(The surplus of notional finish machining of surplus of 1) finish machining is to show finish machining process is medium, the metallic layer ply that cuts. Normally the circumstance lays numerical control machine tool, finish machining surplus by finish machining cutting is finished. (Final to the treatment of the spare parts quality has the size of the surplus of influencing factor finish machining of surplus of 2) finish machining to be affected directly. The finish machining surplus that numerical control machine tool chooses cannot pass big, also cannot pass small, surplus crosses congress to increase cutting power, the generation of heat in metal cutting, affect treatment precision and treatment surface quality then; Surplus is too small indelible on line working procedure (or labor situation) blemish of all sorts of errors that leave, surface and the outfit of this working procedure place an error, create waste product easily. Numerical control machine tool because this, answer to decide finish machining surplus reasonably according to affecting the factor of mental allowance size. The factor that affects size of finish machining surplus basically has two: Go up namely working procedure (or labor situation) all sorts of surface blemish, sum of errors the error holding end of this working procedure. (The decides the method decides finish machining surplus method of surplus of 3) finish machining basically has the following 3 kinds: 1) experience estimation algorithm this law is the surplus of finish machining of practice experience estimation by technologist. Produce waste product to because surplus is insufficient,avoid, place appraise surplus slants commonly big, use at sheet only pre production. The data of the surplus of concerned finish machining that 2) checks a watch to amend a law to produce the plant practice and experiment research to accumulate makes form, and collection becomes manual. When numerical control machine tool decides finish machining surplus, can check so that what require data from inside manual, numerical control machine tool next the actual condition of recombine factory undertakes be correctioned appropriately. This kind of method uses numerical control machine tool at present the widest. When 3) analyses numeration to use this law to decide finish machining surplus, maneuver requiring use calculates formula and fair trial virtuous makings, undertake to affecting each factor of finish machining surplus integration analysis and consideration will decide surplus of its finish machining. The finish machining surplus that numerical control machine tool decides with this kind of method contrasts economy reasonable, but must have mix in the round quite reliable test data, current, be in only data is very valuable, and war industry is produced or minority is used in mass-produced factory. (When surplus of 4) finish machining decides this exemple to machine really, according to chooses cutting tool and workpiece material, the finish machining surplus that uses experience estimation algorithm to decide is 0. 25mm (diametical quantity is about 0.
5mm) . CNC Milling