What filament size and shape?
Brush selection depends on the “aggressiveness” and “conformability” needed. Aggressiveness is controlled by grit size of the filament as well as the filament stiffness as it impacts the part surface. Conformability relates to how readily the filament bends or conforms to the geometry of a part’s surface. Brush conformability is needed to accommodate part contours. Smaller-diameter filaments offer more compliance and are required to reach burrs in tight areas with poor accessibility. However, they have less rigidity and therefore less aggression. Filament shapes available are round crimped, round straight, or rectangular. Rectangular filaments, having a larger cross section, are stiffer than round filaments and therefore more aggressive. Rectangular-filament brushes are used when brush conformability to parts is not an issue. A rectangular filament with 80-grit abrasive grains provides the most aggressive brushing. Applications on cast iron and steel normally require this type of filam
