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 157
- enlarged, as shownby tiie circle (, Fig. 1G8. Then raise the drill and examine thework. If the countersink or hole, whose circumference is indi- … Fig. 167. cated by the circle C, is exactly concentric with the outer circleBBBB, then the drill may be put down arud the hole drilled. Owing, however, to various causes, it is not often that thecircle will be concentric. This may be due to an uneven grindingof the drill, a distortion of the metal…
Mechanical engineering
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