Thread Cutting with a Rotating Tool

Thread Cutting with a Rotating Tool

Thread Cutting with a Rotating Tool - A highly efficient method of producing screw threads is cutting with rotating tools (the so called "whirling" method). It consists in the following: the workpiece rotates at a speed from 30 to 300 rpm (depending upon the workpiece material, diameter and pitch of the thread) and each of the single point tools, clamped in a tool head rotating at a speed from 1000 to 3000 rpm, makes intermittent contact (once during each revolution of the head) with the workpiece, cutting a thin chip. The tool head is mounted on a spindle located eccentrically in reference to the axis of the workpiece.

Principle of Thread Cutting with Rotating Tools

The tool head carries one, two or four tools. This method can be employed for cutting both external and internal thread of a diameter over 50 mm, second grade accuracy and with a surface finish of V 6. If the cutting tools are tipped with cemented carbide, the cutting speed may reach 400 m per min.