久久久久99精品三人片毛片_黑人无码在线视频_国产一区二区三区免费乱码_国产免费观看精品_中文字幕视频在线一区国产

In NC lathe processing, the determination of the processing route generally follows the following principles.
1 It should be able to guarantee the accuracy and surface roughness of the workpiece being processed.
Make the processing route the shortest, reduce the empty travel time and improve the processing efficiency.
3 Try to simplify the workload of numerical calculations and simplify the processing process.
For some reusable procedures, subroutines should be used.