Bosch Air tools for industry catalog Page 36
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36 | Screwdrivers, tappers | Torque accuracy Achievable torque accuracy 3 Torque accuracy depending on screwdriver system and screwdriving application or “soft” screw connections, some of the values that can be achieved are well below the nominal values. The torque dispersion also increases. Due to the wide The torque that can be achieved for a screw connec- variety of possibilities, specifications with absolute tion depends on the type of screwdriving application. values are not possible. If in doubt, use a trial and In order to obtain an equal basis for assessment, all error system. The table provides an overview of the the data for screwdrivers refers to inflexible or “hard” advantages and achievable torque accuracy of the indi- screw connections (30° angle of rotation) at 6.3 bar vidual screwdriver systems in various characteristic flow pressure. In the case of lower pressure or flexible screwdriving applications. Screwdriver systems Features Torque Screwdriving applications Shut-off clutch for high, consistent torque accuracy Lockover clutch Impulse mechanism for the common screw connection with sufficient torque accuracy Angle of rotation up to M max. with low reaction torque, but with moderate torque accuracy Impact mechanism Direct drive (Standstill screwdriver) for high torques with limited tolerance accuracy for low torque accuracy; maximum torque when choking the motor to standstill Rating of the torque accuracy up to approx. 30° very good satisfactory satisfactory low – depending on requested M accuracy low up to approx. 60° good to very good low satisfactory low low above 60° good – if shut-off function is still guaranteed low satisfactory low low good – if shut-off function is still guaranteed low satisfactory low low good – if shut-off function is still guaranteed low satisfactory low low good – if shut-off function is still guaranteed satisfactory – if function is still guaranteed low low – if screw is still being turned less suitable Torque Revolutions Torque Revolutions Torque Revolutions Revolutions Torque Angle of rotation not definable Torque Revolutions Revolutions
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