What is Fitting-Workshop Practice-Presentation, Slides for Mechanical Engineering. Aligarh Muslim University
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What is Fitting-Workshop Practice-Presentation, Slides for Mechanical Engineering. Aligarh Muslim University

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This presentation was delivered at Aligarh Muslim University for the purpose of Mechanical Engineering workshop. It includes: Fitting, Preparing, Matching, Parts, Filling, Marking, Drilling, Reaming, Dieing, Tapping, Saw...
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Presentation

Introduction

What is Fitting:

Fitting means preparing matching parts to touch or join each other in such a way that one will turn

inside of another and one will slide upon another

or the part hold tightly together.

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Processes in the Fitting Shop

 Filing

 Marking & Measuring

 Sawing

 Drilling

 Reaming

 Dieing

 Tapping

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Fitting Shop Tools

Classification:

 Marking, measuring and testing tools

 Cutting tools

 Holding tools

 Striking tools

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Marking, measuring and Testing tools

This type involves steel rule, meter rod,

trisquare, scribber, divider, calliper, surface

guage, drill guage, combination set, V

Block, surface plate

Cutting Tools This type involves files, drills, taps, dies,

reamers, hack saw, chizzles.

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Holding Tools This type involves tools holding devices.

Examples are bench vise, machine vise,

pipe vice, leg vice and hand vise.

Striking Tools

This type involves tools as ball peen hammer, cross peen hammer and

flat\straight hammer

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Processes

Filing

Cutting of a metal surface by using a specially designed tool, called a

file. A file (or hand-file) is a hand tool used to shape material by abrasion.

Classification of files  Shape (Flat, round, square etc )

 Grade (Rough, Bastard, Smooth etc)

 Cut (Single cut, Double cut, Rasp cut etc)

 Length ( Ranging from 4-18’’)

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Files have forward-facing cutting teeth, which means

that the file cuts effectively only when pushed over the

work piece. Pulling a file over a work piece or

scraping a file back and forth is ineffective and will

reduce the life of the file.

The grooves in a file may become clogged during

use, causing the file to lose its cutting ability.

Files should always be used with a handle,

otherwise the naked tang can injure the operator.

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Marking

& Measuring

Marking is done on the job to locate the exact point

where we have to carry out some other processes

like sawing, drilling etc.

In fitting shop marking is carried out with some

specified tools such as scribber, punches, hammer

etc.

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The surface of the work piece is painted with lead oxide

(brown) and scribber is used to scribe marking lines on the

job. Marking line should not be more than .2mm wide

Then punching is done using punches and hammers.

Punching is done to locate the position for holes to be

drilled.

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Using specified tools measuring is done to check the

accurate dimensions of the W.P.

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Sawing A saw is a tool for cutting wood or other material. it

consist of a blade with the cutting edge toothed. The teeth of the saw are each bent to specific angle and this angle is called "set".

TYPES OF SAW Hand saws: Hand saw is used manually for cutting

operations.

Mechanically powered saw: Mechanically powered saws mechanically move the teeth past the material while the saw itself is held stationary.

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Sawing

Sawing is done to produce thin cuts.

Hack Saw is a chief tool used, which is available in different types and sizes depending on the length of the blade and its cuts.

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Sawing

Normal dimensions of a blade = 250x12 mm2

Hacksaw teeth are specified by its pitch

( pitch=distance b/w two successive troughs or

crusts.)

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Sawing Pitch of the teeth should give maximum clearance for

the chips and avoid clogging.( Normal pitch =

1.5mm)

Sawing too sharply over a corner will result in teeth

being torn off.

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Drilling

Drilling

Machine

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Drilling Process

 What is a Drill? A tool or machine with a pointer for making

holes of different diameter.

(Hand Drill)

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Instruments Use for Drilling

1. Drill Chuck

2. Drill Chuck Key

3. Drill Drift

4. Sleeve OR Socket

5. Shank Twist Drill

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STEPS OF DRILLING

Step 1. Use a scribe to scratch a line on

piece where we wanted hole.

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Step2. Use a center punch and a hammer

to mark the spot because the punch

mark will hold the tip of the drill in place

until it begins to cut the metal.

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Step 3. Drilling deep or large holes, it is

best to drill a small reference hole first.

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Step 4. We will find a burr on the back surface of

drill hole. This can be removed by lightly drilling

the back side of the hole.

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REAMING

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Reaming Process

 What Is Reaming? Reaming is a process which slightly enlarges a pre-existing

hole. Several cutting edges are arranged around a central

shaft. Its purpose is to finish the internal diameter of the hole.

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Parts of Reamer

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REAMING

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