Drilling cum tapping

These are semi automatic tapping machine i.e. the operator has to bring the tap towards the hole by manual action and once few threads are cut (1 to 2 nos) no further hand feed is required and the tap automatically advances towards the depth set and withdraw back successfully to home position.Tapping is the process of cutting threads on the inside surface of a drilled hole. This is achieved by using a special tool called a tap. Tapping a hole is necessary to develop the full strength of a connecting screw or bolt.Tapping tools are divided into four types: straight flute tap, spiral point tap, spiral fuse tap and forming tap. Which type you use depends on what type of hole you want to thread, blind hole or through hole, and the component material.