1.1 Introduction
A hacksaw is a handheld device used to slice through materials like plastic tubing and metal funnels. Its cutting system is given by removable edges which include sharp teeth along their external edge. As a rule, a hacksaw comprises of a metal casing that takes after a descending confronting. A handle of plastic, wood, or metal is regularly joined to one end of the casing. The edge's closures highlight customizable pegs that can be fixed to anchor a sharp edge set up, and extricated to expel it. Hacksaw sharp edges are long, thin portions of solidified steel that element a line of teeth along their front line. Each finish of the edge is punched with a little gap that fits onto the saw edge's pegs. Most sharp edges extend long from ten to 12inches (25.4 to 30.48 cm), albeit six-inch (15.24 cm) edges can be acquired to fit littler hacksaw models.
As a prelude to other parts of this study, this chapter will discuss the background upon which this study was initiated, the statement of problems that led to this study, the Aim and Objectives of the study. Others are Significance of the study, Scope of work, Research hypothesis and questions, Limitations of the Study and Definition of technical terms.
1.2 Background of Study
The saw was one of the first great innovations of the Metal Age. It was developed with smelted copper, from which a blade could be cast. Many of the early copper saws have the general appearance of large meat-carving knives. Egyptian illustrations from about 1500 BC onward show the saw being used to rip boards, the timber being lashed to a vertical post set into the ground. Though there is no evidence of the type of saw used, Egyptians were able to saw the hard stone. The blade was probably toothless and rode on an abrasive material such as moistened quartz sand. The 7 1/2-foot granite coffer still in the Great Pyramid carries saw marks. During the Bronze Age, saws became much more widespread in woodworking. It was at this time that the modern form of the saw began to come into play. Some of the saws used resembled hacksaw blades of today. Iron saws started to be produced in the mid- 7th century BC.
While saws for cutting metal had been being used for a long time, noteworthy upgrades in life span and effectiveness were made in the 1880s by Max Flower-Nash. Clemson, an author of Clemson Bros., Inc of Middletown, New York, United States,. Clemson directed tests which included changing the measurements, states of teeth, styles of set, and variable warmth medications of cutting edges. Clemson guaranteed tremendous changes to the cutting capacity of edges and constructed a noteworthy mechanical activity fabricating hacksaw sharp edges sold under the exchange name Star Hack Saw. In 1898, Clemson was conceded US Patent 601947, which points of interest different changes in the hacksaw.
Therefore, in Nigeria where the research was carried out, the activities that was conducted is to fabricate an automated double hacksaw machine.
1.3 Statement of Problems
Investigation revealed that hacksaws can cut metal bars made of many different materials in a short time, but they have one major drawback: they can only cut two bars at a time. Metal rods need to be cut at a rapid rate for industries to achieve mass production. As a result, traditional single-frame hacksaws are unreliable, requiring advances in technology and design.
Present scenario of industry focuses on the high production rate with less consumption of resources. To achieve this we need to minimize idle time and machine time per unit. The two ways hacksaw blade machine improves those factors by reducing time per unit to increase the production. In present situation electrical as well as hydraulic operated machines are used but the output from them is not satisfactory as it has low cutting rate.
1.4 Aim and Objectives of Study
The aim of the study is to design and fabricate an automated double hacksaw machine. In achieving this aim, the following specific objectives were laid out as follows:
- To design an automatic double hacksaw cutting machine
- To construct a double hacksaw machine for cutting wood, metal, pipe, angle, channel, flat plates, rods and such other things.
1.5 Significance of Study
This study will be of immense benefit to researchers who intend to know more on this study and can also be used by non-researchers to build more on their research work. This study contributes to knowledge and could serve as a guide for other study.
1.6 Scope of Study
The scope of the research is focused on the design and fabrication of an automated double hacksaw machine.
1.7 Limitations of the Study
During the course of this study, many things militated against its completion, some of which are:
- Time Constraint: The time frame given to accomplish this project was very short due to school academic calendar and it was carried out under pressure which made the researcher not to implement some necessary features.
- Research material: availability of research material is a major setback to the scope of the study.
- Frequent power failure: This made the researcher append more money on fuel to ensure sustainable power.
- Financial Constraint: Insufficient fund tends to impede the efficiency of the researcher in sourcing for the relevant materials, literature or information and in the process of data collection.
1.8 Definition of Terms
Hacksaw: Hacksaw is a machine used for metal cutting ranging from transportable model to giant size machine.
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