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y SHIM REFERENCE GRAPH (Threadangle30˚and29˚)
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")
ThreadingDiameter(mm) ThreadingDiameter(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 Angle | Opening an Right Han | gle 60°/55° d Thread | Opening an Left Han | gle 60°/55° d Thread | Opening an Right Han | gle 30°/29° d Thread | Opening an Left Han | gle 30°/29° d Thread |
| 0 | P05 | P05 | N05 | N05 | P05 | P05 | N05 | N05 |
| 0.5 | P05 | P05 | N05 | N05 | P05 | P05 | N05 | N05 |
| 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 |
G
* Back turning in the case of left hand threads.
Whenreplacingashim,checkifthedifferencebetweenthe CALCULATION OF THREAD LEAD ANGLE
y
thread lead angle and shim inclination angle is within: 2.5°─0.5°wherethreadhelixangleis60°(55°) %: Lead angle
| 2°─1°wherethreadhelixangleis30°(29°) | I = | nP | I : Lead | |
| *Inclinationangleofastandardshimis0°. | tan% = | n: Number of threads |
)d )d *Theholderhasa1.5°leadangle. P: Pitch d: Effective diameter of thread y EXAMPLE OF SELECTING A SHIM y RELIEF ANGLE OF AN INSERT SET ON A HOLDER
| Thread Helix Angle | Internal Relief Angle | External Relief Angle |
| 60° | 8.8° | 5.8° |
| 55° | 7.9° | 5.2° |
| 30° | 4.1° | 2.7° |
| 29° | 4° | 2.6° |
xIn the case when the thread helix angle is 30° Relief angles ( , ) of an insert become small when
$2 $1 (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.