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USER GUIDE
      THREADING  Helix (Lead) angle area by using graph  φ(φL)  φ(φL)  φ(φL)                φ(φL)



           Helix angle evaluation

                  T.P.I
                                                        4°
                                                                    3°
                                                 5°
                                                                                            2°
                   2





                   3
                 Pitch / Lead [inch]  4                                                              φ(φL)

                                                                                                     1°


                  4.5
                   5

                   6
                   7
                   8
                   9
                  10
                11.5 11
                  12




                               5/8  3/4  1/8  1  1 1/8  1 1/4  1 3/8  1 1/2  1 5/8  1 3/4  2  2 1/4  2 1/2  2 3/4  3  3 1/4  3 1/2  3 3/4  4  4 1/4  4 1/2  4 3/4  5
                                                  Diameter [inch]


            Detailed view for small pitch/diameter

                                 T.P.I             φ(φL)  φ(φL)  φ(φL)    φ(φL)
                                  13               5°  4°    3°            2°
                                  14
                                  16

                                  18
                             Pitch / Lead [inch]  19                                    φ(φL)
                                                                                         1°
                                  20
                                  22
                               26  24
                               28  27
                                  32
                               36
                                  40
                               44  48
                               60  56
                               72  64
                                  80
                                       1/64  1/32  1/16  3/32  1/8  5/32  3/16  7/32  1/4  5/16  3/8  7/16  1/2  9/16  5/8  3/4
                                                           Diameter [inch]













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