Jun 25, 2022
MT 256 - Machine DesignCredits: 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
Lecture Hours: 45 Lab Hours: 0
Meets MTA Requirement: None
Outcomes and Objectives
- Explain the steps and features of the design process.
- Describe the attributes of a good designer.
- Differentiate between the steps in the design process.
- Apply a class brainstorm session to a product design.
- List the tools used by a designer
- Review engineering properties of materials as they apply to design.
- Discuss load-stress relations of products and machine elements under static loading:
- Discuss load-deflection relations of products and machine elements under static loading:
- Uniaxial deformation / Poissons Effect
- Thermal expansion
- Angle of twist
- Beam deflection
- Demonstrations will include the use of tensile test machine, torsion machine, and bending testing.
- Determine the factor of safety given the loading on a machine element of all dimensions and materials.
- 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.
- Specify dimensions for a brittle element.
- Specify dimensions and material for a ductile link in tension/compression/bending
- Specify dimensions and material for a ductile pin in shear.
- Specify dimensions and material for a shaft in a power transmission with shoulders, keyways, and bearing locations.
- Specify dimensions and material of a screw fastener, both diameter and thread engagement.
- Specify dimensions and material of the key in a keyed coupling, or the bolts and flange of a flanged coupling.
- 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.
- 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.
- Specify the belt cross-section, length, sheave diameters, and center-to-center distance for a belt drive.
- Specify the chain size, length, sprocket sizes, center-to center distance and lubrication for a roller chain drive.
- Specify number of teeth, diametral pitch, pitch diameter, and other dimensions for a gear drive.
- Create a layout drawing of a gear transmission using CAD software.
- Demonstrate General Education Concepts.
- Demonstrate Critical Thinking in Design.
- Obtain 80% accuracy in calculations, based on testing.
- Obtain 75% in problem setup such as Free Body Diagram, theory application, and assumptions, based on testing.
- Obtain 75% in inferential reasoning, whereby experience in a related problem solution carries over to the new problem, based on testing.
- Demonstrate skill to work on your own.
- Demonstrate reading skills and problem identification from the text.
- Demonstrate resourcefulness using the text, Internet, co-workers, other books or magazines, fellow students.
- Demonstrate self-motivation by surviving the online course, through weekly homework assignments.
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