Question:     15.3.2  The amount of existing mechanical backlash is found before any adjustments, mechanical or control-side.  Answer the following:      c.)  Repeat Part b.) This time for checking the rotary backlash on a machining centers rotary 4th axis.     Answer:   The common topics for every CNC machine are listed in the CNC ToolBox.           Please visit often, more content coming for the CNC links and exercises.