Sunday, 20 September 2020

What is the use of a drilling’s and where we use drilling?

Drilling’s is a process of producing round holes in a solid material or enlarging existing holes with the use of multi tooth cutting tools called drilling.

Drilling tool path

Basic operations:

  1. Drilling
  2. Reaming
  3. Tapping
  4. counter boring
  5. Spot facing
  6. Center drilling
  7. Grooving
  8. Trepanning

Machines used:

  • Bench drilling: Drilling diameter up to 8 mm.
  • Pillar drilling: Higher capacity up to 20 mm.
  • Radial drilling: Higher capacity up to 50 mm(drilling spindle bought to position of work piece).
  • Gang drilling: Group of bench drilling machine.

Multi spindle drilling:

  • Two are more spindles are operated by common drive by means of universal joints and telescopic spindle shaft’s.
  • Some machines the spindle moves down wards while other table moves upwards.
  • Usually spindles are arranged in pattern of ¬†multiple drilling done on one or more work piece.
  • Advantage for large volume of production.
  • Good positional accuracy of parts ensured.

Drilling tool magzines

Center drill:

  • Used for making center holes in component.
  • Use for centering the ends of the work.
  • Used for positioning the location of hole before drilling further.
  • Single ended / Double ended.


  1. TYPE A : For ordinary type of work.
  2. TYPE B : Parts to be machined are to pass through a number of subsequent hand lings.
  3. TYPE R : Avoid errors of misalignment between center.