Общий каталог Mitsubishi 2020 - 2021 - страница 710

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Threading Pitch (mm) Threading Pitch (thread/inch) Threading Pitch (mm) Threading Pitch (thread/inch) THREADING y SHIM REFERENCE GRAPH (Thread angle 30˚ and 29˚) Right Hand Thread Left Hand Thread %=4.5° %=3.5° % : Lead Angle % : Lead Angle %=2.5° Threading impossible %=1.5°(Standard Shim) Threading %=─ 1.5° impossible %=0.5° %=─ 0.5° (1.97") (3.94") (5.91") (7.87") (1.97") (3.94") (5.91") (7.87") Threading Diameter (mm) Threading Diameter (mm) Note 1) 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.) y Selection table Lead Opening angle 60°/55°AngleRight Hand ThreadOpening angle 60°/55° Left Hand Thread * Opening angle 30°/29°Right Hand ThreadOpening angle 30°/29° Left Hand Thread * 0 P05 P05 N05 N05 P05 P05 N05 N05 0.5 P05 P05 N05 N05 P05 P05 N05 N05 G 1 P15 P15 N15 N15 P15 P15 N15 N15 1.5 P15 P15 N15 N15 P15 P15 N15 N15 2 P25 P25 N15 N15 P25 P25 Not Available Not Available 2.5 P25 P25 Not Available Not Available P25 P25 Not Available Not Available 3 P35 P35 Not Available Not Available P35 P35 Not Available Not Available 3.5 P35 P35 Not Available Not Available P35 P35 Not Available Not Available 4 P45 P45 Not Available Not Available P45 P45 Not Available Not Available 4.5 P45 P45 Not Available Not Available P45 P45 Not Available Not Available 5 P45 P45 Not Available Not Available Not Available Not Available Not Available Not Available 5.5 Not Available Not Available Not Available Not Available Not Available Not Available Not Available Not Available * Back turning in the case of left hand threads. When replacing a shim, check if the difference between the y CALCULATION OF THREAD LEAD ANGLE thread lead angle and shim inclination angle is within: 2.5° ─ 0.5° where thread helix angle is 60° (55°) %: Lead angle 2°─ 1° where thread helix angle is 30° (29°)** Inclination The holder angle has a of a 1.5° standard shim lead angle. is 0°. tan% = I)d = nP)d I : Leadn : Number of threadsP : Pitchd : Effective diameter of thread y EXAMPLE OF SELECTING A SHIM y RELIEF ANGLE OF AN INSERT SET ON A HOLDER • When the thread lead angle is 2.2° Thread Helix Angle Internal Relief Angle External Relief Angle zIn the case when the thread helix angle is 60° 60° 8.8° 5.8° (2.2° lead angle) ─ (2.5─0.5°) = -0.3°─1.7° shim inclination angle is appropriate. 55° 7.9° 5.2° Threading with a standard shim (0° inclination angle) is possible. But, replacing with a shim with 30° 4.1° 2.7° a 1° inclination angle is recommended, refer to Standard Shim List on pages G021 and G026. 29° 4° 2.6° xIn the case when the thread helix angle is 30° • Relief angles ($2, $1) of an insert become small when (2.2° lead angle) ─ (2 ─ 1°) = -0.2° ─ 1.2° shim inclination angle is appropriate. the thread helix angle of a trapezoidal, round, or other Replacing with a shim with a 1° inclination angle is recommended, referring to thread is small. Take care when selecting a shim. Standard Shim List on pages G021 and G026. G013