Internal Machining

Overcome vibrations in internal turning Silent ToolsŪ damped boring bars and adapters makes it possible to maintain good productivity and close tolerances also for long tool overhangs. With Silent ToolsŪ turning tools it is possible to do turning operations with good result at overhang beyond 4 x bar diameter. Silent ToolsŪ damped steel bars/adapters makes it possible to machine up to 10 x bar diameter, and our damped carbide reinforced bars go even up to 14 x bar diameter tool overhang. Boring bar dia, dmm (mm) Engineered products Steel dampened boring bars Carbide reinforced dampened boring bars The selection of boring bar material has a huge impact on achieving the best production economy: Overhangs up to 10 x dmm are usually solved by applying a steel dampened boring bar to accomplish a sufficient process. Overhangs over 10 x dmm require a carbide reinforced dampened boring bar in order to reduce radial deflection and vibration. Maximum recommended overhang Internal turning is very sensitive to vibration. Minimize the tool overhang and select the largest possible tool size in order to obtain the best possible stability and accuracy. For internal turning with steel dampened boring bars, the first choice is bars of type 570-3C. For grooving and threading where the radial forces is higher than in turning, the recommended bar type is 570-4C. The table below shows the maximum recommended overhang for different bar types. Bar type Turning Grooving Threading Steel boring bars 4 x dmm 3 x dmm 3 x dmm Carbide boring bars 6 x dmm 5 x dmm 5 x dmm Steel dampened boring bars 10 x dmm 5 x dmm* 5 x dmm* Carbide reinforced dampened boring bars 14 x dmm 7 x dmm 7 x dmm * 570-4C bars previous top of page

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