1. Copyright © 2010 Delmar, Cengage Learning. ALL RIGHTS RESERVED. Unit 15 Woodworking with Power Machines

2. Copyright © 2010 Delmar, Cengage Learning. ALL RIGHTS RESERVED. Safety Precautions Machines should be firmly anchored Mark safety zone around the machine Maintain to manufacturer’s recommendations Keep guards and shields in place at all times Keep blades, knives, and bits sharp Wear goggles, face shield, and other necessary protective clothing Walk (don’t run) around machines Only the operator is to be in safety zone

3. Copyright © 2010 Delmar, Cengage Learning. ALL RIGHTS RESERVED. Safety Precautions (continued) Only use machines in good working order Use only after having had instruction Perform all operations slowly Use a push stick Get help when working with large pieces Turn machine off when leaving Unplug when changing blades / doing repairs Clean with a brush or vacuum cleaner Never clean with your hand

4. Copyright © 2010 Delmar, Cengage Learning. ALL RIGHTS RESERVED. Band Saw Power tool with sawteeth on a continuous blade or band Can cut both straight or curved lines Size of the saw determined by wheel diameter Have blade guides, tilting table, miter gage, rip fence, and speed control Blades classified according to pitch and tooth type

5. Copyright © 2010 Delmar, Cengage Learning. ALL RIGHTS RESERVED. Jig Saw Also known as a scroll saw Designed for sawing curves Cuts by reciprocal action Blades are generally 6½ inches long Many contain pulleys

6. Copyright © 2010 Delmar, Cengage Learning. ALL RIGHTS RESERVED. Table Saw Circular saw with a tilting arbor/tilting table for bevel cuts Classified by the diameter of the blade Provided with a blade guard Three basic types –bench top –contractor’s –cabinet

7. Copyright © 2010 Delmar, Cengage Learning. ALL RIGHTS RESERVED. Radial Arm Saw Power circular saw on a horizontal arm Has many movements Capable of many cutting operations Most popular use is cutoff work Cannot make accurate cuts unless table is level and parallel to arm

8. Copyright © 2010 Delmar, Cengage Learning. ALL RIGHTS RESERVED. Radial Arm Saw Safety Ask instructor before operating Always wear safety glasses/face shield Unplug when making adjustments Pull the saw toward the operator when sawing Keep all guards in place Keep one hand on the saw handle when the saw is turning or being turned on Never turn on saw while blade is touching wood Never stop a turning blade by pushing a piece of wood into it

9. Copyright © 2010 Delmar, Cengage Learning. ALL RIGHTS RESERVED. Miter Saw Motor-driven circular blade Adjustable for angle cuts Also called a motorized miter box or compound miter box when used on wood Useful for cutting metal angles, bars, rods, and masonry materials Material must be held firmly or clamped into place

10. Copyright © 2010 Delmar, Cengage Learning. ALL RIGHTS RESERVED. Jointer Machine with rotating knives Used to straighten/smooth edges and cut bevels Size determined by knife length Height of infeed table determines the depth of cut Designed to remove a small amount of wood at a time

11. Copyright © 2010 Delmar, Cengage Learning. ALL RIGHTS RESERVED. Planers Machine with turning knives Dresses sides of boards to a uniform thickness Also called thickness planer or surface planer Most parts are hidden from view Be sure lumber is free of metal or loose knots

12. Copyright © 2010 Delmar, Cengage Learning. ALL RIGHTS RESERVED. Important Terms Power machine: driven by a force other than human power Stationary: fixed position Miter gauge: adjustable, sliding device that guides lumber Rip fence: guide that keeps work moving in a straight line Reciprocal: back and forth motion Pulley: round device attached to a shaft; designed to fit a drive belt Pivot: to turn or swing

13. Copyright © 2010 Delmar, Cengage Learning. ALL RIGHTS RESERVED. Important Terms (continued) Tilting arbor: motor, belt, pulley, shaft, and blade assembly that moves as one unit Parallel: two edges the same distance apart at all points Push stick: wooden device with a notch to push or guide lumber Dado heads: special blades used to cut a kerf Molding heads: blades that shape wood into moldings Dress: to remove material and leave a clean surface