The taper shank drills are held on the machine by means of:

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RRB ALP Mechanic Diesel 21 Jan 2019 Official Paper (Shift 1)
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  1. chucks
  2. sleeves
  3. drift
  4. vice

Answer (Detailed Solution Below)

Option 2 : sleeves
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Explanation:

Taper shank drills:

  • Taper shank drills have a morse taper.
  • Sleeves and sockets are made with the same taper so that the taper shank of the drill.
  • When engaged, it will give a good wedging action.
  • Due to this reason, morse tapers are called self-holding tapers.
  • The taper shank drills are held on the machine by means of sleeves.
  • Drills are provided with five different sizes of morse tapers and are numbered from MT1 to MT5.
  • In order to make up for the difference in sizes between the shanks of the drills and the type of machine spindles, sleeves of different sizes are used.
  • When the drill taper shank is bigger than the machine spindle, taper sockets are used.
  • While fixing the drill in a socket or sleeves the tang portion should align in the slot.
  • This will facilitate the removal of the drill or sleeve from the machine spindle.
  • Drift is used to remove the drills and sockets from the machine spindle.

  

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