Radial drilling machine is a heavy duty machine. It consists of a vertical column supporting a horizontal arm on which drill spindle can move in radial direction. The arm can be raised or lowered and swung around any position over the work. Two electric motors are used as shown in Figure 19.38, one used to provide movement to the arm and other is used to drive spindle of the drilling machine.
Figure 19.38 Radial Drilling Machine
Gang Drilling Machine
Gang drilling machine is used for mass production where a number of drilling operations are to be performed in sequence. Each drill head can be equipped with different types of drill bits. There may be 2–10 spindles. The construction of gang drilling machine is shown in Figure 19.39.
Figure 19.39 Gang Drilling Machine
Multi-spindle Drilling Machine
A multi-spindle drilling machine has a number of spindles driven by a single motor. All the spindles holding the drills can be used simultaneously. It can produce a number of parallel holes simultaneously. It is employed for a light work. The construction of multi-spindle drilling machine is shown in Figure 19.40.
Figure 19.40 Multi-spindle Drilling Machine
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