What is different about the shape of the external turning tool and the inner circle tool?
The outside round knife is a common knife. The inside round knife is the head. The upstairs picture is correct.
Of course, the external turning tool is not the same as the inside. I have this "mechanical manufacturing process basic textbook" friend if need, add my QQ: 769940117: machine manufacturing process basic textbook
However, if the inner circle is large and the depth of the hole is reached into the hole with a knife stick, it will also be done with a common knife. I always feel that the internal round car knife is not rigid.
