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8.4.1 Pitch Diameters, Lead snd Lead Angle

Pitch diameter of worm = d_w = n_w P_cn                                  (40)
                                              p sin l 

Pitch diameter of wormgear = D_g = N_g P_cn                            (41)
                                                    p cos l

where:
         n_w = number of threads of worm
         L   = lead of worm = n_wp_c = n_w P_cn  
                                                     cos l
         l   = lead angle = tan^-1  n_w   
                                             P_dd_w
                                 = sin^-1  n_w P_cn  
                                                pd_w
         P_cn = P_c cos l  

8.4.2 Center Distance of Mesh
              c = d_w + D_g = P_cn [ N_g    +    n_w  ]                               (42)
                         2        2p   cos l    sin l

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