2. Sketch a radial drilling machine? Explain the working, advantages and disadvantages of a radial drilling machine.
Radial drilling machine:
A radial drilling machine is illustrated in Fig. below. This is really meant to drill holes in bigger and heavier workpieces, which cannot be manipulated so that the centre of the hole may be aligned with the drilling spindle. In this case, the drilling head is mounted on a radial arm. The radial arm can be rotated around the round column and the drilling head can be moved in or out on the radial arm.
The work piece is kept on the table which is really an integral part of the base and by the combined movement of the radial arm and the drilling head (think of the polar coordinates θ, r), any point on the work piece can be covered and a hole drilled at the required location, without shifting the heavy work piece
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