Page 64 - Turner 1st sem Practicals

Job sequence

TASK 1 : Marking I

• Check the raw material for its size. • Rotate the round rod and set to vertical position of
scribing line with help of try square and mark centre
• Apply marking media on one side of the job and allow point.
it to dry.
• Scribe the horizontal line away 12mm from centre point.
• Place the round rod on 'V' block.
• In the same way to mark other three sides.
• Scribe the centre line of the round rod.
• Punch witness mark of four sides of marking line.

TASK 2 : Marking II

• Apply the marking medium.
• Scribe the centre lines and parallel lines to the edges
'x' and 'y'. (Fig 1)

• Punch centre marks on all the four circles.

• Draw all the four circles using a divider.
• Draw R8 and R10 curves a little more than the length
required.
• Draw two tangents close to the edges of the 'x' and
• Set 97° on the bevel protractor. circles using a steel rule and scriber. (Fig 2)
• Mark 97° line through point '0' and get the centres of the • Punch witness marks.
other two circles. (Fig 2)

52 Producltion & Manufacturing : Turner - Exercise 1.2.18