Question:     15.3.2  The amount of existing mechanical backlash is found before any adjustments, mechanical or control-side.  Answer the following:     a.)  Why is backlash checked with feed, rather than handle moves?     b.)  Make a procedure for checking the linear backlash on a turning center.  Include:         i.)  A sketch showing axis movement and indicator placement.        ii.)  A short incremental test program with spindle off).       iii.)  A blank chart for recording three trials of test data.     c.)  Repeat Part b.) This time for checking the rotary backlash on a machining centers rotary 4th axis.     Please visit often, more content coming for the CNC links and exercises.