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 158
own the side of the counteisink, on the side that isfarthest from the circle BBHB. The depth of this groove dependsupon the amount of eccentricitj- of the countersink and the deptlito wliich it has been drilled. The diill is then run down againand tlie groove drilled ojit. The action of tiiis… … the groove, as shown. The lip then catches on the edge of thegroove and cuts it away, making the hole elli[)tical, and shiftingtlie center of the drill towards its pro[ier position. As the drillsinks deeper both lips are in conttict with the faces C and D, andit has no further tendency to shift.…
Mechanical engineering
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