Aspects of this topic are discussed in the following places at Britannica.
A gang-drilling machine consists of several individual columns, drilling heads, and spindles mounted on a single base and utilizing a common table. Various numbers of spindles may be used, but four or six are common. These machines are designed for machining parts requiring several hole-machining operations, such as drilling, countersinking, counterboring, or tapping. The workpiece is moved...
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