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Engineering Drawing Principles
Published in Keith L. Richards, The Engineering Design Primer, 2020
Countersinking is carried out to accommodate the heads of countersunk headed screws and rivets. The included angle is usually either 60° or 90° and provides a flush finish for the heads. Figure 2.43 shows typical details for 60° and 90° countersinks.
Drilling techniques and drilling machines
Published in Roger Timings, Engineering Fundamentals, 2007
Countersinking is mainly used for providing the recess for countersunk screws as shown in Fig. 9.10(b). Less deep countersinking is used to chamfer the sharp edges of previously drilled holes to facilitate the insertion of a bolt, to remove sharp edges and burrs that could lead to cuts, and to reduce the risk of cracking when a component has to be hardened.
Novel Capsule Fill Tube Assemblies for the Hydrodynamic Growth Radiography Targets
Published in Fusion Science and Technology, 2018
J. W. Crippen, E. L. Alfonso, N. G. Rice, C. Kong, M. McInnis, S. Felker
Recent experiments, conducted to investigate the contribution of the fill tube perturbation, predict that a 5-µm-outer-diameter fill tube will reduce the amount of injected mix during implosion compared to the standard 10-µm fill tube. This required developing new laser drilling recipes to create the necessary smaller fill tube hole. The hole shape must also meet the countersink specifications at 10 ± 5 µm at the entrance with a drill hole exit of 2 µm +2/ ̶1 µm for successful attachment and leak-free conductance.
Modeling of counter-bore and counter-sink screw lap joints
Published in Mechanics Based Design of Structures and Machines, 2022
R. Mohapatra, S. Palathingal, V. Narayanamurthy, M. Ramji
In case of countersink screw lap joint, the top plate has a conical screw hole section to accommodate the countersink screw head as shown in Figure 6. Here we observe that the stiffness of section 3 is large compared to that of section 1. So similar to the case of counter-bore plate, stiffness of section 3 can be neglected while deriving the total plate stiffness.