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Unit 14

Unit 14. Portable Power Saws. Power Tool Safety • Circular Saws • Reciprocating Saws • Jigsaws • Cutout Saws • Chain Saws.

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Unit 14

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  1. Unit 14 Portable Power Saws Power Tool Safety • Circular Saws • Reciprocating Saws • Jigsaws • Cutout Saws • Chain Saws

  2. A portable GFCI compares the amount of current in the hot or ungrounded conductor with the amount of current in the common or grounded conductor and immediately breaks the circuit if a difference greater than 5 mA exists.

  3. Various configurations of approved grounded outlets are available for construction power tools and equipment.

  4. In a typical grounding system, a ground wire runs from the power tool (in this case, a circular saw) to the grounded plug. Another ground wire runs from the grounded receptacle to a grounding bar in the service panel. A copper ground wire extends from the service panel to a ground rod or other grounding means in the earth.

  5. Side-drive and worm-drive circular saws are frequently used in construction work.

  6. Blade diameter affects the maximum depth of cut. When the blade angle is set to 45°, the depth of cut is decreased.

  7. Different blades are used with a circular saw for different operations.

  8. When cutting a compound angle with a circular saw, set the depth of the blade slightly more than the thickness of the material.

  9. When crosscutting long boards supported by sawhorses, do not cut between the sawhorses. Instead, make a cut past the end of a sawhorse.

  10. Position the panel to be cut with the waste piece overhanging the supporting panels.

  11. An adjustable fence attachment aids in making a narrow rip cut with a circular saw.

  12. A straightedge aids in making a straight cut across a panel.

  13. Stand to one side of a circular saw during use.

  14. A reciprocating saw is used for a variety of applications such as cutting a door jamb or notching a stud.

  15. Different blades are used with a reciprocating saw to cut different materials.

  16. A jigsaw is used to saw along curved lines and to cut circular and rectangular openings.

  17. The jigsaw cuts with an orbital movement. The blade cuts on the upstroke and moves slightly away from the material on the downstroke.

  18. A cutout saw uses a spiral bit to cut openings in wood and nonwood materials such as an opening in gypsum board for a receptacle box.

  19. A chain saw is used to cut heavy timbers and pilings.

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