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Revision as of 15:23, 5 January 2015

Title of script: Filing a work-piece

Author: Praveen S

Keywords:


Visual Cue
Narration
Slide Number 1

Title Slide

Hello and welcome to the Spoken Tutorial on Filing a Workpiece
Slide Number 2

Learning Objectives


In this tutorial, we will learn,


  • What is filing?
  • Various tools used for filing
  • Different types of filing
  • How to file a workpiece and
  • Common mistakes while filing


Slide Number 3

Tools Requirement

For this tutorial we require


  • A file
  • The workpiece to be filed
  • Bench Vice to hold the workpiece
  • Vernier Calliper to measure
  • Try Square to check the workpiece's squareness
  • Hack saw to cut the workpiece
  • Punch to mark on the workpiece
  • Ball pein hammer


Slide Number 3

What is Filing?

Let's first see, what is filing.


Filing is a method of removing excess material from a job / workpiece using a file.

Slide Number 4

Types of File

There are various types of files for various requirements :


  • Flat file : for rectangular cross-section
  • Smooth file : for getting smooth surfaces
  • Safe edge file : for filing the right angled part of the workpiece
  • Square file : for developing square corners & square holes
  • Half run file : for filing semi-spherical surfaces
  • Round file : for developing holes & round groves.


Animation – Measuring the workpiece Let’s us now learn the filing process.


My requirement is a 4 x 4 inch workpiece.


The job or the work-piece which I have is 4 x 5 inch.


So let us first cut the excess 1 inch part.

Animation – Applying the marking medium on the workpiece. For this, apply the marking medium on the work-piece.


You can use a chalk piece or ink as a marking medium.

Animation – Marking on the workpiece Once the medium is applied, mark the work-piece using a jenny caliper, as shown.


So, I am marking a little less than 1 inch according to my requirement.

Animation – Punching over the marked line Next, use a punch and ball pein hammer to punch on the marked line.
Animation - Place the work-piece in Vice Jaws After this, place the work-piece parallel to the jaws of the Vice.


Now tighten it to hold the work-piece in place.


This is so that we can cut the work-piece easily.

Animation – Cutting the excess part with Hacksaw Now, take the hack saw and cut the excess portion of the work-piece.
Animation – Measuring the cutted workpiece Once the excess part is removed, measure the work-piece once again.


Yes, the measurement is proper now. I have roughly 4X4 inch.


Now, let’s start filing.

Show all the files


Circle the Smooth file.

First we have to select a suitable file.


I need a smooth edge, so I will choose the Smooth file.

Point arrow to Handle Make sure that the handle of the file is securely fitted.
Show a file without handle


Show some hand injuries

Do not use a file without a proper handle.


You will end up injuring your hands.

Show a clean file and a rusted file. Make sure that the file is clean before you start filing.
Show a rusted file

Show some hand injuries

Using rusted files will damage the work-piece as well as bruise your hands.
So, now I have selected the proper file.
Animation - Show the standing position Next step is to place the work-piece securely in the Bench vice once again.
Show the position of the person Position yourself at 90 degree perpendicular to the Bench vice.


Place your left leg in the front & right leg at the back.


This is the best position for filing.

Animation - Show the hand position Now hold the handle of the file firmly in your right hand.


With your left hand, hold the tip of the file.


Ensure that, the right thumb is pressing the handle of the file firmly.


Now we are ready to start filing.

Slide 5

Methods of filing

There are three methods of filing. They are :


  • Straight forward filing
  • Draw filing
  • Diagonal or cross filing.

Let’s see them one by one.

Animation - Straight forward filing Moving the file lengthwise across the surface of the work-piece is called Straight forward filing.


In this method, the filing is done by moving the file up & down slowly.


You can see that your work-piece is getting filed and the excess material is being removed.

Animation - Draw filing In Draw filing method, the file is pulled towards the body with an even pressure.
Animation - Diagonal/cross filing In Diagonal filing method, the file is moved diagonally over the surface of the work-piece.


The movement of the file is from one corner of the work-piece to another, diagonally.

Text on screen “Flatness” “Squareness”


Once the filing is done, we have to check the flatness & squareness of the work-piece surface.
Show Try-Square & Vernier calliper.


This is done with the help of Try-Square & Vernier caliper.
Animation - Checking the flatness of the work-piece To check whether the flatness is proper, place the Try-square on the work-piece as shown.


Do so at 3 different places on the work-piece.

Animation of checking against a light source


No light rays

Check this against a light source.


This is a clear indication of flatness.

Animation of checking against a light source


Some light rays emitting

If the surface is uneven, then you will see light rays between the work-piece and the Try-square.


In such cases, you will need to file again.

Next we will check the squareness of the work-piece by using the Try-square.
Animation of Try-square on corner of the work-piece Keep the Try-square on the corner of the work-piece, as shown.
Animation of Try-square touching the sides of the work-piece Now touch the edges of the Try-square on two adjacent sides of the work-piece, like this.
Previous frame continues Check whether the adjacent sides of the work-piece are at 90 degrees to each other.


If not, then file again.

Show the thickness edge of the work-piece.


Show a Vernier calliper

Another measurement that we need to do is to check the thickness of the work-piece.


For this, we have to use a Vernier caliper.

Animation of Vernier calliper measurement Place the work-piece within the jaws of the Vernier caliper, as shown.


Measure the thickness of the work-piece.


Now repeat this at least on three different locations on the work-piece.


Identical measurement indicates that the work-piece is even in thickness.

Now its time to learn what not to do while filing.
Show the animation of filing at an angle Do not file a work-piece at an angle
Show the animation of filing on both edges and skipping the central part Do not file a work-piece at both the edges skipping the centre.
Slide Number 8

Summary

Let us summarise,

In this tutorial, we have learnt

  • Measure a workpiece
  • Removing the excess part of the workpiece
  • Filing the workpiece


Slide Number 9

About Spoken Tutorial Project

The video at the link shown summarizes the Spoken Tutorial project. Pls watch it.



Slide Number 10

About Spoken Tutorial workshops

The Spoken Tutorial Project Team conducts workshops and gives certificates to those who pass an online test.


For more details, please write to us.

Slide Number 11

Acknowledgement

Spoken Tutorial Project is supported by the NMEICT, MHRD, Government of India.


More information on this Mission is available at this link.

The script for this tutorial is contributed Praveen and


This is Nancy from IIT Bombay signing off.


Thanks for joining us.

Contributors and Content Editors

PoojaMoolya, Pravin1389

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