Page 103 - CITS - Fitter Trade Pactical - Volume - 2

FITTER - CITS

Too small a wrench will need a greater force to turn tap. Very large and heavy tap wrenches will not
give the feel required to turn the tap slowly as it cuts.

Position the tap in the chamfered hole vertically by ensuring the wrench in a horizontal plane.
Exert steady downward pressure and turn the tap wrench slowly in a clockwise direction to start the thread. Hold
the tap wrench close to the centre. (Fig 3)
Fig 2 Fig 3

When you are sure of starting of the thread, remove the tap wrench without disturbing the tap alignment.

Check and make sure the tap is vertical. Use a small try square for help. (Fig 4)

Place the try square in two positions, 90° to each other. (Fig 5)

Fig 4 Fig 5

Make corrections, if necessary. This is done by exerting slightly more pressure on the opposite side of the tap
inclination. (Fig 6)

Fig 6

Never apply side pressure without giving a turning motion to the tap.

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CITS : CG & M - Fitter - Exercise 30