| 摘要 |
PURPOSE:To make a tool infeedable to a work without fail, by shifting the tool obliquely in relation to the work when the tool is shifted apart to a cutting start point. CONSTITUTION:An angle theta, which is made between a straight line SL connecting an approaching spart point PA to a cutting start point Pi and a work plane WPL, and a distance dz in a vertical direction are given in advance. Then, a coordinate value of the approaching start point PA is calculated with the angle theta and the distance dz so as to cause a projection straight line SL' of the straight line SL to the work plane WPL to be accorded with a normal direction in the cutting start point Pi of an outer line curve OLC. After a tool TL is positioned to the approaching start point PA, the tool is shifted to the cutting start point Pi and then cutting is started. |
