Page 50 - Turner 1st sem Practicals

Job sequence

TASK 1 : Layout marking

Marking
• Check the raw material for its size and its squareness.
• Apply prussian blue on one side of the job end and allow
it to dry.
• Scribe parallel lines to the edges 'x' and 'y' using a
surface gauge.
• Draw the horizontal and vertical lines as per drawing.
(Fig 1)

To avoid confusion, do not scribe the line
longer than necessary.

• Scribe two lines by joining points 'ab' and 'cd' using a
steel rule and scriber. (Fig 2)
• Punch witness marks and complete 'Z'.
• Place the dot-punch in position; while doing so, rest
your hand on the workpiece. (Fig 3)
• Set the dot-punch upright.
• The dot-punch is struck with the hammer; the blow
must be delivered in the direction of the dot-punch axis.
(Fig 4)

TASK 2 : Hacksawing differnet material

• Check the material to size. • Secure the job in the vice.
• File and remove the burrs from the edges. • Select the blade of correct pitch and fix the blade to the
hacksaw frame.
• Apply marking media only where marking is required.
• Select coarse pitch blade for solid metal and fine pitch
• Mark the cutting line by a scribing block and a steel rule.
blade for conduit tubes pipes and thin metal sections.

38 Producltion & Manufacturing : Turner - Exercise 1.2.13