From Mass Finishing Handbook


Magnetic-abrasive finishing (designated by several acronyms including MAF and MAP for "magnetic-abrasive polishing") was originally introduced in Russia in 1938. It is defined as a process by which material is removed (deburring and surface finishing) in the presence of a magnetic field in the machining zone (Yamaguchi & Shinmura 1996). There are several variations of this process:

  • magnetic barrel tumbling

  • magnetic-abrasive vibratory finishing

  • magnetic-abrasive spindle finishing

  • magnetic-abrasive cylindrical finishing

  • magnetic-abrasive tube-ID finishing

  • magnetic-abrasive ball finishing

  • magnetic-abrasive special shape finishing

  • magnetic-abrasive prismatic finishing

  • mixed metal fixed magnetic finishing.

Table 20-1 describes some of the media used in the magnetic processes. Note that a variety of media have been used but some are limited to a single variation of the processes described in this chapter.

Table 20-1: Media used in magnetic-abrasive finishing





Magnetic-abrasive barrel finishing

304 stainless steel

Slightly magnetic

U.S. source: Pritic

Steel balls

Imahashi 2000

Ceramic coated ferrous chunk

Magnetic-abrasive cylindrical finishing

Diamond grains electrodeposited to cast iron balls

Shinmura, Takazawa, Hatano & Matsunaga 1990

Magnetic-abrasive tube finishing

Mixed media: WA magnetic abrasive (80 ?m mean diam., 20 wt%) and electrolytic iron particles (510 ?m mean diam., 80 wt%)

Yamaguchi & Shinmura 1998

Magnetic-abrasive prismatic finishing

Nb-C-Fe nuggets

Produced by plasma powder melting (65% Nb-C)

Anzai 2002

Iron powder plus Pikal metal polish lapping slurry

Anzai 2002

Granular (WA/diamond) or short fiber mixed

Kumakura et al. 1997

Iron powder + diamond...

Products & Services
Garnet, Emery, and Mineral Abrasives
Garnet, emery and mineral abrasives include mined grains such as pumice, carborundum, natural diamond, tripoli, rouge, staurolite, novaculite, silica and other silicate minerals.
Abrasive Grain and Finishing Media
Abrasive grain and finishing media includes crushed grit, metal shot, glass beads or shaped chips for blasting, mass finishing (vibratory or tumbling), bonded wheels, coated abrasives, ball milling, water jet cutting, and other applications.
Surface Preparation Services
Surface preparation services clean, strengthen and prepare surfaces for additional processing and/or refine or roughen surfaces to meet finishing requirements.
Mass Finishing Media
Mass finishing media is used to debur, burnish, color, de-scale, polish or clean during finishing processes.
Abrasive Compounds and Abrasive Slurries
Abrasive compounds and abrasive slurries are used to improve surface finish or flatness. They often consist of fine abrasives in slurry, bar, powder or paste forms.

Topics of Interest

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