Skill-Development--Fitter/C2/Filing-a-workpiece/English-timed

Time	Narration
00:00	Hello and welcome to the Spoken Tutorial on Filing a Workpiece
00:07	In this tutorial, we will learn,
00:10	What is filing?
00:12	Various tools used for filing
00:15	Different types of filing
00:17	How to file a workpiece
00:22	And common mistakes while filing
00:24	For this tutorial we require
00:27	A file
00:28	The workpiece to be filed
00:31	Bench Vice to hold the workpiece
00:34	Vernier Calliper to measure
00:37	Try Square to check the workpiece's squareness
00:42	Hack saw to cut the workpiece
00:45	Punch to mark on the workpiece
00:48	And a Ball pein hammer
00:51	Let's first see, what is filing.
00:54	Filing is a method of removing excess material from a job or a workpiece using a file.
01:02	There are various types of files for various requirements
01:07	Flat file, for rectangular cross-section
01:11	Smooth file : for getting smooth surfaces
01:15	Safe edge file : for filing the right angled part of the workpiece
01:21	Square file : for developing square corners & square holes
01:27	Half run file : for filing semi-spherical surfaces
01:32	And Round file : for developing holes & round groves.
01:38	Let’s us now learn the filing process.
01:41	My requirement is a 5 by 4 inch workpiece.
01:46	The job or the work-piece which I have is 5 by 4 inches.
01:52	So let us first cut the excess 1 inch part.
01:58	For this, apply the marking medium on the work-piece.
02:03	You can use a chalk piece or ink as a marking medium.
02:08	Once the medium is applied, mark the work-piece using a jenny caliper, as shown.
02:15	So, I am marking a little less than 1 inch according to my requirement.
02:21	Next, use a punch and ball pein hammer to punch on the marked line.
02:28	After this, place the work-piece parallel to the jaws of the Vice.
02:34	Now tighten it to hold the work-piece in place.
02:38	This is so that we can cut the work-piece easily.
02:42	Next, take the hack saw and cut the excess portion of the work-piece.
02:48	Once the excess part is removed, measure the work-piece once again.
02:54	Yes, the measurement is proper now. I have 5 by 3 inches .
03:00	Now, let’s start filing.
03:02	First we have to select a suitable file.
03:06	I need a smooth edge, so I will choose the Smooth file.
03:11	Make sure that the handle of the file is securely fitted.
03:16	Do not use a file without a proper handle.
03:19	You will end up injuring your hands.
03:22	Make sure that the file is clean before you start filing.
03:27	Using rusted files will damage the work-piece as well as bruise your hands.
03:34	So, now I have selected the proper file.
03:38	Next step is to place the work-piece securely in the Bench vice once again.
03:45	Position yourself at 90 degree perpendicular to the Bench vice.
03:51	Place your left leg in the front & right leg at the back.
03:57	This is the best position for filing.
04:00	Now hold the handle of the file firmly in your right hand.
04:05	With your left hand, hold the tip of the file as shown.
04:10	Ensure that, the right thumb is pressing the handle of the file firmly.
04:15	Now we are ready to start filing.
04:18	There are three methods of filing. They are :
04:21	Straight forward filing
04:23	Draw filing
04:25	Diagonal or cross filing.
04:28	Let’s see them one by one.
04:30	Moving the file lengthwise across the surface of the work-piece is called Straight forward filing.
04:38	In this method, the filing is done by moving the file up & down slowly.
04:44	You can see that your work-piece is getting filed and the excess material is being removed.
04:51	In Draw filing method, the file is pulled towards the body with an even pressure.
04:58	In Diagonal filing method, the file is moved diagonally over the surface of the work-piece.
05:06	The movement of the file is from one corner of the work-piece to another, diagonally.
05:13	Once the filing is done, we have to check the flatness & squareness of the work-piece surface.
05:21	This is done with the help of Try-Square & Vernier caliper.
05:26	To check whether the flatness is proper, place the Try-square on the work-piece as shown.
05:33	Do so at 3 different places on the work-piece.
05:38	Check this against a light source.
05:41	This is a clear indication of flatness.
05:44	If the surface is uneven, then you will see light rays between the work-piece and the Try-square.
05:52	In such cases, you will need to file again.
05:57	Next we will check the squareness of the work-piece by using the Try-square.
06:03	Keep the Try-square on the corner of the work-piece, as shown.
06:07	Now touch the edges of the Try-square on two adjacent sides of the work-piece, like this.
06:14	Check whether the adjacent sides of the work-piece are at 90 degrees to each other.
06:20	If not, then file again.
06:23	Another measurement that we need to do is to check the thickness of the work-piece.
06:29	For this, we have to use a Vernier caliper.
06:33	Place the work-piece within the jaws of the Vernier caliper, as shown.
06:38	Measure the thickness of the work-piece.
06:41	Now repeat this at least on three different locations on the work-piece.
06:47	Identical measurement indicates that the work-piece is even in thickness.
06:53	Now its time to learn what not to do while filing.
06:57	Do not file a work-piece at an angle
07:00	Do not file a work-piece at both the edges skipping the centre.
07:05	With this we come to the end of this tutorial.
07:08	Let us summarise, In this tutorial, we have learnt
07:12	To Measure a workpiece
07:14	Remove the excess part of the workpiece
07:17	File a workpiece
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07:35	For more details, please write to us.
07:38	Spoken Tutorial Project is supported by the NMEICT, MHRD, Government of India.
07:45	More information on this Mission is available at this link.
07:51	This tutorial has been created exclusively for the National Instructional Media Institute, Chennai
07:59	The script for this tutorial has been contributed by Praveen and
08:03	This is Nancy Varkey from IIT Bombay signing off.
08:07	Thanks for joining us.

Contributors and Content Editors

PoojaMoolya, Pravin1389