Page 98 - CITS - Fitter Trade Pactical - Volume - 2

FITTER - CITS

Keep both elbows against the side.
Position yourself in such a way that the drill makes an angle of 59° to 60° to the wheel face. (Fig 2)

Fig 2

Hold the drill level. Twist it until one cutting edge is horizontal and parallel to the wheel face. (Fig 3)
Swing the shank of the drill slightly downwards and to the left with the left hand. The right hand is on the tool-rest.
(Fig 4)

Fig 3 Fig 4

Watch the cutting edge against the wheel. Note that, as the shank, swings down, the cutting edge comes slightly
upwards and away from the wheel face. (Fig 5)

Fig 5

Apply a slight foward motion to your hands.
This will bring the flank of the point against the wheel to produce a lip clearance.

Coordinate the three movements of swinging down, twisting clockwise and forward movement.
These movements should not be heavy movements. If they are performed correctly, they will
produce a cutting edge that has the correct lip clearance and cutting angle.

Practice these movements against a stationary wheel, using a new or correctly sharpened drill.

Notice how only a small movement is required to produce the required clearance.

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CITS : CG & M - Fitter - Exercise 29 CITS : CG & M - Fitter - Exercise 29