “There’s already automation within hyperMILL that leverages the user’s knowledge, as customers know what works on certain types of components. We can integrate and customise these features to end user requirements. There’s also a lot more intelligence in tooling data and we’re working with various tooling companies to get more information on realcutting data and what works, and how we can get that information to applyautomatically. In the next few years, manufacturers will see a lot more progress in this area as the doors to automation open in quite a big way.”
For further information www.openmind-tech.com

A large proportion of work going through subcontractor C&M Precision’s Maldon factory involves machining copper that is bar-fed into CNC turn-mill lathes. Two sliding-head models out of the nine turning centres on the shop floor, all supplied by Citizen Machinery UK, have LFV (low-frequency vibration) functionality in the operating system of their Mitsubishi controls. This software results in much higher productivity and increased yield when converting malleable copper into high-end electronic components for OEMs in the medical, radar, satellite and broadcasting sectors.

Owner John Cable explains that for many of these jobs, a particular grade of copper known as OFHC (oxygen-free high conductivity) is required, which is more than 99% pure. One 60 mm long, tight-tolerance component previously produced from 3 mm diameter bar on an early Citizen Cincom M16 slider without LFV required turning in one pass through the guide bush down to 1.20 – 1.22 mm diameter along half its length. The continuous string of copper swarf frequently damaged the component and often became lodged in the counter spindle, preventing synchronous transfer after part-off and causing the machine to alarm out. The result was a severe impact on productivity and the scrapping of up to 20%of parts.

“Transferring the job to a Cincom L12-VIILFV we bought in 2019 was a real winner,” says Cable.“With the LFV function turned on, copper chips like brass. Yield is now 100%, throughput is high and we can even leave the machine to run unattended.”

The other Cincom slider on site with this chip-breaking functionality, a nominally 20 mm capacity L20-VIIILFV, arrived on the shop floor in 2017, making the subcontractor an early adopter of this novel technology. Supplied with a kit that allows feeding of oversize bar up to 25 mm diameter, the lathe is also proving useful for machining other materials that tend to generate stringy swarf, like nickel alloys and plastics, which the Maldon facility regularly turns.

C&M Precision began trading in 1992 as a CNC sliding-head, twin-spindle, turn-milling shop, following research at the time indicating that four-fifths of rotational parts produced in the UK were less than 25 mm in diameter. After starting out with a different brand of slider, Cable quickly changed to Cincoms, describing the transition as “a breath of fresh air”.

The first model to arrive in 2001 was a now discontinued M12, since sold on. The first job it tackled was the production of 120,000 brass connectors requiring the milling of 3/8-inch hex flats. Amazingly, due to the rigidity of the lathe that Cable described as “rock solid”, one 6 mm diameter carbide milling cutter completed all of the flats, 720,000 of them, and still had not worn out.

The subcontractor is an enthusiastic user of Cincom M-series machines due to their inclusion of a tool turret as well as a gang tool post, allowing the production of complex components. A 16 mm diameter bar model installed in 2004 was joined three years later by a pair of 32 mm diameter bar capacity lathes. The latter, third-generation M32 lathes have since been replaced by fifth-generation models to take advantage of Y-axis motion on the turret and an overall higher specification.

2014 and 2015 saw the arrival of three more 32 mm sliders, this time in the Cincom A-series. They have only gang tool posts, so are faster when manufacturing less complicated parts. One of the lathes does not have a guide bush, as it is devoted to relatively limited runs of short components such as mining industry connectors. The other two sliders with a guide bush produce tens of thousands of parts per week, 24/5. One example is a mild steel gas meter part which the customer orders at a rate of one million per year, with the subcontractor making weekly deliveries.

C&M Precision’s latest two acquisitions are from Citizen’s Miyano range of fixed-head lathes. Installed in January and March 2022 respectively, the twin-turret BNE-65MYY models with Y-axis motion on each tool carrier replaced two ageing lathes that had one Y-axis turret apiece.

“It made sense to go the Miyano route in view of our good experience with the Cincom lathes,” says Cable.“People say it is not good to have all your eggs in one basket, but in Citizen’s case it is. We now have a single point of contact for applications, back-up and service, and the supplier is very capable and responsive to our needs.”

He adds that the Miyano lathes have similar capability at both spindles and are highly productive, with advantage taken of Y-axis machining for a large proportion of the time. Simple off-centre holes are frequently drilled and bored, flats are easier to mill up to a shoulder, and roll marking often takes place using the Yaxes. Parts coming off the lathes are accurate due to one-hit production. It is possible to program cycles involving superimposed machining, where three tools are cutting simultaneously, although this facility has not seen use thus far.

Some parts are not possible at all on driven-tool lathes without Y-axis motion on at least one turret and would have to be put onto a machining centre for a second operation. Others, such as a pair of components – one aluminium and the other brass – for a broadcasting microphone, are produced much faster on the twin Y-axis Miyanos compared with the lathes they replaced. The company machines the more complex of the two, the aluminium part, in 4.5 minutes compared with 7.5 minutes previously. As the batch size is 2000-off, the saving is considerable.

As to the future, Cable sees continued purchase of LFV lathes inevitable. While high-pressure coolant systems break swarf adequately on his current larger lathes, as they mainly process free-cutting materials, there is one job presently produced from malleable, oversize, Swedish iron bar on the L20-VIIILFV that would profit from machining on a 32 mm Cincom in the same series with the chip-breaking technology.
For further information www.citizenmachinery.co.uk