Режущие и зажимные инструменты Hoffmann Group 2026 - страница 860

GBP 57 Determination of the necessary inclination angle The insert inclination angle α must correspond with the thread pitch angle β as exactly as possible. Only by this means can maximum profile accuracy and best surface quality be achieved. At the same time the evenness of the wear increases the working life of the insert. β Three important factors for the shim: Setting the correct inclination angle. Threading insert Shim with incorrect inclination angle. Pitch angle β Thread pitch P Protection for the insert seat. Nominal ⌀ D Threading insert Support for the cutting edge. Shim with correct inclination angle. Determination of the necessary inclination angle using the formula Metric: Inch: Example: Result: Thread pitch P = 2 The suitable shim has a 1.5° inclination. α ≈ 20×P α≈ 508 α ≈ 20×2 = 1.33° D D×threads per Nominal ⌀ D = 30 mm 30 Machining can be performed using the standard shim. inch Determination of the necessary inclination angle using the diagram also applies when overhead toolholders are used Necessary inclination angle ▶ 4.5° 3.5° 2.5° Standard 1.5° 0.5° Feed towards chuck Pitch P (mm) Right-hand thread (Insert + toolholder, right-hand) Example: dia. D = 30 mm; P = 2 Left-hand = shim 1.5° 27 thread (Insert + toolholder, left-hand) Thread ⌀ D (mm) Feed towards tailstock Right-hand thread (Insert + toolholder, left-hand) Left-hand thread Special solution required (Insert + toolholder, right-hand) Necessary inclination angle ▶ – 1.5° – 0.5° 0° 860