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Mass finishing refers to the finishing procedure on numerous parts simultaneously. Finishing involves the deburing, polishing, smoothing, cleaning and separating of parts. The finishing method is carried out in a tumbling or vibratory machine, with finishing media, finishing compounds and the parts to be mass finished thrown in collectively.

Depending upon the nature of the parts that call for mass finishing, the finishing machine, finishing media and finishing compounds should be selected. In tumbling machines, parts can be tumbled with or without media. These machines are well suitable for aggressive cutting and producing glistening polishes; they are good for working on edges and rounded corners. Vibratory machines are appropriate for shaking parts and media at a elevated rate of speed; they are secure for use on frail parts and these machines supply very smooth finishes even in parts with holes and deep recesses. Natural media like corn cob media and walnut shell media are used when a soft abrasive outcome is vital. For heavier abrasive needs, man made media like plastic and ceramic media can be used.

When common deburring has to be completed, ceramic media is very effective. Hard ceramic media are used for light deburring and polishing. Softer ceramic media that have more abrasive ingredients are used when more rapidly cutting is needed. If frail parts are subjected to mass finishing, plastic media can be used to give very smooth finishes without much shine. Because plastic media are much lighter compared to ceramic media, they do not hurt fragile parts. It is imperative to use the right quantity of media for the volume of parts being finished so that the parts remain safe. Finishing compounds are used to enhance the efficiency of the finishing media being used and to improve finishing cycle times. Compounds could be alkaline or acidic; they are very effective in de-greasing and de-scaling and they also help in increasing cutting speeds.

Vibratory finishing machines are used in mass finishing of parts. They comprise of tubs called finishing or processing tubs that are vibrated at high speeds. The parts to be finished are put into the tub along with finishing media and when the tub vibrates, the parts and media graze against each other. This abrasive action produces the deburring of parts. The cutting action that happens in a vibratory system is precise and thorough. Compounds particularly suited for vibratory systems can be used to provide better performance.

The vibratory finishing machines run at high speeds and very short strokes. So, they are powerful; yet, because of the short strokes, they do not place any undue stress on the parts. They can therefore be safely used on large parts like wing spans and landing struts. The vibratory finishing machines effortlessly dislodge material from holes and recesses in parts like bores and can work very fragile parts without causing any damage. The vibratory machines can be automated very easily – a full automation can be done for a finishing process that is sequential in nature. It can also be used as part of a large batch finishing process.