How to Install a Countersunk Rivet
There are many applications for a countersunk rivet. One in particular is in the building of aircraft where using countersunk rivets is extremely important for proper aerodynamics. The process of countersinking is accomplished by using a special countersink drill bit that drills a hole that widens slightly at the top. This widening allows a rivet or screw to set exactly even or below the level of the board you are screwing into.
Drilling Holes for Rivets
All holes for rivets must be center punched before being drilled out with a counter sinking bit. This will ensure that drill bit will remain steady and will not slip or jump during drilling. While drilling the holes, you must make sure that enough pressure is used to make the rivet countersunk while not countersinking it too deep. To properly countersink a rivet, the top of the rivet must be flush with the plane it is drilled into.
Another thing to consider for properly countersinking a rivet is to make sure that all the holes are completely accurate and even and that the holes them selves have been smoothed of all burrs. Burrs may be created during normal drilling. These can be taken care of using a slightly larger drill bit or a specific de-burring tool.