钳工在大型圆锥体展开料划线时，采用常规的划圆弧方法，不但要制作巨大的划规，而且操作起来，需要很大的场地，为此，本文向读者介绍一种求坐标点的作圆弧方法。设所需要的半径为R的圆弧AB已画好，如图1所示。建立坐标系，使Y轴通过AB的中点及其回心D点，X轴与AB相切。在AB上 Fitter in the large cone to start the dash, the use of conventional arc method, not only to make a huge zoning, and operation, requires a large venue, this article, the reader to introduce a coordinate point For arc method. Set the required radius of R arc AB has drawn, as shown in Figure 1. The establishment of coordinate system, so that the Y-axis through the midpoint of AB and its back to the heart D point, X and AB tangent. On the AB