Drilling Equipment
Drilling equipment consists of a brace, a joint-drilling fixture, an extension bit to allow for drilling into and through thick material, an adjustable bit, and a standard wood bit. These are required in electrical work to drill holes in building structures for the passage of conduit or wire in new or modified construction.
Similar equipment is required for drilling holes in sheet-metal cabinets and boxes. In this case, high-speed or carbide-tipped drills should be used in place of the carbon-steel drills that are used in wood drilling. Electric power drills are also used. See Fig. 1-7.
Fig. 1-7 Drilling equipment.
Woodworking Tools
Crosscut saws, keyhole saws, and wood chisels are used by electricians and refriger- ation and air-conditioning technicians. See Fig. 1-8. They are used to remove wooden structural members, obstructing a wire or conduit run, and to notch studs and joists to take conduit, cable, box-mounting brack- ets, or tubing.
Fig. 1-8 Woodworking tools.
They are also used in the construction of wood- panel mounting brackets. The keyhole saw will again be used when cutting an opening in a wall of existing buildings where boxes are to be added or tubing is to be inserted for a refrigeration unit.
Metalworking Tools
The cold chisel and center punch are used when working on steel panels. See Fig. 1-9. The knockout punch is used either in making or in enlarging a hole in a steel cabinet or outlet box.
The hacksaw is usually used when cutting conduit, cable, or wire that is too large for wire cutters. It is also a handy device for cutting copper tubing or pipe. The mill file is used to file the sharp ends of such cutoffs. This is a precaution against short circuits or poor connections in tubing.
Fig. 1-9 Metalworking Tools
Masonry Working Tools
The air-conditioning tech- nician should have several sizes of masonry drills in the tool kit. These drills normally are carbide-tipped. They are used to drill holes in brick or concrete walls. These holes are used for anchoring apparatus with ex- pansion screws or for allowing the passage of conduit, cable, or tubing. Figure 1-10 shows the carbide-tipped bit used with a power drill and a hand-operated ma- sonry drill.
Fig. 1-10 Masonry drills.
