International innovation for torque limiting clutches: Page 4

There are also application cases in which simple clutches subject to backlash can even wear down in engaged position. In most machines, the overload frequency and the vibration behaviour cannot be precisely calculated in advance and therefore it is recommendable to observe the quality of the torque transmission and limiting unit in particular. In order to keep the wear as low as possible, all components used for transmission should be hardened - a matter of course for torque limiting clutches from mayr power transmission.

The frequency of collisions in machines and systems can be reduced, but they cannot be avoided completely. They even happen occasionally on machines with intelligent control and monitoring units. Users ofCNCmachines have confirmed that it is not unusual even for experienced personnel to have a yearly average of two collisions per machine. They occur - usually during the set-up phase - due to incorrect operation, software and hardware errors in the control unit and external mechanical influences. The causes for collisions are for example defective position sensors which report an incorrect actual position, incorrectly-clamped tools or foreign objects which get into the processing area. The consequences are high repair and replacement part costs, downtimes, production stops, reductions in turnover and loss of image due to lead time delays. The servo-controlled individual drive technology has replaced many mechanical components. Several servomotor providers suggest that servomotors with current regulation already offer cost-efficient overload protection and that overload clutches are therefore superfluous. In practise, however, current regulation on servo motors can only be seen as a viable alternative in a few exceptions, mainly on applications with low dynamics and soft collisions.