Blasting and Deburring

Macfab offers media blasting services, part tumbling ,and deburring as part of our one-stop solution. The CNC machining process can leave parts with burrs or sharp edges, chips, and tool marks. To ensure each part is produced to specification and ready to go directly to our customers’ production lines, blasting, tumbling, and deburring methods are applied. Macfab has the experts, equipment, and processes to provide optimal solutions to meet your requirements.

Media Blasting Services

Media blasting is used to improve the surface finish, or surface hardness, by shot peening the part. Two types of media blasting services are available. Macro blasting, commonly called sandblasting, is used on larger parts. Microblasting is used for smaller parts where the stream of abrasive is smaller and more precise. Both methods require the same ingredients: an abrasive media such as sand, prepared and pressurized to be propelled at an object.

Part Tumbling

Part tumbling is used to remove sharp edges and burrs to smooth the surface finish. These include conventional, magnetic and mass media tumbling. The benefits of part tumbling include a lowered cost, as large volumes of small parts can be processed more efficiently and uniformly than manual deburring with hand tools. Part tumbling also results in a consistent appearance and finish, removes burrs in cross holes, and internal cavities are cleared with no residue left on the part.

Process Specification for Media Blasting

As media blasting can achieve two separate outcomes, it is essential to outline on the drawing notes what the expectation of reference to a specification is.

Surface Hardness

Shot peening for designed surface hardness improvement. Peening is a cold working process that increases the surface hardness of a part. An Almen strip is commonly used to validate the process. This avoids costly destructive validation costs.

Surface Finish

If the surface finish is being improved, a Ra (roughness average) or other surface finish method is typically specified on a section or the full part. A Ra of 5 µ is the finest possible with a consistent 150 µ possible. Macfab can verify the finishes with a profilometer.

Macfab’s other operations include conventional, magnetic, and mass media deburring. More about these are below, highlighting their value to our customers.

Conventional Deburring

Burrs are traditionally removed by hand or with small tools such as a deburring tool or file. Macfab has specialized tooling for deburring parts that can be used in their CNC to reduce manual labour and achieve part consistency. This works well for a small number of parts. However, this process can take hours of intensive labour.

Magnetic Deburring

When machining small, non-ferrous precision parts, deburring may be necessary. Magnetic deburring removes burrs from the entirety of the part, including internal cavities, blind holes, cross holes, and threads.

This process, since it functions by way of a brushing motion of the small magnetic pins against the parts, also shines and polishes the parts. There is no residue left behind, nor any media left lodged inside the parts, so there is no need for an extra step to clean the batch of parts.

Tumble Deburring

This process is also known as vibratory deburring and works well for high-volume parts. It can used on an extensive range of materials. However, depending on the condition of the final part, it might need a secondary process to clean off the fluids used in the tumbler.

With many options available within these processes, Macfab’s experts will select the best one to achieve your desired result.