Lay out plate, sheet steel or other heavy metal and mark bending and cutting lines on work piece using protractors, compasses and drawing instruments or templates.
铺设莱板，钢板或其他重金属，用量角器，圆规和绘图工具或模板在工件上标记弯曲和切割线。
After cutting, the cutting slag on the work piece should be cleaned.
切割后，工件上的割渣应清理干净。
The cutting modes and the engagement between the cutting edge and work-piece are studied and presented.
分析了球头铣刀的铣削模式和铣削中刀具—工件的干涉过程。
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