Superfinishing Process – What is it? Benefits and applications

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Posted on April 8, 2024 by

find out more about the Superfinishing process, benefits, applications and technology

In the realm of manufacturing and engineering, precision is paramount. From aerospace components to medical implants, the quality of surface finish can significantly impact performance, longevity, and efficiency. Enter the superfinishing process, a technique that takes precision to a whole new level.

What exactly is superfinishing, and how does it differ from traditional machining methods? Let's delve into the intricacies of this fascinating process.

Understanding Superfinishing

Superfinishing is a finishing process that aims to achieve an exceptionally smooth surface finish on a workpiece. Unlike conventional machining, which focuses primarily on shaping and rough finishing, superfinishing refines the surface texture to ultra-precise levels, often reducing roughness to mere microinches.


The Process in Action

At its core, superfinishing involves the use of specialised surface finishing machines and abrasive media to remove imperfections from the surface of a workpiece. These imperfections may include peaks, valleys, and irregularities left behind by previous machining operations.

The process typically begins with the preparation of the workpiece, ensuring it is clean and free of contaminants. Next, the workpiece is placed in a mass finishing machine, where it undergoes a series of rotational movements.

During superfinishing, abrasive stones, often coated with fine abrasive particles, are brought into contact with the workpiece surface under controlled pressure and speed. This gentle abrasion gradually smoothens the surface, resulting in a mirror-like finish characterized by uniform texture and minimal waviness.

Benefits of measuring vibratory amplitude

Key Benefits of Superfinishing Process

  1. Enhanced Performance: components subjected to superfinishing exhibit improved performance characteristics, such as reduced friction, increased wear resistance, and enhanced functionality.
  2. Tighter Tolerances: superfinishing allows for the attainment of precise dimensional tolerances, crucial in industries where even slight deviations can lead to performance issues or product failure.
  3. Extended Component Life: by eliminating surface imperfections that could act as stress concentration points, superfinishing helps extend the service life of components, promoting reliability and durability.
  4. Improved Efficiency: components with superfinished surfaces experience reduced friction and wear, resulting in smoother operation and higher efficiency, particularly in high-speed applications.

Applications Across Industries

The versatility of superfinishing makes it indispensable across various industries, including:

  • Automotive: superfinishing enhances the performance and longevity of engine components such as crankshafts, camshafts, and transmission gears.
  • Aerospace: critical aerospace components, including turbine blades, hydraulic pistons, and landing gear shafts, benefit from the precision and durability afforded by superfinishing.
  • Medical: surgical instruments, orthopedic implants, and prosthetic components rely on superfinishing for superior surface quality and biocompatibility.
  • Precision Engineering: superfinishing is integral to the production of precision bearings, shafts, and gears used in machinery and industrial equipment.

ActOn Range of Superfinishing Machines 

Imagine reducing the Ra value by 40% in just 15 minutes. What about increasing RFT (Right First Time) by 92%; reducing the TAT (Turnaround Time) by 30%; and improving your operating costs up to 25%. All of this is possible with our superfinishing technology, developed to meet the most demanding industries, such additive manufacturing, aerospace, automotive, medical and more.

ActOn Finishing is a pioneering force in the realm of surface finishing technologies, offering a comprehensive suite of solutions tailored to meet the most exacting demands of modern industries. Among our range of superfinishing technology you can find:

  • CHEF Technology: these machines and are equipped witha direct drive mechanism which generates high g-forces resulting in shorter processing times, 10 times faster than traditional finishing technology.
  • Centrifugal Disc Machines: perfect for processing small & thin components as well as larger parts with a length of up to 150mm. Can reduce process times by over 50%.
  • DLyte Dry Electropolishing: achieves high quality finishing for machined, sintered and casting parts, obtaining a mirror finish result. The polishing action reaches every corner of the piece, so it can process inner cavities which can not be accessed mechanically. You can expect ahomogeneous polishing across the entire surface of the piece.
  • Wet Blasting Cabinets: excel in removing contaminants, corrosion, and unwanted residues from a wide array of materials.Whether it’s restoring the luster of metal components or achieving a smooth, uniform finish on intricate surfaces, our wet blast machines deliver exceptional results.
  • Dry Blasting Cabinets: at ActOn we offer efficient and powerfuldry blasting cabinets, including pressure and suction blasting machines. We also offer an ECO version to minimise your investment while enjoying the benefits of a good quality shot blasting machine.


In the pursuit of perfection, the superfinishing process stands as a testament to human ingenuity and precision engineering. By refining surface finishes to unparalleled levels of smoothness and uniformity, superfinishing elevates the performance, reliability, and longevity of critical components across diverse industries.

To learn more about our superfinishing technology and our specialist support services,  get in touch with us, to start achieving great finishing results.

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