Lmt Fette Axial Tread rolling system

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Axial thread rolling does its work by moving from the front (tailstock) of the part along the spindle centerline. In a single pass, three (up to six) rollers, synchronized by a planetary gear system, impart the desired OD thread shape, depth and pitch onto a workpiece. Generally, the rotation of the workpiece rotates the rollers. For CNC turning applications, a thread rolling head is usually placed in the tool turret.

The thread form on axial rolls consists of straight annular rings that are ground to the pitch of the thread to be produced. The rolls are positioned in the head at a skew angle that is approximate to the thread's helical (lead) angle.

Because of the skew angle, both sides of the rolls can be used. The skew angle also produces a forward motion, making the roller head self-feeding and self-opening. Because it traverses the workpiece, an axial head can produce threads that are longer than itself.

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