This project seek to modify the existing cassava grating machine to make it to be self-feeding in operation, to make the operation of the machine easier, safer The existing processing techniques used in the production of cassava starch and cassava dough leaves much to be desired. There are difficulties in the grating of the cassava dough, since the conventional methods available is time consuming and labour intensive. In the modified design, two side hopper, belt drives, gears and pulley will be used to achieve the proposed self-feeding cassava grating machine, also changes will be made to the belts as a result of increasing the center distance due to the hopper that will be introduced and a more speed reducing gear or box will be incorporated. Cassava will be fed with the Machine through the hoppers to be made of metal sheet to the granting drum, which will rotate at a constant speed. This process will grate the cassava into cassava pulp. The chute is to be constructed of metal sheet and it will accept the pulp and send it out.

TABLE OF CONTENT

CERTIFICATION                                                                                                                 ii

DEDICATION                                                                                                                       iii

ACKNOWLEDGEMENT                                                                                                     iv

TABLE OF CONTENT                                                                                                         v

LIST OF FIGURES                                                                                                               viii

LIST OF TABLES                                                                                                                 ix

LIST OF SYMBOLS AND NOTATIONS                                                                           x

ABSTRACT                                                                                                                           xi

1.         INTRODUCTION

            1.1       Background                                                                                                    1

            1.2       Processing Cassava into various Products                                                     2                                                                                             

1.3       Statement of the Problem                                                                               4

1.4       Objectives of this Work                                                                                  5

1.5        Justification of the Work                                                                               5

2.         LITERATURE REVIEW                                      

            2.1       Background study of  Graters                                                                                    6

2.2       Traditional Manual Graters                                                                             6

2.3       Mechanized Graters                                                                                          8

2.4       Power Driven Horizontal Cylindrical Graters                                                  9

2.5       The  Wadwha   Disc Grater                                                                              12

2.6       Various Problems and Shortcomings of the Previous Design              14     

3.         METHODOLOGY        

            3.1       Design Consideration                                                                                        16                                                                   

3.2       General Description                                                                                           16

3.2       Operation Mechanism of the machine                                                               17

3.4       Description of the Machine parts                                                                      19

3.5       Materials Selection                                                                                            26

3.6       The Design Procedures                                                                                     26

3.6.1    Belt Design                                                                                                       27

3.6.2    Shaft Design                                                                                                     30

REFERENCES                                                                                                                        32

LIST OF FIGURES

Fig. 1.1            A Typical Cassava Processing Chain                                                                     3

Fig. 2.1            The Traditional Grater                                                                               7

Fig. 2.2            Pedal  Cassava Grater                                                                                            9

Fig. 2.3            The Power Driven Horizontal Grater                                                                   11  

Fig. 2.4            Engine Power Grater                                                                                             12

Fig 2.5             The Wadwha  Disc Grater                                                                                     13

Fig. 3.1            Side view of the proposed self-feeding cassava grating machine                         18

Fig  3.2            The main frame                                                                                                     19

Fig 3.3            The pressing element                                                                                              21

Fig 3.4            The isometric and side view of the grating drum                                                   22

Fig 3.5             Belt Drive                                                                                                              23

Fig 3.6             The pulley                                                                                                              24

Fig 3.7              Shaft coupling                                                                                                       25

LIST OF TABLES

Table 1.1          Cassava Production Area and yield by states                                                          4