Threading tool. How to cut the thread correctly

The thread-cutting tool has several basic types.

Threaded tools and combs are a shaped tool used on metal cutting machines, can be rod, prismatic and round. It has simple design, versatility and manufacturability. It cuts the inner and outer threads on cylindrical and conical surfaces.

Taps are a threading tool used for cutting metal in pre-prepared holes for internal threads. It has the form of a hardened screw, which has cut grooves running along the rod and performing the function of cutting edges. There are manual and machine. For its manufacture, use a hard alloy or use high-speed steel.

Dies - a threading tool, in the form of a hardened nut, which has axial holes with cutting edges. The tool form is equipped with holes for chip removal. The cutting part of the tap is made in the form of an internal cone. The die can be made of alloy and high-speed steel, and it is also possible to make a hard alloy. It is intended for cutting of external thread and calibration on various kinds of parts.

Thread milling tools - a threading tool, which has several teeth (blades) for machine milling. There are cylindrical, end, worm, end and conical. They process wood, copper graphite, aluminum, cast iron, steel, hardened steel and stainless steel. The cutting part can be made of high-speed steel, cermet, hard alloy and diamond.

Thread cutting

The blank, which looks like a round rod with a diameter equal to the desired thread, is clamped in a vertical position in the vice. For a comfortable approach of the die, a small chamfer is removed with a nail file. The plate is fixed in the socket and put on the workpiece, well lubricated with engine oil. A small push on the plate begins to screw on the rod, trying to avoid distortions. Making a small number of revolutions in a clockwise direction, the plate is returned to its place, somewhere half a turn. And continue this way throughout the thread cutting process.

How to cut a tap thread

For this process, it is necessary to drill a hole and remove the chamfer for the correct tapping. With the help of the guide, the diameter of the hole is selected, starting from the desired pitch of the thread.

Each set of size has three types of tap, where each performs its function. The first is needed for the preliminary passage, the second is used to complete the process, and the third is used for finishing. The thread cutting process follows the same principle as the die. There is a repetition of several cycles back and forth with a lot of engine oil. When tapping blind holes, the tap is recommended to be turned out periodically to remove accumulated chips. Continue to a perceptible stop.