Research method or a wet method in research, high-precision surface grinding

Regardless of the method or the wet-grind research method, plane precision grinding, grinder with a plate or the processing of the plane are convex, it is difficult to achieve the desired flatness requirements, the following reasons: (1) with flat  cutter wheels  machining plane, will bring the strength of the hand of a regular two parts mill flatness error increases, the plane was polished convex shape. (2) hand  grinding tool  heat transfer caused by the impact of convex result. There are two general ways grind, grind the workpiece in one hand is on grinding tools grinding, two hand-held grinding tool grinding workpieces. Both methods will almost t Cutting wheel  was ground directly to the outer edge of the workpiece, so that this part of the thermal expansion worn away, when the temperature returns to normal, irrigation, knife portion below the middle of the workpiece is ground, so the resulting convex shape.