By Keith L. Richards
The Engineering Council (UK) have pronounced an encouraging bring up within the functions for Engineering Technician (Eng. Tech) registration, either from candidates following a work-based studying software and contributors with out formal skills yet who've verifiable competence via massive operating reviews and self-study.
Design Engineer's Case experiences and Examples has been written for those younger engineers. The contents were chosen on common matters that constructing engineers might be anticipated to hide of their specialist profession and offers options to normal difficulties which may come up in mechanical design.
The matters coated comprise the following:
- Introduction to emphasize calculations
- Basic shaft design
- Beams below bending
- Keys and spline energy calculations
- Columns and struts
- Material selection
- Conversions and common tables
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Extra resources for Design Engineer's Case Studies and Examples
The position of the neutral axis from the datum edge (X:X) is calculated by multiplying the distances of the CG of the individual sections (y) from the datum by the corresponding area (column 4) for that section. 4. 4 are then summed to give values of ΣA and ΣAy. The value of y1 is then calculated by dividing ΣAy by ΣA, and y2 is calculated by subtracting y1 from the total vertical dimension for the figure. The calculation for the moment of inertia (I) of the individual sections can be completed.
It is recommended that the fillet radius r be as large as possible to minimise the stress concentration. 5 Fillets on a shaft. the designer has no control over the radius and has to accommodate it in the design. 5). Although the term sharp is used, this does not mean truly sharp and without any fillet radius at all. Such a shoulder configuration would have a very high stress concentration factor and should therefore be avoided. One such situation where it is likely to occur is where a ball or roller bearing is to be located.
This may be in an automotive situation, and here the shaft will be subject to a variable torque as the car or truck accelerates or decelerates during the course of its journey. These are just some examples of the use of a shaft, and the next phase is to ensure that the shaft is “fit for function” and will not fail during its operating life. 1 Typical layshaft. 3 Calculate the Forces Acting on the Shaft Develop a free-body diagram by replacing the various machine elements mounted on the shaft by their statically equivalent load or torque components.