Jun 25, 2022  

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MT 256 - Machine Design

Credits: 3
Uses hand calculator and computer methods to solve for the dimensions and allowable loads of machine elements and power trains. Studies shafts, keyed couplings, bearings, gear trains, V-belt and chain drives, springs and fasteners. Requires a final design using CAD.

Prerequisite(s): MT 250  with a grade of “C” or better
Corequisite(s): None
Lecture Hours: 45 Lab Hours: 0
Meets MTA Requirement: None
Pass/NoCredit: No

Outcomes and Objectives
  1. Explain the steps and features of the design process.
    1. Describe the attributes of a good designer.
    2. Differentiate between the steps in the design process.
    3. Apply a class brainstorm session to a product design.
    4. List the tools used by a designer
  2. Review engineering properties of materials as they apply to design.
    1. Discuss load-stress relations of products and machine elements under static loading:
      1. Tension/compression
      2. Torsion
      3. Bending
    2. Discuss load-deflection relations of products and machine elements under static loading:
      1. Uniaxial deformation / Poissons Effect
      2. Thermal expansion
      3. Angle of twist
      4. Beam deflection
    3. Demonstrations will include the use of tensile test machine, torsion machine, and bending testing.
  3. Determine the factor of safety given the loading on a machine element of all dimensions and materials.
  4. Use the appropriate mathematical formulas and design factors to produce an acceptable paper design given the loading, either static or time-varying, on a machine element.
    1. Specify dimensions for a brittle element.
    2. Specify dimensions and material for a ductile link in tension/compression/bending
    3. Specify dimensions and material for a ductile pin in shear.
    4. Specify dimensions and material for a shaft in a power transmission with shoulders, keyways, and bearing locations.
    5. Specify dimensions and material of a screw fastener, both diameter and thread engagement.
    6. Specify dimensions and material of the key in a keyed coupling, or the bolts and flange of a flanged coupling.
    7. Specify the wire diameter, OD, pitch, and length of a helical coil compression spring using appropriate software, and check buckling stability and natural frequency when appropriate.
  5. Use the appropriate mathematical formulas, design factors, and charts to produce an acceptable paper design of a transmission given the torque-speed requirements between two shafts of a transmission.
    1. Specify the belt cross-section, length, sheave diameters, and center-to-center distance for a belt drive.
    2. Specify the chain size, length, sprocket sizes, center-to center distance and lubrication for a roller chain drive.
    3. Specify number of teeth, diametral pitch, pitch diameter, and other dimensions for a gear drive.
    4. Create a layout drawing of a gear transmission using CAD software.
  6. Demonstrate General Education Concepts.
    1. Demonstrate Critical Thinking in Design.
      1. Obtain 80% accuracy in calculations, based on testing.
      2. Obtain 75% in problem setup such as Free Body Diagram, theory application, and assumptions, based on testing.
      3. Obtain 75% in inferential reasoning, whereby experience in a related problem solution carries over to the new problem, based on testing.
    2. Demonstrate skill to work on your own.
      1. Demonstrate reading skills and problem identification from the text.
      2. Demonstrate resourcefulness using the text, Internet, co-workers, other books or magazines, fellow students.
      3. Demonstrate self-motivation by surviving the online course, through weekly homework assignments.

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