PREFACE

            Our purpose of embarking on the construction of a project of this type is to present a vivid and understandable fact that if given the necessary supports, that we the youth and Engineers in potentials can move this country forward as regards to technological endeavours.

            Such as bird eye-view right from time immemorial has provide that a lot of time and money has been wasted without any reason.  Money in the sense that the nation has been spending the hand earned foreign exchange on importation of bench sharing machine from China, India and some parts of the western nations.

            Our roadside welding and fabrications technical who control half of the engineering productive capacity of this nation spend a lot of time cutting a plan street of metal with chisel without getting a uniform sharp cut, while some waste their time waiting for power supply to operate their cutting or sharing machine which is electrically powered.

            The motive of this project is to reduce time, suffering and material wastage by introducing and representing a modern exposition of a manual operated bench sharing machine through which metal sheets material can easily shear out without much suffering.

            Perhaps structural difference may exist between this machine compared to power shearing machine but its working principle is the same.  Though the main frame of the machine is formed by welding and filling, other methods such as casting and forging can be use to produce the main frame and also its component parts.

TABLE OF CONTENTS

CHAPTER ONE

Introduction                                                   

1.1       Metal shearing (lit review)                                         

CHAPTER TWO

2.1       Component parts of bench shearing machine            

(specification of problem)

2.2       Heat treatment of the blade                                                   

 CHAPTER THREE

3.1       Theory and analysis of problem                                 

3.2       Fabrication of bench shearing machine (sequence of operation        

3.3       Strength of component                                              

3.4       Machine mechanisms                                                 

CHAPTER FOUR

4.1       Cost analysis                                                              

4.2       Test and results                                                                      

4.3       Maintenance (precautions)                 

CHAPTER FIVE

5.1       Inference                                                                    

5.2       Recommendation (observation)                     

5.3       Conclusion                                                                 

CHAPTER ONE

            INTRODUCTION

            The production of bench shearing machines to reduce, alleviate and probably eliminate suffering, time, money, wastage of material and more especially the need for technological break through and self reliance has been a major concern of the federal government.

            Metal shearing and shaping has been a tiring problem in the society from time immemorial especially toward our loco-parcatesis. To help eradicate these problem this project write up has delved  into simplicities and construction of bench shearing machine that can use to cut upto 3mm sheet of mild steel plate with a treated blade made up of high carbon steel.

            The machine is manually operated with a long hurdle known as its effort.  The long length of the hurdle helps it to increase its output toward the work piece.  The material to be cut must be a low carbon material example mild steel, dead mild steel or aluminum alloys.

            Other things discussed in this thesis include the component parts of the bench shearing machine, design and construction (sequence of operation), problems encountered and maintenance of the machine to help he reader get acquainted with the work done.

1.1       METAL SHEARING

            LITERATURE REVIEW (LIT REVIEW)

            Several countries which has made an impact towards technological break through stated by cutting, shearing, filling and assembling metal parts inform of machine that could produce the desired component that is why a large portion of the training and skills of  workshop Engineer is devoted to the shaping of metal and stopping the process at the  proper time.

            In the workshop, most of the shaping involves shearing of metal sheets, usually the conception of shearing suggest clearing the substance apart with a chisel, know that is not the case, it rather involves the shearing action by the use of snipe for tin sheets.

            There are four different types of shearing metal sheets in the work shop this include;

1.02       GULLITONE:

            This is a big machine that can cut long ring of length in metal sheet which is normally powered by hydraulic, or mechanical drive (gear system) or by big for less pressure gullitone use in time sheets or paper gullitone.

1.03 BENCH SHEAR

            This is a manually operated machine that is usually mounted on a bench or table which produce an average force when the handle is forced downward to shear out metal sheet on its blade.

CHISEL

            This is a treated tool made of high carbon steel bar which is sharpened at one and for cutting or shearing of metal sheets with the held of harmmer blow at the other unsharpened end of it.

1.04     TINMAN’S SNIPE (STRAIGHT OR CURVED)

            This is a manually operated tool with a pivot closer to its blade chat moves uniformly to each other. This is use in shearing light metal sheet of about 0.1mm to 0.4mm in the template work.