Description of productsTechnical Information 22. Features of MC-Helical Thread Mills Cutting principles The edge of an MC-helical thread mill does not have lead, like a tap. To tap internal threads with an MC-helical thread mill, you need to use “helical interpolation” on an MC machine. Helical interpolation moves a tool in a helical manner using simultaneous 3-axis control. Right-hand or left-hand is determined by combining the vertical and horizontal moving directions of the shaft (X-axis) as shown in the figure below. The shaft itself rotates clockwise. 【Meanings of arrows】 Rotation direction of the tool Horizontal moving direction Vertical moving direction of the tool of the shaft Right hand thread Down-cut Up-cut (Climb) (Conventional) Left hand thread Down-cut Up-cut (Climb) (Conventional) Note : Basically, conventional milling is recommended due to excellent chip ejection. However, climb milling is recommended in the case of poor horse power and poor rigidity of the machine. Technical-72