Thread Cutting Tool Geometry

Cutting tools used on a lathe are generally single pointed cutting tools and although the shape of the tool is changed for various applications.

Thread cutting tool geometry.

The most common setups are marked with green in the figure below. The leading edge of the tool bit that does the. Geometry is important and so is the quality of the carbide said halas. The entry angle of the cutting face into the workpiece material is measured in positive to negative degrees from a perpendicular reference line through the axis of the tool.

The tool is a forged type orbit type and held on a boring bar. Thread forming and thread rolling are processes for forming rather than cutting screw threads with the former referring to creating internal threads and the latter external threads in both of these processes threads are formed into a blank by pressing a shaped tool commonly called a thread rolling die against the blank in a process similar to knurling. The cutting face is the portion of the tap flute between the major and minor diameter of the thread that cuts or shears the workpiece material. The point of the tool must be set square with the work.

Working away from the chuck pull threading using right hand tools for left hand threads and vice versa enables cost savings through tool inventory reduction. 4 2 internal thread cutting tool. Carbide grade joins geometry in making an effective threading tool. Location in cartesian coordinates x 0 y 0 and z 0.

For the thread mill the cutting effectiveness comes from the grind edge prep and composition. Here s how the two types of hooks work. The complete tool is segmented into small axial i e. The thread turning tool can also be used in a normal or upside down position the latter helps to remove chips.

The bottom surface of the tool shank. It s a little different for an insert than a thread mill where you have to add a spiral flute. The same nomenclature applies to all cutting tools. Cylindrical milling tools and or radial i e.