Surface Finishing

Tumbling

Through roller grinding, detailed burrs on CNC parts can be removed with the help of roller grinding media of different materials. Tumble grinding is a logical and time-saving method compared to deburring every detail by hand or CNC machine. The tumbling process has a relatively low impact on the environment as it is a closed process that produces only a small amount of residual product, which is disposed of in an environmentally friendly manner by a contracted waste management company.

What is Tumbling?

Tumbling finish is a process to remove the sharp edges,burrs and make the smooth surface for metal and plastic parts.There are two types for tumbling finish: Vibratory Tumbling and high energy tumbling finish.
The tumble or barrel finishing process provides an action comparable to rocks tumbling down a steep hill. The parts are placed in a barrel along with water, abrasive media and the proper compounding agent. The rotation of the barrel causes the media mass and parts to tumble down upon itself causing friction and thereby abrading the parts in the mass. This produces a cutting action that results in a fast, efficient deburring of the part’s surfaces.

Key Features

Applicable MaterialsColorsTextureCan be applied with
Aluminum, Steel, Stainless Steeln/aSlightly rounded edges, smooth, slightly matte finish, does not hide all machine marksAny finish

About the Process

Tumbling is a finishing process that is used to clean, deburr, and slightly smooth smaller parts. Tumbling uses a horizontal drum where parts are placed, along with a media, such as sand or ceramic chips. The drum rotates slowly, causing the media to slide repeatedly over the parts, breaking any sharp edges and lightly smoothing the surface. Tumbling is fairly inexpensive due to the small amount of manual labor involved to run the process.

What are the benefits of tumbling finishing?

Tumbling finishing each have their specific benefits but some of the general advantages include:

  • Mass finishing can produce a smoother surface when compared with manual deburring and finishing.
  • A variety of finishes can be achieved by altering the size, shape and composition of the media. This process is also suitable for a range of different metals for ultimate flexibility.
  • Tumbling finishing can achieve more uniform results than manual deburring and polishing techniques.
  • Mass finishing delivers the desired results much faster than manual methods.
  • Tumbling finishing are more economical than hand finishing, which can be a very labour-intensive process.

Design considerations

  • Because parts cannot be masked prior to tumbling, consider adding features such as threads and engravings after this process.
  • Tumbling is a rough process, so parts with thin features are not ideal for this finishing option.

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