Bosch Air tools for industry catalog Page 112
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112 | Air technology guide More dynamics due to speed control From practical experience, for practical application: frequent operating errors Starting torque The speed control offers the following advantages: Mmax Stall torque ▶ High sanding performance M ▶ Lower disc consumption Pmax ▶ Time saving ▶ Reduced motor wear Certain operating errors are usually the cause of unsatisfactory ▶ Lower noise level P results or faults. The sensitive speed controller The following are frequent errors: enables virtually constant working ▶ Incorrectly selected tools (machine too weak or too strong for the intended purpose) ▶ Insufficient air quantity and Speed n n0 controlled n0 uncontrolled the tool the right range at a consistent cir- with speed control Power P cumferential speed. As the speed without speed control Torque M increases, the controller weights swivel outwards, causing the insufficient pressure or no constant pressure directly before speed and, therefore, grinding in Fig. 6 Characteristic curves with and without speed control valve body to the make the inflow cross-section smaller. If the speed is reduced, the force of the return ▶ Insufficient cross-section of the spring outweighs them, and the feed line cross-section enlarges (Fig. 7). ▶ Missing maintenance devices, dirt, water and missing oil lead to premature failure of the machine due to fast wear and rust formation in the motor ▶ Knocked-out, blunt or unsuitable bits or abrasives reduce Controller weight Valve body efficiency Return spring Fig. 7 Speed control Controller weight
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