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H-THREAD 35-70 24/10/04 12:23 Page H60 USER GUIDE Flank Clearance and Effective Inclination Angle Inclination angle β of the cutting edges correspond to a specific thread helix angle λ and insures equal clearance angle on both sides of insert. Correct α L =α R λ Incorrect α L< α R λ β αL β=0 αR αL αR α - Flank clearance angle λ - Helix angle β - Effective inclination angle is achieved by selecting the suitable anvil Infeed Methods for Threading Operations Alternating Flanks infeed Radial Infeed Flank Infeed 1 2 H 3 4 5 Flank Equal Flank Diminishing Equal depth of cut for each pass Diminished depth of cut for each pass D1/2 H/2 D2/2 D1/2 D3/2 D2/2 Dn/2 D3/2 Dn/2 Dn+1/2 ∆D/2 U/2 ∆D/2 U/2 D1 = D2 = D3 = D n 2 2 2 2 H60 ISCAR H - Depth of thread profile (on ø) D - Depth of pass (on ø) U - Depth of finishing pass (on ø) D1 > D2 > D3 > D n > D n + 1 2 2 2 2 2
