A CNC milling machine precisely cutting or shaping a large metal gear with helical teeth, in an industrial workshop setting.

Gear Tooth Rounding

At Llewellin’s Gears we specialise in precision tooth rounding for gears, sprockets, and custom toothed components. Tooth rounding enhances performance, reduces stress concentrations, and improves meshing in high-load and high-speed applications. We support a range of gear types, including spur gears, helical gears, and sprockets.

Close-up view of interlocking metal gears in a mechanical system, showing the teeth and circular shapes in a monochrome blue tone.

Materials

Alloy Steels
Stainless Steels
Aluminium, Brass & Bronze

Methods

Machined Gear Tooth Rounding.
Chamfering, Deburring & Tip Radius Finishing.
Custom Setups for Low to Medium Volume Production.

Applications

Automotive Transmission Gears
Aerospace Gearsets
Conveyor Sprockets
Precision Motion Components

Quality Assurance

Tooth rounding is performed under strict quality controls using precision measuring tools and documented procedures, in line with our ISO 9001:2015 certified quality management system.

Close-up of a metal gear being machined on a CNC lathe, showing the cutting tool shaping the gear’s teeth and the shiny surface of the rotating metal part.

Other Capabilities

Broaching

Llewellin’s Machine Company Ltd excels in broaching, a precise machining process used to cut complex profiles, keyways and splines in gears and components. Our state-of-the-art horizontal and vertical broaching machines adhere to ISO 9001 standards, ensuring tight tolerances and exceptional finish quality.

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Gear Cutting

Established in 1883, Llewellin’s has been at the forefront of Britain’s gear manufacturing industry for over a century.

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Gear Grinding

Llewellin’s specialises in precision gear grinding, a vital process in the manufacture and finishing of gears for optimal performance.

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Gearbox Refurbishment

At Llewellin’s, we pride ourselves on being a leader in the design, manufacture, and refurbishment of precision gears, gearboxes, and transmission systems.

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Grinding

Llewellin’s Machine Company Ltd offers advanced grinding capabilities using state-of-the-art equipment and techniques. Our precision engineers guarantee all work adheres to stringent industry standards such as ISO 9001 and AS9100, delivering exceptional accuracy and surface finishes for diverse applications. Encompassing surface grinding, cylindrical grinding and centreless grinding, said capabilities are carefully optimised to achieve micron-level tolerances (±0.001 mm) and impeccable finishes. We also offer gear grinding, which you can learn about on its own dedicated page.

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Crane Winch Refurbishment

At Llewellin’s, we combine over a century of expertise in the design, manufacture, and maintenance of offshore winches and gearboxes.

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Reverse Engineering

Llewellin’s reverse engineering capability empowers clients to replicate and enhance legacy components, particularly when original designs or tooling are unavailable. Using advanced metrology equipment, including coordinate measuring machines (CMMs) compliant with ISO 10360-2 standards, we create precise 3D models of existing components.

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Slotting

Llewellin’s slotting capabilities enable precision machining for internal keyways, grooves and slots in gears, pulleys and other critical components. Using high-precision vertical slotting machines, we meet tight tolerances in compliance with BS ISO 286 standards.

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Spline Cutting

Llewellin’s are proud to have become recognised as leaders in precision spline cutting and gear manufacturing since first forming back in 1883.

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Turning & Milling

Our turning and milling capabilities allow us to produce high-precision components for UK clients positioned across a diverse range of sectors, including defence, aerospace and mining.

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Wire Erosion

Llewellin’s Machine Company Ltd is highly proficient in the science of wire erosion, a capability offering unparalleled precision in machining intricate geometries and fine tolerances.

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A vintage yellow and black open-top car with tufted black leather seats, brass headlamps, and large spoked wheels, displayed indoors among other classic vehicles.

Provide a first class service from a long standing professional company run by experienced and proper people. Many thanks for the parts remade for my vintage Peugeot Bebe.