Simple Machines Part 2 Inclined Plane Wedge Screw Stu Egli Associate Professor Engineering Technology.

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Presentation transcript:

Simple Machines Part 2 Inclined Plane Wedge Screw Stu Egli Associate Professor Engineering Technology

Six Simple Machines Lever Wheel & Axle Pulley Inclined Plane Wedge Screw

Key Terms

The Inclined Plane

Geometry and Definitions A B H L R E 

Formulas for Inclined Planes A B H L R E  MA =

Inclined Plane Problem 1 Given the diagram as shown, if L equals 12 inches, H equals 3 inches and the effort is 30 pounds, find the mechanical advantage and the maximum load that can be moved. What is the tradeoff for reducing the effort? A B H L R E 

Inclined Plane Problem 1, solution A B H L R E 

Wedge

Inclined Plane vs. Wedge Effort Inclined Plane Effort Wedge

Shape of Wedges Single L H Double L H

Formulas for Wedges MA = Single L H Double L H

Wedge Problem 1 Find the mechanical advantage and the maximum separation load for a wedge with an incline length of 10 inches, an overall height of 4 inches, and which is exerting an effort of 100 pounds. L H

Wedge Problem 1, solution Effort MA =

Screw

Screw Thread Classifications 1/ UNC 1/4 is the outer diameter of the threads. 20 is the number of threads per inch of screw length. UNC refers to Unified National Coarse thread.

Screw Definitions OD 1in. Number of Threads per Inch View A Pitch

Screw Pitch Pitch = Number of Threads per Inch 1in.

Screw Formulas MA =

Screw Problem 1 A screw with 20 threads per inch is turned by a screwdriver having a handle diameter of 1 inch. What is the mechanical advantage of the screw? MA =

Screw Problem 1, Solution Pitch = Circumference = MA =

References: Garratt, J. (1996). Design and Technology, 2 nd Ed., Boston, MA: Cambridge University Press.

Credits: Writer: George Reluzco Content Editor: Donna E. Scribner Narration: CJ Amarosa PLTW Editor: Ed Hughes Production: C.J. Amarosa

Inclined Plane

The Wedge

The Screw Circumference = 2  (RADIUS) =  (DIAMETER)