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1、Unit 12 Tool Radius Compensation,12.1 Introduction,Vocabulary,tool radius compensation 刀具半径补偿 appropriate E5prEupriit adj. 适当的 awareness E5wZEnis n. 知道, 晓得 limitation 7limi5teiFEn n. 限制, 局限性,12.2 What is Tool Radius Compensation?,Simple tool radius compensation on a work piece containing parallel an
2、d perpendicular lines and full-quadrant arcs.（一个包含水平和垂直线以及全象限圆弧工件的简单的刀具半径补偿。） Figure 12.1,Vocabulary,accommodate E5kCmEdeit vt. 调节 tool nose radius compensation 刀尖圆弧半径补偿 perpendicular 7pE:pEn5dikjulE adj. 垂直的, 正交的 n. 垂线 full-quadrant 5ful5kwCdrEnt adj. 占满整个象限的，全象限的 straightforward streit5fC:wEd adj.
3、 简单的,直接了当的 trigonometry triE5nCmitri n. 三角法 circumstance 5sE:kEmstEns n. 环境, 详情, 境况,Notes,1Tool radius compensation is the act of accommodating for the cutting tool radius in order to produce the work piece of the correct geometry. 刀具半径补偿是一种调节刀具半径的行为，其目的是使加工出来的工件具有正确的几何形状。accommodate在这里是调节的意思，而不是我们熟
4、悉的提供住宿、容纳的意思。,2Most controls will also allow automatic tool radius compensation, which, under the proper circumstances, can save us some programming time and make it easy to adjust the toolpath. 大多数控制器都提供自动刀具半径补偿，在适当的情况下，这种方法节约编程时间，调整刀具路径的工作也会得到简化。,12.3 Reference Locations,Several calculations may b
5、e needed to find the cutter location when a line intersects an arc.（当直线与圆弧相交时，需要多次计算才能找到刀具的位置。） Figure 12.2,Reference points can be found by creating and then solving a triangle on the work piece.（为了找到参考点，可以在工件上建立一个三角形并对其进行求解。） Figure 12.3,Lines can be extended to form an apparent intersection. This
6、 intersection can serve as a reference point for other calculations.（可以将直线延长从而形成一个明确的交点。这个交点就可以作为其他计算的参考点。） Figure 12.4,Vocabulary,primary 5praimEri adj. 第一位的, 主要的 objective Eb5dVektiv n. 目标, 目的 finished 5finiFt adj. 完成的, 完结的, 完美的, 精巧的 measure 5meVE vt. 测量 intersection 7intE(:)5sekFEn n. 交点 transiti
7、on trAn5ziVEn, -5siFEn n. 转变, 转换, 跃迁, 过渡, 变调,in relation to 关于, 涉及, 与相比 reiterate ri:5itEreit vt. 反复地说, 重申, 重做 apparent E5pArEnt adj. 显然的, 外观上的 tangent 5tAndVEnt adj. 接触的, 切线的, 相切的, 离题的 n. 切线, 数正切 blueprint 5blu:7print n. 蓝图, 设计图, 计划 vt. 制成蓝图, 计划 confront kEn5frQnt vt. 使面临, 对抗 contend kEn5tend v. 斗争
8、, 竞争, 主张 contend with 对付,Notes,1The primary objective of NC programming is to find the locations on a Cartesian coordinate system that can be used to program a toolpath and therefore produce a finished work piece. 数控编程的首要目标就是要找到那些可用于编写刀具路径的笛卡尔坐标系上的位置，从而加工出完美的工件。,2The first step in this process is to
9、 find a reference point from which we can measure intersections or geometry transitions that define the shape of the work piece.,这个过程的第一步就是找到基准点，这样我们就可以确定定义工件形状的各个交点以及几何形状的转接点。 from which 后引导的从句为定语从句修饰reference point。,3The second step will be to find the relative coordinates of any intersections fro
10、m this reference point. 第二步是寻找所有交点相对于基准点的坐标。 此处relative coordinates of from 表示相对于的坐标。,4Finally, we can determine the center point of the cutting tool in relation to the intersectionsthese will be the coordinates that we use to write the part program. 最后，我们就可以确定刀心相对于交点的位置，其坐标正是我们编写工件程序时要使用的。,12.4 Too
11、l Location on Angular Toolpaths,A work piece with one angular feature requires the tool be positioned tangent to the feature to be machined.（工件有一个斜边，这就要求刀具被定位在与要加工的斜边相切的位置上。） Figure 12.5,a magnified view of corners a and b. The center of the tool can be found by setting the cutter tangent to the edg
12、es and solving the resulting triangle.（a和b的放大图。刀具中心可以通过使刀具与相应的边相切并解对应的三角形得到。） Figure 12.6,Vocabulary,visual 5vizjuEl adj. 看的, 视觉的, 形象的, 栩栩如生的 magnify 5mAnifai vt. 放大, 扩大 bisect bai5sekt v. 切成两分, 对(截)开 nugget 5nQit n. 天然金块 vertex 5vE:teks n. 顶点, 最高点,Notes,1Toolpaths along angular lines can be a chall
13、enge to solve. However, if we use a visual approach and remember a few rules of geometry, the calculations will be much easier. 求解有角度的直线上的刀具路径具有一定的挑战性。然而，如果我们采用直观的方法，并且记住几条几何规则，计算就会变得简单得多。,2The basic idea behind manual tool radius compensation is to find the point where the tool will be tangent to t
14、he lines we wish to machine. 手工刀具半径补偿的基本思想是，寻找刀具与将要加工的直线间的切点。,3Upon closer inspection we can see that the centerline of the tool must travel slightly past the corner to A point where it will be in position to cut the next line with the proper compensation.,仔细研究一下我们会发现，为了能够以正确的补偿加工下一条直线，刀具的中心线必须稍稍超越工
15、件角点并定位在A点。其中： where it will be in position to cut the next line with the proper compensation.是定语从句修饰point。,4Create a triangle by drawing a line from the corner of the work piece to the center of the circle, and then draw a perpendicular line from the center to the vertical line. 从工件的角点到圆心画一条线，再从圆心画一
16、条垂直于竖直线的直线，从而构成一个三角形。,5These two nuggets of information will allow us to create and solve a triangle to find the relative distance from the vertex to the arc center. 这两条定律能够帮我们构建并解析三角形，从而找到从顶点到圆心的有关距离。,12.5 Tool Location on Radial Toolpaths,The geometric relationships between two tangent arcs. A line drawn between the centers of the arcs will be perpendicular to their shared line of tangency.（两相切圆弧间的
