Design and fabrication of a flour milling machine

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DESIGN AND FABRICATION OF FLOUR MILLING MACHINE

CHAPTER ONE

INTRODUCTION

  • BACKGROUND OF THE STUDY

Milling machine is used for cutting the gear; the gear blank is mounted on the arbor which is supported between a dead centre and a live centre at the indexing head. The cutter is mounted on the arbor of the milling machine. The geometric centre of the cutter must be aligned exactly vertically with the centre line of the indexing head spindle. The table of the machine is moved upward until the cutter touches the periphery of gear blank. The vertical feed dial is set to zero. The table is then moved horizontally until the cutter clears the gear blank. The table is then moved upward equal to the full depth of the gear tooth. The vertical movement may be less if the gear is to be cut in two or more passes. After this, the longitudinal feed of the table is engaged. The gear blank moves under the rotating cutter and a tooth space is cut. At this stage, the movement of the table is reversed so that the cutter again clears the gear blank. The gear blank is then indexed to the next position for cutting the second tooth space. This procedure is repeated until all the teeth have been milled. The table frame, the motor mounting frame, the main frame mounting plate and the drive shaft are all made of mild steel because of its good properties of hardness and tough resistance. The inner surface of the table is made of galvanized mild steel which is hard, tough and corrosion resistant to avoid contamination of food during the production process of the food in the flour milling machine. To overcome the problem of the ancient use of concave stone, quern mill, norse mill of the 65BC and wind mill of the 11thand 12th centuries, a roller mill machine was on the increase and available to power the industries. Later, the demand for high speed white flour roller mills and refining system were developed toward the end of the 19th century. Basically, the flour milling machine with rollers enhances the flour (dough) when mixed in a large quantity which is used by some of the food industries for food processing i.e. bakery industries, biscuit industries and fast food making centers etc. The use of the flour milling machine by some of our food industries has increased the rate of their production and as well saved a lot of time in production process. In this research work, the machine will be modified from the old design which does not have the pinion drive gear; rather the speed reduction was done with an auxiliary gear box which is usually driven by an automotive engine of six horse powers. This modified machine uses the main drive shaft as means of speed reduction and these involves a big pulley of the main drive shaft being driven by a small pulley with the aid of electric motor. The pinion gear of the main drive shaft drives the big gear of the base which in turn drives the upper roller of the system. From these arrangements, there is an automotive speed reduction, therefore, the gear box system is unnecessary because of the inbuilt speed reduction arrangement. The machine is plugged directly to electricity (A/C) and can also be driven by an automatic system. The modification design will yield a compatible power supply, cheaper to install and maintenance cost is reduced.

1.2  STATEMENT OF THE PROBLEM

The problem confronting the study is the design and fabrication of flour milling machine

1.3 OBJECTIVE OF THE STUDY

The  objective of the study is the design and fabrication of flour milling machine

1.4  SIGNIFICANCE OF THE STUDY

The study proffers a prototype design and fabrication of flour milling machine

1.5 SCOPE OF THE STUDY

The study is focuses on the design and fabrication of flour milling machine

 1.6 LIMITATION OF THE STUDY

The study was confronted with logistics constraints.

1.7  DEFINITION OF TERMS

FLOUR MILLING MACHINES DEFINED

flour mill – a mill for grinding grain into flour. milling machinery, grinder, mill – machinery that processes materials by grinding or

DESIGN AND FABRICATION OF FLOUR MILLING MACHINE

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