Page 48 - CITS - Fitter Trade Practical - Volume -2

FITTER - CITS

Fig 2

Fix the tap wrench on the square end and place the reamer vertically in the hole. Check the alignment with a try
square. Make corrections, if necessary. Turn the tap wrench in a clockwise direction applying a slight downward
pressure at the same time (Fig 3). Apply pressure evenly at both ends of the tap wrench.

Apply cutting fluid.
Turn the tap wrench steadily and slowly, maintaining the downward pressure.

Fig 3

Note: Do not turn in the reverse direction it will scratch the reamed hole. (Fig 4)

Fig 4

Ream the hole through. Ensure that the taper lead length of the reamer comes out well and clear from the bottom
of the work. Do not allow the end of the reamer to strike on the vice.
Remove the reamer with an upward pull until the reamer is clear of the hole. (Fig 5)

Fig 5

Remove the burrs from the bottom of the reamed hole.
Clean the hole. Check the accuracy with the cylindrical pins supplied.

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CITS : C G & M - Fitter - Exercise 62