Difference between revisions of "Skill-Development--Fitter/C2/Filing-a-workpiece/English-timed"
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Revision as of 11:29, 12 January 2015
| 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 | First let's 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 3 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 or ink as a marking medium. |
| 02:08 | Once the medium is applied, mark the work-piece using a jenny calliper, 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 calliper. |
| 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 calliper. |
| 06:33 | Place the work-piece within the jaws of the Vernier calliper, 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 |
| 07:20 | The video at the link shown summarises the Spoken Tutorial project. Please download and watch it. |
| 07:27 | The Spoken Tutorial Project Team conducts workshops and gives certificates to those who pass our online test. |
| 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. |
