The overall thread milling cutter with chamfer function is similar in structure to the general one-piece thread milling cutter but has a special chamfering edge at the root of the cutting edge for machining the thread end chamfer while machining the thread. Machining chamfering in 3 ways, when the tool diameter is large enough, chamfer edge can be used directly out of chamfering, the method is limited to the processing of female thread chamfering. When the tool diameter is small, chamfering can be used to machine the chamfer by circular motion. However, the use of chamfer cutting edge chamfer cutting edge, pay attention to the thread cutting tool and the thread should have a certain gap, in order to avoid interference phenomenon. If the machined thread depth is less than the effective cutting length of the tool, the tool will not be able to achieve the chamfer function, so choose the tool should ensure that the effective cutting length and thread depth match each other.