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Metal Shop Tools and Measurements Notes: Certificate/Diploma in Electrical Engineering

Institution: College

Course: Certificate/Diploma in Electrical Engineering

Content Category: Class Notes

Posted By: 6611588

Document Type: DOCX

Number of Pages: 25

Price: KES 70

Views: 916 Downloads: 6

Summary

TOPIC 2: METAL SHOP TOOLS AND MEASUREMENTS
Hand processes
•Hand tools are used to remove small amounts of material, usually from small areas of the work piece. This may be done because no machine is available, the work piece is too large to go on a machine, the shape is too intricate or simply that it would be too expensive to set up a machine to do the work.
•Since the use of hand tools is physically tiring, it is important that the amount of material to be removed by hand is kept to an absolute minimum and that the correct tool is chosen for the task. Wherever possible, use should be made of the available powered hand tools, not only to reduce fatigue but also to increase the speed of the operation and so reduce the cost.
• Common hand tools used in an engineering workshop include:
1. File (Engineer’s File)
2. Hacksaw
3. Cold chisel
4. Scrappers
5. Engineer’s hammer
6. Screw drivers
1. Engineer’s files
Files are used to perform a wide variety of tasks, from simple removal of sharp edges to producing intricate shapes where the use of a machine is impracticable. They can be obtained in a variety of shapes and in lengths from 150 mm to 350 mm. When a file has a single series of teeth cut across its face it is known as single-cut file, and with two sets of teeth cut across its face it is known as double-cut file,
The grade of cut of a file refers to the spacing of the teeth and determines the coarseness or smoothness of the file. Three standard grades of cut in common use, from coarsest to smoothest, are bastard, second cut and smooth. In general, the bastard cut is used for rough filing to remove the most material in the shortest time, the second cut to bring the work close to finished size and the smooth cut to give a good finish to the surface while removing the smallest amount of material.
Hand file: The hand file is for general use, typically on flat surfaces. It is rectangular in cross-section, parallel in width along its length, but tapers slightly in thickness for approximately the last third of its length towards the point. It is double-cut on both faces, single-cut on one edge.
and is plain on the second edge. The plain edge with no teeth is known as the “safe? edge and is
designed to file up to the edge of a surface without damaging it. The taper in thickness enables
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Metal Shop Tools and Measurements Notes: Certificate/Diploma in Electrical Engineering

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