Mass Finishing

High Energy and Vibratory Finishing Solutions

Mass FinishingMass finishing is a process that can be used for a variety of reasons such as; burr removal, applying radius’s or giving a certain surface finish. The process of mass-finishing takes place in a variety of machines using various types of media and depending on the part requirements may run for minutes to hours.

This finishing process is typically applied when there are large numbers of parts that are processed frequently and on a regular basis. This method is best applied to parts that are not too big – they must fit into the machinery – and be able to withstand the processing itself. Industries that commonly utilize mass finishing include medical, defense, and advanced manufacturing.

Media Compounds

The various medias used can range from plastic, ceramic, as well as wood, corncob, and walnut shell products. The medias will most often contain some amount of abrasive agents such as; silicone carbide, aluminum oxide, or various other less known abrasives. The amount and type of abrasive along with the type of polymers used to bind it, such as plastic or ceramic, will greatly affect the cutting or material removal that occurs in the tumbling process.

The two effective processes that RPA use are high energy and vibratory. High energy is a process in which parts along with media, water, and a surfactant are placed in a barrel enclosed with a lid, this barrel is then rotated on a carousel that holds four barrels. Once the barrels are loaded and the machine is started the carousel will spin one direction as the barrels spin in the opposite direction creating great centrifugal force thus placing the desired finish on the part. Vibratory tumble will use a vibrating action of the media against the parts to create the desired finish. Both of these processes are referred to as mass finishing because so many parts can be done at one time.

State-of-the-Art Equipment

Pictured above is one of the four MFI high energy tumblers that RPA uses that features an 80-liter capacity. We also have two 120 liter capacity machines and a 12-liter machine. We use Mass Finishing Inc. machines as we find them to be very durable, well regarded in the industry and very dependable.

In addition to this equipment, we also have:

  • 5 Cu.Ft. Ultramatic tubs
  • 3 Cu.Ft. Ultramatic bowl
  • 4 Cu.Ft. Sweco bowl
  • 3 Cu.Ft. Sweco bowl
  • 10 Cu.Ft. Torx bowl
  • 2 Cu.Ft. Almco tub
  • 1 Cu.Ft. vibe bowl

Which machine gets used depends on the number and size of the parts; often times we will do media changes in machines as parts warrant. RPA will make an initial estimation of what media to use, run test parts, and then make adjustments if needed.

Contact us online to learn more!