ITI Bangla

  Importance of safety and general precautions observed in the industry/shop Floor Generally accidents do not happen; they are caused. Most accidents are avoidable. A good craftsman, having a knowledge of various safety precautions, can avoid accidents to himself and to his fellow workers and protect the equipment from any damage. To achieve this, it is essential that every person should follow safety procedure. (Fig 1) Safety in a workshop can be broadly classified into 3. categories. • General safety •Personal safety Machine safety General safety Keep the floor and gangways clean and clear. Move with care in the workshop, do not run. Don't leave the machine which is in motion. Don't touch or handle any equipment/ machine unless authorised to do so. Don't walk under suspended loads. Don't cut practical jokes while on work. Use the correct tools for the job. Keep the tools at their proper place. Wipe out split oil immediately. Replace worn out or damaged tools immediate...

        Types of Marking Punch Punches are used in order to make certain dimensional features of the layout permanent. There are two types of punches. They are centre punch and prick punch made of high carbon steel , hardened and ground. Centre Punch : The angle of the point is 90° in a centre punch. The punch mark made by this is wide and not very deep. This punch is used for locating centre of the holes . The wide punch mark gives a good seating for starting the drill. (Fig 1a ) Prick Punch/Dot punch : The angle of the prick punch is 30° or 60°. (Fig 1b) The 30° point punch is used for making light punch marks needed to position dividers. The divider point will get a proper seating in the punch mark. The 60° punch is used for marking witness marks and called as dot punch. ( Fig 2)