Cyclopedia of mechanical engineering; a general reference work. Editor-in-chief Howard Monroe Raymond. Assisted by a corps of mechanical engineers, technical experts, and designers of the highest professional standing (1908)
American School (Chicago, Ill.), Raymond, Howard Monroe · Chicago American Technical Society · leaf 155
-, both horizontal and vertical, is some-limes provided with more than one spindle. In small verticaldrills of this description, the spindles are fixed in their relative … positions and are not intended to be operated simultaneously;tiie work is passed from one spindle to another. The true multi-spindle drill is for the pm-pose of di-illing several holes at onetime and in any relative position within the limits of adjustmentof the machine. Such a drill is shown in…
Mechanical engineering
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