Method for trimming the working layers of a double-side grinding apparatus

A method for trimming two working layers including bonded abrasive applied on mutually facing sides of an upper and lower working disk of a grinding apparatus configured for simultaneous double-side processing of flat workpieces, the method comprising:

• providing at least one trimming apparatus including a trimming disk, a plurality of trimming bodies and an outer toothing;
• rotating the working disks;
• moving the at least one trimming apparatus between the rotating working disks using a rolling apparatus and the outer toothing under pressure with an addition of cooling lubricant that contains no substances with abrasive action, the moving being on cycloidal paths relative to working layers of the working disks;
• contacting the working layers with the trimming bodies so as to release abrasive substances from the trimming bodies and so as to effect material removal from the working layers as a result of loose grain;
• and
• changing a direction of drives of the grinding apparatus at least twice during trimming.