Page 95 - Turner 1st sem Practicals

Rotate the chuck by hand and observe the gap.
Engage the spindle levers at about 250 rpm and run the
machine.

Give slight pressure on the top of the pointer to make the
Adjust the pointer to make its tip move close to the top or tip to touch the work, and feel.
side portion of the work with a minimum gap. (Fig 4)
If the feel of contacting the pointer tip is uniform, it indicates
that the work is trued.
If the ‘feel’ is not uniform tighten the jaw where the feel is
high.

Repeat till a uniform feel is felt.
Finally, tighten the opposite jaws with the same amount
of pressure.

Check once again for the true running of the work.

Rotate the chuck by hand and observe the gap between
the pointer and work surface for the position of the two
opposite jaws.
Open the jaw slightly where the gap is more, and tighten
the opposite jaw. (Fig 5)
Repeat until the gap is the same. (Fig 6)
Repeat the above sequences for the other set of opposite
jaws.
Bring the pointer tip closer to the work surface.

Producltion & Manufacturing : Turner - Exercise 1.3.27 83