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SELECTING A SHIM FOR THE MMT SERIES Lead Angle (%°)
y FLANK ANGLE AND LEAD ANGLE Inclination Angle ('°)
Lead angle ( % ) 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 ($1,$2). 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 Flank Angle ($2°) Flank Angle ($1°)
threads, change to a shim with a negative inclination angle.
y SHIM REFERENCE TABLE (THREADING DIAMETER)
Lead Right Hand Thread (mm) Left Hand Thread (mm)
Angle
Pitch Threading 4.5° 3.5° 2.5° 1.5° 0.5° Threading 1 .5° 0 .5°
(mm) impossible impossible
& 2.2 & 2.8 & 2.8 & 4.3 & 4.3 & 11.4 > & 11.4
0.5 < & 1.9 &1.9 & 2.2 & 3.2 & 4.3 & 4.3 & 6.5 &6.5 & 17.1 > & 11.4 < & 4.3 & 4.3 & 11.4 > & 17.1
0.75 < & 2.9 &2.9 & 3.2 & 4.3 & 5.7 & 5.7 & 8.7 & 8.7 & 22.8 > & 17.1 < & 6.5 &6.5 & 17.1 > & 22.8
1 < & 3.8 &3.8 & 4.3 & 5.4 & 7.1 & 7.1 & 10.9 & 10.9 & 28.5 > & 22.8 < & 8.7 & 8.7 & 22.8 > & 28.5
1.25 < & 4.8 &4.8 & 5.4 & 6.5 & 8.5 & 8.5 & 13.0 & 13.0 & 34.2 > & 28.5 < & 10.9 & 10.9 & 28.5 > & 34.2
1.5 < & 5.7 &5.7 & 6.5 & 7.6 & 9.9 & 9.9 & 15.2 & 15.2 & 39.9 > & 34.2 < & 13.0 & 13.0 & 34.2 > & 39.9
1.75 < & 6.7 &6.7 & 7.6 & 8.6 & 11.4 &11.4 & 17.4 & 17.4 & 45.6 > & 39.9 < & 15.2 & 15.2 & 39.9 > & 45.6
2 & 10.8 &14.2 &14.2 & 21.7 & 21.7 & 57.0 > & 57.0
2.5 < & 7.6 &7.6 & 8.6 & 13.0 & 17.0 &17.0 & 26.0 & 26.0 & 68.4 > & 45.6 < & 17.4 & 17.4 & 45.6 > & 68.4 THREADING
3 < & 9.5 & 9.5 & 10.8 & 15.1 & 19.9 &19.9 & 30.4 & 30.4 & 79.8 > & 57.0 < & 21.7 & 21.7 & 57.0 > & 79.8
3.5 < & 11.4 &11.4 &13.0 & 17.3 & 22.7 &22.7 & 34.7 & 34.7 & 91.2 > & 68.4 < & 26.0 & 26.0 & 68.4 > & 91.2
4 & 19.4 & 25.6 &25.6 & 39.1 & 39.1 & 102.6 > & 102.6
4.5 < & 13.3 &13.3 &15.1 & 21.6 & 28.4 &28.4 & 43.4 & 43.4 & 114.0 > & 79.8 < & 30.4 & 30.4 & 79.8 > & 114.0
5 < & 15.2 &15.2 &17.3 > & 91.2 < & 34.7 & 34.7 & 91.2
< & 17.1 &17.1 &19.4 > & 102.6 < & 39.1 & 39.1 & 102.6
< & 19.0 &19.0 &21.6 > & 114.0 < & 43.4 & 43.4 & 114.0
(Note) Back turning in the case of left hand threads.
y SHIM REFERENCE GRAPH
Right Hand Thread Left Hand Thread
%=4.5° %=3.5° % : Lead Angle 10 % : Lead Angle
%=2.5°
10 Threading Pitch (thread/inch) 9 Threading Pitch (thread/inch)
9 Threading 3 Threading Pitch (mm) 3
Threading Pitch (mm) 8 impossible %=1.5° (Standard Shim) 8 Threading %= 1.5°
%=0.5° 4 impossible %= 0.5° 4
7 5 7 5
6 6
6 7 6 7
10 10
5 5
14 14
4 18 4 18
24 24
3 32 3 32
2 2
1 1
0 50 100 150 200 0 50 100 150 200
Threading Diameter (mm) Threading Diameter (mm)
(Note) When a thread lead angle < the tool flank angle, change the shim to prevent sde interference with the insert.
(Refer to the table below for the calculation of thread lead angle and tool flank angle.)
When replacing a shim, check if the difference y CALCULATION OF THREAD LEAD ANGLE
between the thread lead angle and shim
inclination angle is within: tan % = I = nP % : Lead angle
2.5° 0.5° where thread helix angle is 60° (55°)
2° 1° where thread helix angle is 30° (29°) )d )d I : Lead
n : Number of threads
** Inclination angle of a standard shim is 0°. P : Pitch
The holder has a 1.5° lead angle. d : 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 G012 and G013. 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 G012 and G013.
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