Reasonable choice of cutting parameters principle is roughing, mainly to increase productivity in general, but also should consider the economic and processing costs; semi-finishing and finishing, should be the premise of ensuring the quality of processing, taking into account the cutting efficiency, economy and processing costs. Specific values ​​should be based on the machine instructions, cutting the amount of manual and combined on experience.
⑴ cutting depth t. In the machine tool, workpiece and tool rigidity permitting, t is equal to the allowance, which is an effective measure to improve productivity. To ensure accuracy and surface roughness of parts, generally should be left a margin for finishing. CNC machine finishing allowance may be slightly smaller than the ordinary machine tools.
⑵ cutting width l. L generally proportional to the tool diameter d, and is inversely proportional to the depth of cut. Economical CNC machining, generally ranges from l: l = (0.6 ~ 0.9) d.
⑶ cutting speed v. V is also a measure to improve the productivity increase, but the relationship between v and tool life more closely. With the increase of v, the tool life sharp decline, so the choice depends on v tool life. In addition, the cutting and processing of materials have a great relationship, for example, when using the vertical milling cutter alloy steel 30crni2mova, v can be 8m / min or so; but with the same end mill for milling aluminum alloys, v optional 200m / min or more .

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