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Lead angle (α) depends on a combination of thread diameter and pitch. Select a shim so that the lead angle of the thread can coincide with the flank angles of the thread and insert (β1、β2). No need to change a shim for general threading with an MMT holder. When threading with a small diameter or large pitch, change the shim depending on the lead angle, referring to the table and graph below. When threading left hand threads, change to a shim with a negative inclination angle.

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• Relief angles (β2, β1) of an insert become small when the thread helix angle of a trapezoidal, round, or other thread is small.Take care when selecting a shim.

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(Note) When a thread lead angle < the tool flank angle, change the shim to prevent side interference with the insert. (Refer to the table below for the calculation of thread lead angle and tool flank angle.)

2. In the case when the thread helix angle is 30° (2.2° lead angle) ─ (2─1°) = -0.2°─1.2° shim inclination angle is appropriate. Replacing with a shim with a 1° inclination angle is recommended.

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・When the thread lead angle is 2.2° 　1. In the case when the thread helix angle is 60° (2.2° lead angle) ─ (2.5─0.5°) = -0.3°─1.7° shim inclination angle is appropriate. Threading with a standard shim (0° inclination angle) is possible. But, replacing with a shim with a 1° inclination angle is recommended.

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(Note) When a thread lead angle < the tool flank angle, change the shim to prevent side interference with the insert. (Refer to the table below for the calculation of thread lead angle and tool flank angle.)