For the cutting operations to carry out smoothly the blades of the saw machines needs to be constantly sharpened
using files and grinders. Figure 11 shows the worker sitting without a back support and arm support and grinding the saw
blades for smoother cutting. Fig 12 showing the worker providing the zigzag pattern to the blades of the vertical band saw
because it pushes the wooden log down on the work table, this is done after almost every hour. Applying strain index for the
clip of cycle duration 78 seconds the strain index for right hand is much high i.e. above 60 and for left hand is below 3.
Hence safe for the left hand but unsafe for the right hand.