The fence should contain as small an opening as possible for the knives, and should extend at least 18 inches on either side of the spindle. Split adjustable fences are useful for guarding when the entire edge of the stock is to be shaped.
• For automatic wood-turning lathes with rotating knives, cover the cutter head with a metal shield or hood that completely covers the knives and material, except at the contact points, when the machine is in operation.
• Guard feed rolls with a semi-cylindrical guard to prevent the operator’s hands from coming in contact with the in-running rolls on automatic sanders. The guard design must allow for adjustment to any thickness of stock.
• Enclose drum and disc sanders with guards, except for the portion of the sander’s drum above the table. The guard can consist of a protective cover at the rear side of the wheel and a hinged cover around the wheel periphery.
Operators may be injured from inadvertent contact with the rotating tool when handling the stock or removing scrap from the table. Kickback is another common source of injury among router operators. Kickback may be caused by poor-quality lumber (i.e., if the stock breaks) or incorrect work method, such as feeding the stock into the tool too abruptly or in the wrong direction, or poorly fixing the stock to the template.
Projection of tools can severely injure or kill router operators. Tools can be flung from the cutter head if they are poorly fastened in the tool holder, if the wrong tool is used, or if the tool speed is too high.
• The cutting head and saws must be guarded with metal guards. Cover the unused part of the periphery of the cutting head. If an exhaust system is used, the guard must form part of the exhaust system
• All of the metal framework on electrically driven machines must be grounded, including the motor, motor casing, legs, and frame. This includes other equipment such

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