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HEY Y’ALL WATCH THIS!

HEY Y’ALL WATCH THIS!. Objectives. Identify parts of a keyhole saw, back saw, and coping saw with 100% accuracy on written handout. Demonstrate correct usage of a keyhole saw, back saw, miter box, and coping saw with 100% accuracy on laboratory activity.

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HEY Y’ALL WATCH THIS!

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  1. HEY Y’ALL WATCH THIS!

  2. Objectives • Identify parts of a keyhole saw, back saw, and coping saw with 100% accuracy on written handout. • Demonstrate correct usage of a keyhole saw, back saw, miter box, and coping saw with 100% accuracy on laboratory activity. • List correct steps to install a blade on a keyhole saw and coping saw with 100% accuracy on written quiz.

  3. TPI • Stands for Teeth Per Inch • Higher the TPI number is the finer and smoother the cut will be, but the more time it will take to make the cut • Lower the TPI number the faster the cut will be, but the lower the quality of the cut.

  4. Coping Saw • A saw with a U-shaped frame used for cutting detailed or irregular shapes on a curve with definite control • Can be used for cutting wood, plastic, or thin metal • Blade • Standard 6 ½” long • Most common 12-15 TPI • Use 10 TPI for wood over 1” thick • Metal

  5. Coping Saw • Correct usage • Install sharp blade with teeth pointing down • Secure material to cut with vice or clamp • Place center of saw blade on starting pointing and make short stroke to begin sawing • Turn handle and frame while sawing to keep blade on line

  6. MAGIC SAW!

  7. Keyhole Saw • Small saw with narrow blade and sharp turning radius. Can be used to cut drywall or wood. • Also known as a compass saw • Blade • Most common is 8-10 TPI • Can range from 5-15” long • thin and narrow • metal

  8. Keyhole Saw • Correct usage • Attach sharp and correct blade • Use a marking tool to mark circle or design that is to be cut out • Drill a starter hole with a drill bit big enough that the keyhole saw can be inserted to begin sawing • Begin cutting by moving the saw back and forth with the teeth of the saw always staying on the marked line • Don’t apply much pressure or cut may not be clean and blade can break

  9. Back Saw • Specialized saw for cutting joints or grooves in wood, usually wood molding • Blade • Rectangle shaped • 8-14” long • 11-20 TPI • Sharpen blade with sharpening tool or take to professional sharpener • Reinforced back • Used to add stability to the blade and prevent bending

  10. Back Saw

  11. Miter Box • Plastic tray with slit sides and a grooved bottom used to hold wood in place while using a back saw to create angled cuts • Angle degrees • 90 • 45 • 22.5 • Cheap to buy, replace when slits are too roughed up by saw to be correct angled any more

  12. Miter Box

  13. Back Saw and Miter Box • Correct Usage • Place wood to be cut in miter box • Mark line to be cut • Align line with slit in side of miter box • Place center of saw on line and make short stroke to begin cutting • Work slowly for best results

  14. Now Lets head out to the Lab!

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