Toolsetting and installing of coordinate system of workpieces are important tasks while machining numerically controlled machines.

数控机床加工时,对刀及工件坐标系的设定是一项重要工作。

The optimeter is widely used to precisely measure external size of workpiece by comparison with a gauge block or standard part.

本仪器是一般是用标准器（如块）以比较法工件的尺寸。

The system uses PLC procedure control, start-up, forward or backward soldering gun, arc starting, workpiece circumgyration, etc full welding process all can complete automatically.

系采用PLC程序控制，、退枪、引弧、工件旋转等焊接全过程均能自完成。

Material removal by machining involves interaction of five elements: the cutting tool, the toolholding and guiding device, the workholder, the workpiece, and the machine.

材料的切削与5个因素有关：刀具，刀具的夹具和导向装置，工件的夹具，工件和加工机器。

In this paper,the mechanism of workpiece burn during grinding of casehardened steel and titanium alloys was studied by the use of SEM,EPMA,XPS and the metallograph analysis.

本文应用SEM,EPMA、XPS及金相显微分析等技术研究了表面硬化钢和钛合金的烧伤机理。