Machine construction

Academic Year 2023/2024 - Teacher: RAFFAELE BARBAGALLO

Expected Learning Outcomes

Based on the concepts acquired in Structural Mechanics and Applied Mechanics, we will provide the basis for the design of components and simple mechanical systems.

Course Structure

Frontal lessons and exercises on the topics of the course. The course will deals with study and design of mechanical components either on static or dynamic conditions.

Required Prerequisites

Fundamental of Resistence of Material and Applied Mechanics are required. (important)

Attendance of Lessons

According to regulation, compulsory attendance for 70% would be required. However, due to the protracted restrictions for COVID, the attendance of the course will follow the instructions given by the Rector on this topic.

Detailed Course Content

Technical project. Singular functions. Materials Testing.

Beams, diagrams of T and M.

Equivalent stresses.

Material fatigue.

Cumulative damage. Thermographic method.

Notch effects.


Axels and shafts.


Leaf springs of rod holders. Springs with progressive stiffness.

Coil springs. Torsion springs.

Conical torsion springs.


Forced shaft-hub connections. Forced connections plate-fly.

Tabs, keys. splined couplings.

Lubrication: general equations.

Thrust bearing. Plain bearing.

Theory of Hertz. Stribeck formula.

Rolling bearings.

Flanged joints. Flexible couplings. Bibby joint.

Universal joint.

Gears. Thickness of the tooth.

Minimum number of teeth. specific sliding.

Gears design. dynamic correction of the allowable voltage. Bending calculation. Wear calculation. Correct gears.


Exercises on the design and verification of the mechanical parts.

Textbook Information

1. R. Giovannozzi. Costruzione di Macchine. Patron Editore. (consultation)

2. A. Risitano. Mechanical design. CRC Press. (reference)

3. Budinas: Shigley's Mechanical Engineering Design. McGraw-Hill. (reference)

4. Funaioli: Meccanica applicata alle macchine. Patron. Vol. I. (consultation)

Course Planning

 SubjectsText References
1Functions of singularity, Virtual Works PrincipleShigley.
2Ideal stressesGiovannozzi, Risitano, Shigley, teaching notes.
3Fatigue, testing machines, notch effectGiovannozzi, Risitano, teaching notes.
4Shafts and axelsGiovannozzi, Risitano, teaching slides.
5SpringsGiovannozzi, Risitano, teaching slides.
6GearsGiovannozzi, Risitano, teaching notes.
7Hertz's theoryGiovannozzi, Risitano, teaching notes.
8Joints, clutchesGiovannozzi, Risitano, teaching notes.
9Tubes, forced couplingsGiovannozzi, Risitano, teaching notes.
10LubricationGiovannozzi, Risitano, Funaioli, teaching slides.
11Rolling bearingsGiovannozzi, Risitano, teaching slides.

Learning Assessment

Learning Assessment Procedures

Presentation of a group project related to an assembly with the dimensioning of some mechanical components.

Oral examination.

Oral exam. Elements to be evaluated: relevance of the answers, quality of their contents, ability to connect with other topics within the program, ability to report examples, quality of technical language, and overall expressive ability.

To guarantee equal opportunities and in compliance with current laws, students can request a meeting in order to plan any compensatory and/or dispensatory measure, according to the educational goals and specific needs. In this case, it is advisable to contact the CInAP (Centre for Active and Participated Integration - Services for Disabilities and/or SLD) professor of the Department where the Degree Course is included.

Examples of frequently asked questions and / or exercises

Project of gears systems and mechanical components.

Shafts design under torque and bending moment.

Mechanical components design: springs, joints, frictions, brakes.

Forced connections.

Fatigue of the materials.