Каталог Iscar державки и пластины для нарезания резьбы 2022 - страница 82

THREADING USER GUIDE The anvil should be selected from the table according to the threading standard. The correct anvil depends on the right inclination angle (β) and insert size. The inclination angle (β) is obtained by selecting the thread turning method and finding the helix angle (φ) for single-start threading, or lead angle (φL) for the multi-start threading. The helix angle (φ) and the lead angle (φL) are determined as exact values by using the formula below or as a graph area (see below: Helix (Lead) angle area by using graph, depending on the threading diameter and lead. Helix angle (φ) calculation by using Lead angle (φL) calculation by using the the Single-Start Threading Formula Single-Start Threading Formula ( φ=arctan P π×Dpitch ) ( φL=arctan Lead π×Dpitch ) Lead= n×P When: When: φ = Helix angle φL = Lead angle Dpitch = Pitch diameter* Dpitch = Pitch diameter* * effective diameter of threading * effective diameter of threading P = Threading pitch P = Threading pitch π ≈ 3.142 n = number of threading starts π ≈ 3.142 Usable formulas Lead (inch)= 1 inchTPI ×No. of starts TPI = No. of threading per inch 1 inch = 25.4 mm Pitch (mm)= 25.4TPI 716 ISCAR