PNEUMATIC TOOLS

Pneumatic tools can be used with any type or size compressor as long as the psi and cfm requirements for the tool are met. In the NCF, pneumatic tools are normally stored and checked out from the central toolroom along with the air supply hose.

^{Figure 14-12.-In-line oiler.}

When checking out a tool, you should determine if the tool needs an in-line oiler. If an in-line oiler (fig. 14- 12) is needed to provide lubrication to the tool, follow the tool manufacturer's recommendation for the correct lubrication.

PAVEMENT BREAKER/ JACKHAMMER

The pavement breaker resembles a portable rotary rock drill/jackhammer. The pavement breaker consist of a piston that is moving in a chamber under air pressure and weighs between 30 to 90 pounds. The major working parts of a pavement breaker are shown in figure 14-13. Notice no rotational mechanism is provided and no variation in speed is possible. This is the major difference between the pavement breaker and rotary rock drill/jackhammer.

Pavement breaker attachments (fig. 14-14) are the moil point, the chisel point, the asphalt cutter, and the clay spade.

Figure 14-11.-Air compressor.

Figure 14-13.-Pavement breaker.

Moil Point

The moil point is commonly used to break up pavement, rock, asphalt, or concrete. The moil point is a solid bar of case-hardened steel, pointed at one end, with a shank and upset collar at the other. The advantage of the moil point is its sharp point which allows it to first make a small hole that then slowly deepens and widens until the sides of the point are in full contact with the rock. The effect is like a wedge splitting an object.