Assessments - 2, GPA: 4.5
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Installing Bits into Keyed Chucks (Fig.1) Fig. 1 1. Unplug tool. 2. Open the chuck jaws wide enough to insert the bit. Be sure the bit shank and chuck jaws are clean. Dirt particles may prevent the bit from lining up properly. 3. Insert the bit into the chuck. Center the bit in the chuck jaws and lift it about 1/16" off of the bottom. Then, tighten the chuck jaws by hand to align the bit. 4. Place the chuck key in each of the three holes in the chuck, turning it clockwise. Tighten securely. 5. To remove the bit, insert the chuck key into one of the holes in the chuck and turn it counterclockwise. Bit Selection • Use sharp bits. Sharp bits are less likely to bind when drilling. • Use the proper bit for the job. There are many types of bits designed for specific purposes. Check the information on the bit's packaging for proper usage. • Do not use bits larger than the rated capacity of the drill. Gear damage or motor overload may result. Pipe Handle The pipe handle may be used on either side of the tool. Thread pipe handle into one of the threaded holes in the motor housing. Spade Handle (Fig. 2) Fig. 2 B A C The spade handle can be attached to the tool in three positions (Fig. 2). Remove the hex head screws which secure the handle. Remove the handle and move it to the desired position. To mount the handle in position C, it is necessary to reverse the mounting holes by turning the handle around. warning To reduce the risk of injury, wear safety goggles or glasses with side shields. Unplug the tool before changing accessories or making adjustments. warning To reduce the risk of personal injury when drilling, always hold tool by the insulated gripping surfaces when performing an operation where the cutting tool may contact hidden wiring or its own cord. Contact with a "live" wire will make exposed metal parts of the tool "live" and shock the operator. warning When drilling with a single speed drill or in HI with a two speed drill, always hold the drill securely using the pipe handle, or brace the drill against a solid fixed object in preparation for a sudden reaction. When drilling in LO with a two speed drill, always brace the drill against a solid fixed object in preparation for a sudden reaction. When drilling, never use your body to brace drill. Never put your hands (or other body parts) between the part of the drill being braced and the object it is being braced against. Hands (or other body parts) that are in the path of the reaction can be pinched, crushed and broken. warning To reduce the risk of personal injury when drilling, always hold tool by the insulated gripping surfaces when performing an operation where the cutting tool may contact hidden wiring or its own cord. Contact with a "live" wire will make exposed metal parts of the tool "live" and shock the operator. warning When drilling with a single speed drill or in HI with a two speed drill, always hold the drill securely using the pipe handle, or brace the drill against a solid fixed object in preparation for a sudden reaction. When drilling in LO with a two speed drill, always brace the drill against a solid fixed object in preparation for a sudden reaction. When drilling, never use your body to brace drill. Never put your hands (or other body parts) between the part of the drill being braced and the object it is being braced against. Hands (or other body parts) that are in the path of the reaction can be pinched, crushed and broken. operaTion Bit binding (Fig. 3) B A Fig. 3 If the bit binds, the drill will suddenly react in the opposite direction of the rotation of the bit. Figure 3 shows the path of reaction (B) if the drill bit binds while being driven in forward (A). The operator should reduce the chances of a sudden reaction by following the instructions listed below. The operator should also prepare for a sudden reaction by holding securely using the pipe handle or bracing against a solid fixed object. To reduce the chance of bit binding • Use sharp bits. Sharp bits are less likely to bind when drilling. • Use the proper bit for the job. There are many types of bits designed for specific purposes. • Use the proper speed for the size bit. Larger bits should be run at the lower speed. Driving larger bits at high speeds will increase the chance of the bit binding and increase the chance of reaction. • Avoid drilling warped, wet, knotty, and or pitchy material if possible. • Avoid drilling in material that you suspect contains hidden nails or other things that may cause the bit to bind. The direction of reaction is always opposite of the direction of bit rotation. Reaction is even more likely to occur when enlarging already existing holes and at the point when the bit breaks through the other side of the material. Bracing for forward rotation Fig. 5 Fig. 4 B C A A B D When drilling in forward, the bit will rotate in a clockwise direction. If the bit binds in the hole, the bit will come to a sudden stop and drill will suddenly react in a counte...
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