PNEUMATIC POWER TOOLS

The portable power tools that are available for use are either powered by electric motors or by air (pneumatic) motors. Whether powered by electricity or compressed air, the tools are basically the same and the procedures for using them are the same. This section will deal with pneumatic tools since these require unique maintenance and servicing on the jobsite or in the shop.

NOTE: All low-pressure compressed air systems should have a filter, a regulator, and a lubricator assembly installed at the outlet. This assembly will ensure delivery of clean, regulated mist lubricated compressed air for the operation of pneumatic tools.

Figure 12-7.-Using a wheel dresser.

CAUTION

Before operating a pneumatic tool, inspect the air hose and check it for leaks or damage. Blow air through the air hose to free it of foreign material before connecting it to the tool. Keep the air hose clean and free from lubricants. Never point the air hose at another person. Pneumatic tools must have complete lubrication. The moving parts of pneumatic tools are fitted very closely, and they must be lubricated correctly or they will wear quickly and fail to work.

Valves and pistons on pneumatic hammers require a light machine oil. Since the compressed air comes directly in contact with these parts, it has a tendency to drive the lubricant out through the exhaust.

When working continuously with a pneumatic tool, you should regularly check the lubricator to ensure there is ample lubricant available. Next, empty the filter assembly as needed.

On low-pressure compressed air systems that do not have the filter, the regulator, and the lubricator assembly installed, you should disconnect the air hose every hour or so and squirt a few drops of light oil into the air hose connection. Do NOT use heavy oil because the oil will cause precision parts to either fail or to have operating troubles. If this occurs, you have to clean your tool in cleaning solvent to loosen the gummy substance that results. Blow out the tool with air, lubricate it with light oil, and go back to work.

Keep your pneumatic tools clean and lubricated and you will have few operating problems.

SHOP MACHINERY Prefabrication of steel parts and assemblies is typically accomplished in a steel shop where heavy steel working machinery is accessible. The steel shop is tasked with manufacturing and fabricating items, such as sheet-metal ducts, pipeline section fittings, plates, and angles. In the following sections, we will discuss some of the common types of machinery found in a well-equipped steel shop.

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