Fast, versatile machine wins

Michael Phillips, joint owner with partner Wayne Robins of contract machining firm Atomic Precision, describes their recently purchased, Japanese-built Brother Speedio U500Xd1 as ‘a Swiss army knife of 5-axis machining centres.’ His comment is due to the 30-taper machine’s high quality, versatile functionality, compactness, and ability to complete an extensive range of jobs quickly and efficiently. Brother machines are sold and serviced in the UK and Ireland by Whitehouse Machine Tools, Kenilworth.
Founded in East Hendred, Oxfordshire, in 2020 by the two time-served mechanical engineering apprentices, who both previously worked in the machine shop at nearby Rutherford Appleton Laboratory’s space development facility, Atomic Precision specialises unsurprisingly in manufacturing components and assemblies for the space and scientific research sectors.
Over the next four years, a succession of 40-taper VMCs from another supplier arrived on the shop floor: three 3-axis models and two 5-axis machines. During that time, the subcontractor enjoyed an impressive growth rate of 50% yearly.

It was clear to the two partners, who work alone that the ongoing rate of growth was unsustainable without progression on the shop floor to more efficient machine tools and perhaps also automation to gain substantial periods of unattended production. They operate a single-day shift, and working longer hours is not part of their game plan.
As a first step to raising productivity, Whitehouse Machine Tools installed and commissioned the high-speed Brother U500Xd1 in September 2024. The partners learned of the machine at the Southern Manufacturing exhibition in Farnborough in early 2023. The order was placed after early hesitation regarding the smaller spindle interface, which later proved to be a non-issue and benchmarking a couple of other 30-taper machines on the market.
Mr Phillips commented: “The area taken up on our shop floor by the U500Xd1 is half of the space that one of our 40-taper 5-axis machines occupies, yet the 30-taper VMC produces larger parts. Not only that, but the Speedio finishes an identical component in two-thirds of the time, as the non-cutting elements of cycles are incredibly short, so tools are in-cut for typically 90% of the time during a cycle.”
“The linear axes accelerate at 2.2 g up to 56m/min, and chip-to-chip time is 1.3 seconds. Rotary positioning by the trunnion and table is similarly fast, and parts come off complete, resulting in rapid floor-to-floor times.”

The machine installed in East Hendred is a well-specified version of the Speedio model, with a 16,000rpm 15kW spindle, 28-position tool turret, high-pressure coolant, and Blum tool and part probing. Axis strokes are 500 by 400 by 300mm, but multi-face machining of components up to 500mm in diameter by 270mm high and weighing up to 100kg is possible owing to the layout of the machining area.
As well as producing parts up to the maximum working envelope, the Speedio also machines tiny components requiring complex features cut with a 0.2 mm diameter end mill, hence the decision to opt for the highest speed spindle Brother offers. Towers are extensively used for fixturing multiple smaller parts to extend the walk-away time from the machine if individual cycle times are short. Batch size is usually up to 10-off, although often single prototypes are machined.
However, in November 2024, Atomic Precision received a huge order from a new customer for 400-off aluminium brackets requiring a 3+2 machining strategy, using the rotary axes to position the part. The subcontractor could not have accepted the contract if it had been unable to use the elevated speed of the Brother machine. A 5-axis, 40-taper VMC would have been too slow to meet the three-week lead time, so the subcontractor would have had to turn down the work. If more jobs involving quantities of several hundred starts coming in, automating the Brother and other VMCs on-site will go ahead imminently.
The factory processes various materials, including aluminium, stainless steel, brass, copper, tungsten, and tantalum. Mr Phillips advises that it is possible to hold ± 10 micron dimensional tolerance ‘comfortably’ on the Speedio, even without climate control in the factory.