Page 58 - CITS - Fitter Trade Practical - Volume -2

FITTER - CITS

EXERCISE 63 : Drill through and blind holes at an angle
using swivel table of drilling

Objectives

At the end of this exercise you shall be able to
• file surface and right angle and check with try square
• file to size maintaining accuracy 0.02mm
• align the job for angular drilling
• drill angular through hole
• drill angular blind hole.

Job sequence

• Check the raw material for its size.
• Mark the required size and cut by hacksawing.
• File to size 75x24x24mm and check with vernier caliper.

• Mark the given dimension for drilling location as per size by using vernier height gauge.
• Punch on correct locations of drills
• Hold the work piece in the machine horizontally by keeping the parallel blocks under the work piece to avoid
drill bit tip touch the metal base of machine vice.
• Check with spirit level.
• Clamp the machine vice to the drilling machine universal table.
• Lock and arrest the table rotation in ‘z’ axis.

• Tilt the drilling machine table at an angle of 15°, lock it, and drill hole to the required depth.
• Align the spindle centre and hole location using locating pin.

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