Session 2: Saws, Part 2; Other Power Tools

Session Two Objectives Related Performance Tasks: Safely and properly demonstrate the use of the following tool(s): • Portable band saw • Miter or cutoff saw • Portable or bench grinder • Pneumatic nail gun • Pavement breaker When trainees have completed this session, they should be able to do the following: Identify and explain how to use various types of power saws. Identify and explain how to use a portable band saw. Identify and explain how to use miter and cutoff saws. Identify and explain how to use various grinders and grinder attachments. Identify and explain how to use various types of grinders. Identify and explain how to use various grinder accessories and attachments. Identify and explain how to use miscellaneous power tools. Identify and explain how to use pneumatic and powder-actuated fastening tools. Identify and explain how to use pavement breakers. Identify and explain the uses of hydraulic jacks. Introduction to Power Tools 00104-15

Sections 2.3.0 to 2.3.2 – Band Saws Used almost exclusively on metal. Little or no added pressure is required. Check for blade wear if the cut is not progressing as expected. Low speeds are best for metal cutting. Many band saws have only one speed. Push the stop against the workpiece before starting the saw. The blade can easily be twisted and stressed while cutting, which results in breakage. Introduce the portable band saw and explain that it is primarily used for cutting metal. Describe the blade and point out that band saws operate at relatively low speeds. Stress that the band saw stop must be against the workpiece before starting the saw. Explain that the weight of the saw is all that is needed for cutting to occur; added pressure wears the blade. Introduction to Power Tools 00104-15

Sections 2.4.0 and 2.4.1 – Miter Saws Compound miter saws allow for multiple angles in a single cut. Sliding models allow for cutting wider stock. Many abrasive saws are for cutoff service only; the cutting angle cannot be set. Introduce miter and cutoff saws. Explain the difference between standard miter saws and compound models. Describe the compound sliding miter saw. Introduction to Power Tools 00104-15

Section 3.1.0 – Grinders Die grinders and detail grinders are used for finer work, such as removing casting waste from components. Angle grinders are very common metalworking tools, especially for welders, pipefitters, and ironworkers. Knotted wire wheels and cups are common in addition to grinding wheels. Describe the uses of angle grinders and their construction. Point out that detail grinders have the tool operating in-line with the motor shaft. Define and describe points. Discuss the use of bench grinders. Emphasize the importance of using wheels with the proper ratings. Introduction to Power Tools 00104-15

Sections 3.1.1 and 3.1.2 – Grinders Grinder Safety Face shields should be worn with all grinders. The maximum rpm of the grinding wheel must be greater than or equal to that of the grinder. Grinders create a shower of sparks. Ensure the work area is clear of flammable materials. Keep the tool rest within 1/8-inch (about 3 mm) of the wheel. Perform a ring test on new grinding wheels. Explain how to hold and use an angle grinder. Explain that pressure on the tool must be controlled and light. Discuss the adjustments made to a bench grinder. Emphasize the importance of keeping the workpiece cool. Discuss the PPE required for grinding. Talk about grinding disc and wheel selection. Describe and demonstrate how to do a ring test on a grinding wheel. Introduction to Power Tools 00104-15

Section 4.1.0 – Nailers Pneumatic nailers can set many nails very quickly and they eliminate the need to grab and hold the nail. The nose of the nailer must be depressed against a firm surface before it will fire. Powder-actuated tools are excellent when there is no air or electric power. They can fire fasteners directly into concrete, which is their primary use. Alternative methods (drilling and anchors) are much more labor-intensive. Describe pneumatic nailers and how they work. Point out the safety features. Describe powder-actuated tools. Explain that certification is required to operate them. Introduction to Power Tools 00104-15

Section 4.2.0 – Pavement Breakers A variety of attachments are available for pavement breakers, depending upon the task. A typical pneumatic model weighs between 50 and 90 pounds (20 to 40 kg). Consider what is under the area being broken up, such as wiring or piping. Explain how pavement breakers operate. Describe their operation and point that they are heavy tools. Describe the possible attachments. Introduction to Power Tools 00104-15

Section 4.3.0 – Jacks Jacks can be used for various tasks, such as raising equipment for the installation of permanent footings and vibration isolators. A jack should never be depended upon to hold a load; lift, position supporting materials, and then remove the load from the jack. Discuss the exceptional force developed by hydraulic tools. Describe the construction of a hydraulic jack. Explain that the pump can be internal or a separate component. Describe jack characteristics such as capacity and stroke. Introduction to Power Tools 00104-15

Next Session… LABORATORY: USING POWER TOOLS   LABORATORY: USING POWER TOOLS Review the complete module to prepare for the laboratory and Performance Tasks in the next session. Introduction to Power Tools 00104-15