Page 54 - CITS - Fitter Trade Practical - Volume -2

FITTER - CITS

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)

Fig 4

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

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

Note: Never apply side pressure without giving a turning motion to the tap.
Check the tap alignment again with a try square.

Fit the tap wrench, and tighten without disturbing the tap alignment.
Make one or two turns and check the alignment.
The tap alignment should be corrected within the first few turns. Afterwards this cannot be done for the threads
will break.
After the tap is positioned vertically, turn the wrench lightly by holding the ends of the wrench handles without
exerting any downward pressure. (Fig 7)

39

CITS : C G & M - Fitter - Exercise 62