CHAPTER ONE
1.0 INTRODUCTION
The project titled fabrication of machine is used for grinding domestic food stuff like corn, pepper, beans, tomatoes, melon
e.t.c. The grinding operation was carried out in the olden days with the aid of grinding stone. This method is very tedious and unhygienic in nature. The particle of the grinding stone can easily be mixed with the grinding food items which may be hazardous to the food itself and also to the personnel undertaken such task by entering his or her body. It takes a lot of time and energy during operation (wwwcrushermachine.com).
Pepper grinding machine was fabricated purposely to overcome all the challenges which may be encountered when grinding using this primitive method. It can also be used for commercial purpose. Some of the machines were made to be operated manually. With this type of machine, series of labour is been done and a lot of energy been wasted in undergoing such task.
The advent of advanced technology has introduced a new dimension into this kind of grinder, which overcome the problem of hard labour and energy wasted with the use of the electrically operated grinding machine.
1.1 AIMS
The aim of the project is to fabricate pepper grinding machine to eliminate the olden methods of grinding. Electrical power grinder was put into the construction in order to ease the labour directed to the process of grinding and to limit time taken in the operation process.
1.2 OBJECTIVE
1.    To assess student interest and suitability in their respective career.
2.    To afford students the opportunity of relating the theoretical class works with the actual industrial life.
3.    To reduce the time taken and energy required during grinding operation.
1.3 UNITS OF A GRINDING MACHINE
The grinding mill is divided into four main units namely
I.    The hopper unit
II.    The crushing unit
III.    The power unit
IV.    The collection unit
1.3.1 THE HOPPER UNIT
The hopper unit houses the food stuff to be grinded and guide the items in an hygienic manner to the crushing unit.
1.3.2 THE CRUSHING UNIT
The crushing unit consists of a space housing the shaft on which it is welded in a helical profile. When this shaft rotate, the welded helical profile move and crushes the food. The crushing staff converges the crushed food into the grinding pepper machine of the two discs.
One of the discs in the grinding units is stationary while the other rotates with the shaft in the crushing section. It is at this unit that the food is been grinded to fine particles. A ball bearing is incorporated and a screw ceases structure in other to contro’ the grinding efficiency of the disc.
1.3.3 THE POWER UNIT
An electric motor is fixed to the machine which helps to transmit output torque through a belt drive connected to the crushing shaft when the motor is on the shaft and have the operation of grinding machine.
1.3.4 THE COLLECTION UNIT
This is the point at which the grinded items would be collected after undergoing grinding processes.
1.4 LITERATURE REVIEW
Grinding process was accomplished in the dark ages: by the use of grinding stone which is carved out from rocks and carved into a desired shape and size. This takes a lot of time and requires a lot of energy used in grinding stone. Due to technological advancement, the electric pepper grinder was invented in which the electric motor drives the grinding disc with the aid of the belt and pulley. The main focus of the project is just to minimize the time and energy consumed when grinding the food stuffs.