EMD223 Machine Component Design

M Ikhwan Z Ridzwan 11 April 2016

Room: 2.18, SoME

mikhwanr@usm.my

Various machine elements that typically used in power transmission

• Belt drives • Chain drives • Gears • Shafts • Bearings • Key • Couplings

Topics covered for designing a mechanical drive

Belt drives and chain drives – recognizing the variety commercially available belt and chain drives and critical design parameters

Kinematics of gears – defining the important geometric features and describing the details of how a pair or more of gears operates

Spur gear design – computing forces exerted by one tooth of a gear on its mating teeth

Keys and coupling – designing keys to be safe under prevailing loads, and specifying couplings at accommodating misalignment of connected shafts while transmitting the required torque at operating speeds

Shaft design – designing for safely transmitted the required torque levels at given speeds

Rolling contact bearings – focusing on commercially available rolling contact bearings such as ball bearings and roller bearings, and able to compute or specify the loads tat the bearings will support, speed of rotation and their expected life

Completion of the design of a power transmission – merging all of the preceding topics together

Lecture notes

https://www.edmodo.com

Lecture notes

Group code: vmh547

Method of assessments

Week %

1 Quiz 5

2 Assignment 10

3 Group project 8 - 13 15

4 Test 14 20

Class meets for 4 hours per week. Lectures will occupy at least between week 8th and 10th. Students will work intensively on problem solving and projects during the remaining week 11th and 13th. Test will be open-text. You are allowed to bring notes/books, however, may not share anything during the test.

List of group projects

Examples of several projects; 1. Can crusher – design a machine to crush soft-drink cans. The crusher would be used in homes or restaurants as an aid to recycling efforts. It could be operated either by hand or electrically. It should crush the cans to approximately 20% of their original volume. 2. Portable crane – design a portable crane to be used in homes, small industries, warehouses and garages. It should have a capacity of at least 1000 lb (4.45 kN). Typical uses would be remove an engine from a car or lift machine components. 3. Paper feeder – design a paper feed device for a copier. The paper must be fed at a rate of 120 sheets per min. 4. Child’s Ferris wheel – design a child’s Ferris wheel. It should be capable of holding one to four children weighing up to 360 N each. The rotational speed should be 1 rev in 6.0 s. It should be driven by an electric motor. 5. Garage door opener – design a garage door opener.

List of group projects (continued)

6. Hydraulic lift – design a hydraulic lift to be used for car repair. Obtain pertinent dimensions from representative cars for initial height, extended height, design of the pads that contact the car, and so on. The lift will raise the entire car. 7. Car jack – design a floor jack for a car to lift either the entire front end or the entire rear end. The jack may be powered by hand, using mechanical actuation. 8. Palm fruit conveyor – design a conveyor to elevate palm fruit into a truck. The top edge of the truck bed is 2.44 m off the ground. The bed is 1.98 m wide, 3.66 m long, and 1.22 m deep. It is desired to fill the truck in 5 min or less. 9. Packaging machine – design a packaging machine. Bottled mineral water are to be taken from a continuous belt and inserted into cartons. Any standard size of bottle may be chosen. The device may include the means to close the cartons after the bottles are in place. 10. Sugar-cane-cutting machine – design a machine that chops long pieces of sugar cane into short lengths prior to processing.

More projects (PPRN)

Refer attachment – List of technical problem need solutions.pdf

Group project

What you should do in the group project; 1. Decide the detailed functions and design

requirements for the design, 2. Conceptualize several approaches to a design -

appendix, 3. Decide which approach to complete, 4. Complete the design of each element in detail, and 5. Make assembly and detail drawings to

communicate your design to others who may use it or be responsible for its fabrication.

Group project

What you should do in the group project; 1. Decide the detailed functions and design

requirements for the design, 2. Conceptualize several approaches to a design -

appendix, 3. Decide which approach to complete, 4. Complete the design of each element in detail, and 5. Make assembly and detail drawings to

communicate your design to others who may use it or be responsible for its fabrication.