Lubrication

Most rock drill failures and complaints result from bad lubrication. Correct lubrication of rock drills depends on the following:

1. Selection of the proper lubricant

2. Application of enough lubricant for all working parts

The lubricant must have the correct viscosity for a uniform rate of feed under many temperatures. Besides being just viscous (thick) enough, a good rock drill oil must have the following:

1. High-film strength and the ability to withstand shock loads.

2. Not "blow" readily, or interfere with valve action.

3. Not fog, or exhaust toxic gases.

4. Not corrode under any operating condition.

_5. Lubricate perfectly at maximum drill speed, at both high and low temperatures.

6. Not form gummy leftovers with either hot or cold air.

An in-line oiler must be used with each drill. Drill manufacturers recommend installing the in-line oiler within 10 to 12 feet from the drill. If the oiler is too far from the drill, oil droplets tend to gather on the inside of the hose. This condition results in sporadic delivery of oil to the drill and can result in serious damage to the drill.

Safety

Before operating the drill, ensure the drill steel and bits are in good condition. Drill steel center holes should be clear and the shanks should be flat and square, not chipped or rounded off. Rock bits should be sharp. Dull rock bits are hard on the drill and the operator. To avoid injury to yourself and fellow workers, operate the drill as follows:

. NEVER pound on stuck steel. Nothing is achieved, and you may damage the drill and bit.

l NEVER retract the steel at full throttle. This may damage the front head parts.

. NEVER strike the drill with teds. This may dent the cylinder or cause other damage.

l NEVER drag a drill along the ground, because the exhaust ports and other openings may scoop up dirt that will cause trouble and possible failure.

. Blow out the air supply hose and flush out the water hose before connecting it to the drill to rid the line of dirt.

l Ensure the drill is well-lubricated. Adjust the in-line oiler, so the steel shank always shows a film of oil.

l Keep the drill aligned with the drill steel and hole.

Hold the drill firmly and apply even pressure with both hands.

. Keep all hands off the trigger or throttle until ready to start drilling operations.

l When drilling, keep your balance and NEVER get your face close to the drill.

. Wear safety shoes, safety glasses or impact goggles, gloves, hearing protection, and a hard hat.

. NEVER rest an air tool on the toes of your boots.

. NEVER point a drill at another person or start an air drill while it is laying on the ground. and never point an air hose at yourself or others. the drill.

. Do NOT use your body to control an active . Always bleed the airline before removing it drill from