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Essay by abdulkhalik2007Junior High, 9th gradeA-, October 2014

 Project 1.1.6 Compound Machine Design - VEX

Introduction

 Mechanical systems often require a combination of mechanisms to complete a given task. Any time two or more machines are combined, the result is a compound machine. If many mechanisms are combined, the machine may even be referred to as a complex machine. Compound machines can range in complexity from a crane or automobile to a simple manual can opener. A bicycle is an example of a compound machine. The pedals, brakes, handle bars, and sprocket systems are just some of the mechanisms on most bicycles. In this activity you will work in teams to design and build a compound machine to accomplish an instructor-specified task.

Equipment

VEX POE kit, including gears (sprockets), chains, belts, axles, and support pieces

Rope for pulley systems (masonry line works well)

Design Constraints

The applied effort force may only be provided by a single human input.

The final design must include a minimum of three mechanisms including any of the simple machines: a gear system; a pulley and belt system; and/or a sprocket and chain system.

The compound machine must have a mechanical advantage greater than 1.

Procedure

Determine the instructor-assigned task in detail, including all required operations and time constraints.

Investigate available equipment components and possible configurations.

Brainstorm ideas for accomplishing the assigned task, and record at least three ideas in your engineering notebook.

Using isometric grid paper or 3D modeling software, sketch and annotate a preliminary design solution including the individual mechanism's mechanical advantage and the drive ratios.

Build, test, and modify your compound machine design.

Using isometric grid paper or 3D modeling software, sketch and annotate your final design solution including the individual mechanism's mechanical advantage and the drive ratios.

Use the tables below to document and illustrate the mechanical advantage and drive...