The movement is the heart of the watch, with the most sophisticated construction and the most sophisticated craftsmanship. A watch is good, polished from the above movement can be seen. "Geneva Seal Twelve Rules" on the provisions of the grinding on the occupied eight, through grinding can reduce the friction between the parts inside the movement, but also stable operation, of course, is also good for maintenance. Some top watch brands, such as Patek Philippe movement grinding is not limited to functional requirements, but also rose to the artistic level. The polished caliber runs more stable and reliable, while accuracy and service life are also improved. Watch movement of the grinding process include chamfering, linear grinding, round grinding three. Chamfer Chamfer is a mechanical engineering term used in the watchmaking, inlay and furniture carpentry industries. It is one of the most sophisticated finishing processes that takes time and requires the most sophisticated workmanship. Usually chamfering techniques used in the movement of the watch industry are to remove the edge between the surface and the side and form a 45 ° angle. By chamfering, the edges between the surface and the sides of some of the movement components are cut and polished, and these components reflect the glittering light after polishing. The chamfered surface must be neat and smooth, of equal width with the edges parallel to each other. This process is very particular, because the force is too large, the parts will be deformed, and the lack of strength will lead to the angle is not obvious, not clear. Chamfer points within the angle, the outer corner, round three, the inner corner is the perfect connection of the two edges, looks like the continuation of the same edge; outer corner of the outer edge of the two parts are connected, the corner must be sharp; Round rounded. Straight line polishing Linear grinding is the first step in the movement modification, it is an important process to determine the quality of chamfering. Side grinding First use a file and then matte on a motor with a diamond grind called "micro-cut" to draw one-way parallel lines along the sides of the part. Straight line polishing smooths the appearance of side surfaces by removing burrs and debris remaining on the side of the plate or bridge after machining. Round polished Circular grinding is also known as pearl round or fish scale circular grinding, the grinding is in accordance with appear on the movement of the shape to name. When sanding the grain of grain, the grooming union uses a plain-faced wood rod coated with a corundum paste or a polishing pad (1 to 3 mm in diameter) mounted on a rotating head and pressed against the bridge or Plywood surface and polished out the desired pattern. After finishing by hand, each dot must be perfectly parallel. Usually applied to hidden parts, such as the top plate and the substrate, usually we see the pattern on the substrate behind the balance wheel is the use of circular grinding process.