Vibration occurs when machining long, small diameter components or during internal machining with long overhang boring bars This is particularly

Vibration occurs when machining long, small diameter components or during internal machining with long overhang boring bars. This is particularly the case if L/D > 4. As far as tool selection is concerned, the following parameters must be noted for reducing the risk of vibration. D Vibration tendency 1. Basic insert shape / Positive cm Negative, double-sided mi Negative, single-sided 2. Insert shape 35° 80° 3. Approach angle 4. Corner radius R 0,2 R 0,4 R 0,8-1,2 5. Effective rake angle 6. Coating uncoated PVD CVD Once the tool / insert has been selected, other factors are decisive for reducing vibration 1. Clamp tools and boring bars at the shortest length possible. 2. Select cutting depth 0.004 in 0.1 mm greater than the corner radius of the insert. 3. If vibration occurs, reduce cutting speed by 50-70 % in relation to the specified catalog values. 4. Check clamping pressure at tail stock spindle during external machining. A 452 WALTER Valenite Technical information Turning Usage information Vibration tendency