英語(yǔ)翻譯
Multiple-edged tools can also be used.Drilling uses a twin-edged fluted tool for holes with depths up to 5 to 10 times the drill diameter.Whether the drill tyrns or the workpiece rotates,relative motion between the cutting edge and the workpiece is the important tactor.In milling operations a rotary cutter with a number of cutting edges engages the workpiece,which moves slowly with respect to the cytter.Plane or contoured surfaces may be prodyced.Depending on the geometry of the cutter and the type of feed.Horizontal or vertical axes of rotation may be ysed,and the feed of the workpiece may be in any of the three coorkinate direcions.