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Linishing is the process of using grinding or belt sanding techniques to improve the flatness, smoothness and uniformity of a surface and its finish. [ 1 ] [ 2 ] The process takes multiple stages, and a finer abrasive surface is typically used each time. [ 3 ]
The condition of the material at hand determines what type of abrasive will be applied. The first stage, if the material is unfinished, starts with a rough abrasive (perhaps 60 or 80 grit) and each subsequent stage uses a finer abrasive, such as 120, 180, 220/240, 320, 400 and higher grit abrasives, until the desired finish is achieved.
Sandpaper backings may be glued to the paper or form a separate support structure for moving sandpaper, such as used in sanding belts and discs. Stronger paper or backing increases the ease of sanding wood. The harder the backing material, the faster the sanding, the faster the wear of the paper and the rougher the sanded surface.
Abrasives generally rely upon a difference in hardness between the abrasive and the material being worked upon, the abrasive being the harder of the two substances. However, it is not strictly necessary, as any two solid materials that repeatedly rub against each other will tend to wear each other away; examples include, softer shoe soles wearing away wooden or stone steps over decades or ...
Can be used for surface sanding, edge sanding, stripping paint, cabinet doors, etc. Wide-belt sander: A large sander similar in concept to a planer, but much larger. Uses a large sanding belt head instead of a planer's shaping head, and requires air from a separate source to tension the belt. For rough sanding large surfaces or finishing.
In loose abrasive processes, there is no structure connecting the grains. They may be applied without lubrication as dry powder, or they may be mixed with a lubricant to form a slurry. Since the grains can move independently, they must be forced into the workpiece with another object like a polishing cloth or a lapping plate.