University of Botswana
Department of Mechanical Engineering
Course Code: MMB 441
Course Name: Machine Design II
Session: Semester 2, 2020/2021
Design Project No: 1 Due Date: 02 May 2021
In a turbine drive 300 kW power is transmitted using a pair of double helical gear. The pinion
speed is 2950 rpm and that of the gear is about 820.5 rpm. There are no spare constraints on
the gear drive. Selecting suitable materials, design the pinion and the gear to last for 106
cycles. Design the complete gear box by considering no lubrication.
Note: Select appropriate materials and any other data necessary to make the design
Specific Objectives of the project:
1.
2.
3.
4.
5.
6.
7.
Calculate the dimensions and specifications of gear and pinion
Design the pinion and gear shaft.
Analyse the pinion and gear shaft using SolidWorks and compare the results with your
results from analytical method. Make a tabular summary of your results.
Based on the given data and the reactions found, select bearings for each of the
supports. You will need to choose an appropriate load application factor, AF, from
design tables.
Draw all individual components and an assembly of the gear box in 2D.
Draw a scaled drawing (3D model) of the entire system using SolidWorks. You will have
to show all elements of the gearbox including its housing.
Prepare a word-processed report and submitted via Moodle. All sketches/drawing should be
embedded in the report. The report should include:
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Title Page
Abstract
Table of Contents
Introduction - Establish and justify need
Background
Specifications which should include description and evaluation
Calculations, Drawing & Results and their descriptions and comparison
Conclusion & Recommendations
Comments on Project Experience
References
8. Prepare to defend your report on 06 May, 2021 using SolidWorks.
1
S/N
Turbine Power (KW)
Pinion Speed (rpm)
Gear Speed (rpm)
1
300
2950
820.5
2
301
2949
820.3
3.
299
2952
819.0
4
299.5
2951
819.5
5
293
2950.5
820.3
6
294
2955
820.3
7
301.5
2949.5
818.5
8
299.5
2943
816.5
9
303
2948
817
10
302.5
2955.5
816
11
293.5
2956
822
12
294.5
2957
821
13
295
2958
814
14
296
2959
815
15
297
2960
814.5
16
298
2960.5
815.5
17
299
2958.5
821.5
18
303.5
2956.5
822.5
19
304
2960
830
20
305
2889
811
2