Advanced high-volume machining of aircraft brake clips

Founded in 1998 as a spin-off from gunmaker Westley Richards, Westley Engineering has evolved far beyond its origins. While only 5% of its output now relates to gun components, the company has established itself as a trusted supplier of machined components and assemblies to multiple sectors that include aerospace, automotive, rail, white goods and renewable energy. Today, this effort is underpinned by the recent addition of two Brother Speedio 30-taper CNC machining centres from Whitehouse Machine Tools.

Aerospace is Westley Engineering’s largest market, accounting for 45% of total production by value. A notable aerospace contract involves the manufacture of rotor clips used in aircraft disc brakes. Made from aerospace-grade steel and Inconel, the components see application in both civil and military aerospace programmes. Demand for the clips has risen significantly over the past few years.

Three years ago, Westley Engineering improved the accuracy of the manufacturing process by switching from piercing holes in the clip using press tools to drilling them on a 40-taper vertical machining centre. Although it improved precision, the new approach also increased cycle times substantially and made the process more labour intensive. So in late 2023, the company installed a Brother Speedio S700Xd1 4-axis, 30-taper machining centre, followed by a second in April 2025. Supplied by Whitehouse Machine Tools, the exclusive UK and Ireland distributor for the Japanese manufacturer, these high-speed machines have now replaced the VMC for clip production.

John Harland, Managing Director of Westley Engineering, says: “The arrival of the first Brother machine was a game-changer. Its exceptional speed, especially the 0.7-second tool changes, means each Speedio can machine clips 35-40% faster than with our previous set up. The former VMC ran around the clock on weekdays and through the weekend. Our new Speedios not only handle the entire production volume more efficiently, they also offer extra capacity for future growth.”

In partnership with Whitehouse Machine Tools, Westley Engineering implemented an automated, single-operation process on each Speedio. The new production route features custom-built fixtures with nine inclined bars, each capable of holding 36 clips. This high-density arrangement enables over 300 parts to be machined per cycle, significantly more than the flat fixtures used previously.

Cycle times have been reduced to between two and three minutes per clip, depending on the variant. For example, the Inconel version requires additional milling on the outer arms, whereas the steel variants do not. Typical batch size ranges from 5,000 to 10,000 units.

Before deployment, the process was validated at Whitehouse Machine Tools’ Kenilworth technical centre. Its applications engineers wrote the machine programs, assisted with fixture set up and provided on-site training, all offered as part of the supplier’s lifetime service and support.

A coolant-actuated gripper, housed in one of the Speedio’s 28 turret positions, picks each clip from the inclined bars. After verifying the workpiece position using sensors, the gripper transfers the part to a Schunk hydraulic vice mounted on a rotary axis. The component is then machined – drilled, countersunk and in some cases milled – before being dropped into a container for post-processing. All clips undergo 100% inspection (including after heat treatment), followed by fettling as needed to correct any distortion.

Notes John Harland: “Scrap has dropped to under 1%, down from up to 4% with the old process. And thanks to the energy efficiency of the Brother machines, we’ve cut power consumption by an estimated 60%.”