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Hole saws - best use

► best hole saw use

• Hole saws ensure fast, accurate hole cutting in tough, fracture resistant HSS Bi-Metal.  Maximum cutting depth for all sizes is 32mm.  Recommended for steel, cast iron, lightweight alloys, aluminium, brass, wood and plastics
• The pilot drill must extend beyond the edge of the hole saw teeth by 1/8" (3mm)
• Always secure the material to be cut to ensure the turning action of the hole saw does not cause the work piece to spin or slip
• Can be used in drill presses, lathes, portable electric drills with corresponding speeds and adequate power output
• Start the hole saw square to the work piece with steady feed pressure.  Unbalanced tooth engagement will result in erratic hole saw action and tooth strippage
• Care should be taken to ensure the proper direction of rotation

• Select proper speed for material from operating speed chart
• Use a high-quality cutting oil to assist chip clearance and blade lubrication with metals (except cast iron).  Petroleum cutting oil ensures smoother operation and longer service life with aluminium
• When working at the upper ranges of the hole saws capacity, they should be worked in and out to help clear chips
• Occasionally check the mandrels drive pins to prevent them from vibrating out of the hole saws drive pin holes
• Apply even pressure (if possible at right angles to the work piece) to prevent damage to teeth
• Avoid overheating the hole saw
• Always wear eye protection

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