Close-up of a metal gear being machined, with blue and orange coolant hoses directing fluid onto the gear’s shiny, angular teeth. The background is blurred, emphasizing the precision of the industrial process.

Gear Grinding

At Llewellin’s Gears, we deliver high-precision gear grinding services for applications that demand exceptional accuracy, surface finish, and quiet operation. Whether you’re in aerospace, robotics, or heavy industry, we support your requirements with gear grinding solutions that ensure smooth transmission, tight tolerances, and extended gear life.

A close-up of an industrial CNC machine grinding a large metal gear with sharp angled teeth. Blue coolant tubes and orange guards surround the rotating gear on the workbench.

Gear Grinding Capabilities

Helical
Spur
Wormshafts

Materials

Case-Hardened Steels
Nitride Steels
Tool Steels
Other heat-treated materials

Capacity

Max Gear Diameter: Up to Ø800mm
Max Gear Face Width: Up to 165mm
Module Gear Range: 0.5 to 10 Mod
Max Worm Diameter: Up to Ø300mm
Max Worm Length: Up to 915mm
Module Worm Range: 85 to 20 Mod

Applications

High-Precision Gearboxes
Automotive Transmission Systems
Aerospace & Defence Mechanisms
Robotics & Automation Equipment
Medical & Precision Instruments
Wind Turbines & Power Equipment

A close-up of a gear shaft being ground by a rotating abrasive wheel, with bright orange sparks flying from the point of contact.

Benefits

Consistently Tight Tolerances & Exceptional Surface Finishes.
Enhanced Wear Resistance & Gear Efficiency.
Quiet Operation, Ideal for Noise-Sensitive Environments.
Fully Integrated Grinding of External Profiles.
Certified Quality Backed by ISO 9001:2015.

Close-up view of interlocking metal gears with shiny, precisely machined teeth, highlighted by cool blue lighting.

Quality Assurance

Our gear grinding services are backed by a rigorous ISO 9001:2015 quality system. Every gear is inspected using gear measuring centres, precision gauges, and detailed dimensional checks to ensure compliance with exacting specification.

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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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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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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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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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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Tooth Rounding

Llewellin’s tooth rounding capabilities ensure gears meet stringent performance and durability standards, the kinds required in industries such as aerospace, rail and renewable energy.

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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.