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With over 50 years experience in the design and manufacture of Expanding Mandrels, we have developed the highest level of expertise.

More versatile and accurate than solid mandrels or similar workholding, Expanding Mandrels can be used during almost all machining and inspection procedures. They are frequently used during turning, milling, gear cutting, grinding, vertical boring, assembly and inspection operations.


  • Positive clamping and release
  • Fixed backstop for component location
  • Single tapers to ensure quick and secure clamping with maximum support
  • High levels of concentricity (to 0.005 T.I.R)
  • Interchangeable sleeves to cover a range of component sizes
  • Generous expansion capacities
  • Resistant to high levels of torque with minimum potential for component distortion
  • Suitable for robotic loading & link to existing machining mechanisms



“Chevin Tools has provided a variety of mandrels and we have been impressed with the quality of their products. We also chose them to supply collet chucks because they offer a full service from design through to manufacture.”

Andrew Cassie - Manufacturing Engineer


The Chevin Tools Workdriver is a Hydraulicaly operated Collet Chuck designed to hold Camshaft and Crankshaft components for high precision CNC grinding processes at high volumes. Developed as a standard item for the leading company in automotive grinding machines, the Chevin Tools Workdriver has become an industry staple in the automotive industry.

To support the use of our Workdriver we can offer the following;
• Large stock of spare parts and complete units
• Parts made to order - including Collet sleeves to your bespoke size requirment
• Refurbishment packages for used workdrivers
• A dedicated facilities for testing resistance to torque

Expanding mandrels availble with multiple sleeves to grip varying diameters independently


We pride ourselves on our ability to design and develop workholding solutions which overcome manufacturing challenges and increase productivity.

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Experience; Chevin Tools has over 60 years experience in designing and manufacturing Workholding equipment for use in varying industries

Design; our highly skilled in-house design team make effective use of industry standard 3D & 2D CAD software to streamline the design & approval process

Manufacture; we have a large and varied range of CNC Machines which include Multi Axis Milling Machines, Cylindrical Grinding Machines,Wire EDMs and Large Envelope Horizontal Borers

Quality; our team of Quality Engineers make use of the latest metrology equipment including a 1.5x1.3m bed CMM

Delivery; by keeping design and manufacture in-house we have tighter control over production lead times

Pricing; a focus on design for manufacture allows Chevin Tools to remain extremely competitive on price without compromising quality

Legacy; Chevin Tools boasts an award winning apprentice school which continues to train the next generations of engineers