在工作圖上,不但要註明零件各部尺寸的偏差,而且,零件表面的幾何形狀和表面相互位置的允許偏差,也需要加以註明。例如:圓柱形軸的表面可能加工成椭圓形,平面可能加工成波紋形狀。在工作圖上,這些偏差的表示,可以用文字在技術條件栏中註明(關於圖紙上的技術條件栏擬在下期介紹),也可以在零件表面允許偏差的部分用規定的偏差符號來表 On the work chart, not only to indicate the deviation of the size of the parts of the parts, and parts of the surface geometry and the mutual tolerance of the mutual position of the surface, also need to be noted. For example: Cylindrical shaft surface may be processed into an oval, the plane may be processed into a corrugated shape. On the work chart, these deviations can be indicated in the technical conditions column (to be introduced in the next section on the technical conditions of the drawings) or in the parts of the surface where the deviations are allowed, using the specified deviation symbols