| 摘要 |
<p>The device has a rotary grinding tool comprising impacting/percussion elements (4), in which hollow spaces (5, 5', 5'') are provided. The hollow spaces are pressurized with an internal pressure, and are arranged at a distance to a side (6) of the impacting/percussion elements such that opening of the hollow spaces is taken place during a defined degree of wear. The hollow spaces are communicatively connected with a controller (9), which detects pressure in the hollow spaces. An independent claim is also included for a method for producing hollow spaces.</p> |
