SAFETY PRECAUTIONS FOR USE WITH PNEUMATIC TOOLS

at the air lines before changing grinding wheels, needles, chisels, or other cutting or drilling bits. · The air hose must be suitable to withstand the pressure required for the tool. A leaking or defective hose should be removed from service. The hose should not be laid over ladders, steps, scaffolds, or walkways in such a manner as to create a tripping hazard. Where the hose is run through doorways, the hose should be protected against damage by the doors' edges. The air hose should generally be elevated over walkways or working surfaces in a manner to permit clear passage and to prevent damage to it. · All portable pneumatic grinders must be equipped with a safety lock-off device. A safety lock-off device is any operating control that requires positive action by the operator before the tools can be turned on. The lock-off device must automatically and positively lock the throttle in the OFF position when the throttle is released. Two consecutive operations by the same hand are required, first to disengage the lock-off device and then to turn on the throttle. The lock-off device should be integral with the tool. It should not adversely affect the safety or operating characteristics of the tools, and it should not be easily removable. Devices, such as a "dead-man control," that do not automatically and positively lock the throttle in the OFF position when the throttle is released are not safety lock-off devices. For detailed information on safety precautions, see Navy Occupational Safety and Health (NAVOSH) Program Manual for Forces Afloat, OPNAVINST 5100.19 (latest series). SAFETY PRECAUTIONS FOR USE WITH PNEUMATIC TOOLS—SPECIFIC In operating or maintaining air-driven tools, take the following precautionary measures to protect yourself and others from the damaging effects of compressed air: · Inspect the air hose for cracks or other defects; replace the hose if found defective. WARNING Before opening the control valve, see that nearby personnel are not in the path of the airflow. Never point the hose at another person. · Open the control valve momentarily before connecting an air hose to the compressed air outlet. Then, make sure the hose is clear of water and other foreign material by connecting it to the outlet and again opening the valve momentarily. · Stop the flow of air to a pneumatic tool by closing the control valve at the compressed air outlet before connecting, disconnecting, adjusting, or repairing a pneumatic tool. REVIEW QUESTIONS Q33. Identify different types of portable pneumatic power tools. Q34. What are rotary and needle sanders used for? Q35. List the safety precautions that apply to portable pneumatic power tools. SCREW AND TAP EXTRACTORS LEARNING OBJECTIVE: State the purpose of screw and tap extractors. Screw extractors are used to remove broken screws without damaging the surrounding material or the threaded hole. Tap extractors are used to remove broken taps (fig. 1-68, view A). 1-42 Figure 1-68.—Screw and tap extractors.