Rockford Systems, Inc. has the answer on how to protect belt sander and/or disc sander operators.  High-quality, adjustable belt sander and disc sander shields are now available.  These shields place a barrier between an operator and flying debris generated at the point of operation.  They fasten directly to the machine using 1” x 2” extruded aluminum with mounting hardware included.  The transparent portion of the shield is constructed of high-impact-resistant, 3/16”-thick clear polycarbonate.  Easy vertical adjustment of the shields is achieved simply by loosening and tightening the black knobs.