Page 117 - Turner 1st sem Practicals

Job sequence

• Check the raw material. • Punch the witness mark of the square.
• Hold the job in 4 jaw chuck and face the end. • Hold the job in 4 jaw chuck in vertical position.

• Calculate the maximum size of the square possible the • Set witness mark to parallel of the chuck face and face
in given round rod. the job.
• Reset and face the other end and maintain total length • Follow the same procedure for other sides.
of job to 56 mm and remove the job from chuck.
• Maintain the measurement side of the square is 56 mm.
• Set the job in 'V' block and mark centre line of the job
with help of vernier height gauge. • Make centre drill, pilot drill and 18 mm drill
simultaneously.
• Rotate the job to set vertical position of centre line with
help of try square. • Enlarge the hole by boring to 20 mm and step bore
φ 30 x 30 mm length.
• Set vernier height gauge 28 mm above the centre line of
the job. • Cut groove as per drawing with help of grooving tool.
• Scribe the horizontal line. • Check the dimensions.
• Follow the same procedure for marking other sides.

Skill sequence

Making square block from round bar in lathe.

Objective: This shall help you to
• mark the square in round rod
• bore and recess.

Check the raw material. (Fig 1)

Set the job. (Fig 2)

Face one end of the job. (Fig 3)
Face the other end and length is equal to side of the square
(Fig 4).

104 Producltion & Manufacturing : Turner - Exercise 1.3.34