What Is The General Rule For Finding The Proper Diameter Rivet To Use In A Repair

How to select the correct rivet size

In spite of all the advances in fastening methods, such as gluing and tightening, riveting is withal 1 of the main method used past the aircraft assembly industry and also by other lightweight construction industries where the high strength sheet metal is not weldable.

November fifteen, 2022

There are several reasons for using the riveting method, among which the low toll of installation, the lower requirements for hole preparation, high reliability, calorie-free and strong joint due to the depression weight, resistance to fatigue due to the high elasticity and durability.

A general rule is that the rivet should have a diameter of at least three times the thickness of the thickest sheet that is being joined. According to the military standard, and then the bucked counter caput bore of the rivet joint must be larger than ane.four times the diameter of the shank. The height must extend to 0.3 times the diameter of the shank. With all mentioned parameters, you tin calculate the desired length of the rivet. The assart is normally about i.5D. For example, ii pieces of 0.050 inch (1.27 mm) sheet are to be riveted together. The proper diameter rivet would be 3 x 0.050=0.150 inch (three ten one.27=3.81 mm). A 5/32" rivet (0.156 inch, three.96 mm) would be used. The metal thickness is 0.050+0.050=0.10 inch (i.27+1.27=2.54 mm), and i.5D is 0.234 inch (5.94 mm), and so the total length would take to be 0.10 + 0.234=0.334 inch (1.27+v.94=vii.21 mm) for the rivet. Meet image beneath:

In applied, for riveting such as overhaul and repair riveting, the general rule is to employ the same size and head-mode used in the next structure. This will meet all the strength requirements for the articulation.

Another topic related to the rivet is the hole preparation. After selecting the rivet size and placing the sheets, the holes must be marked for drilling. These hole-marks should be punched with a middle punch simply deep enough to start the drilling. If the punch is also hard, the mark volition be too large and the metallic will be distorted. The drill diameter depends on the type of rivet in the hole:

Notice in the table that the drill size is about three thousands of an inch larger than the rivet.

Before start drilling it is important to check the status of the drill and if the tool is properly attached in the chuck. Click here to check the condition of the drill. Later on drilling, remove the burrs from the hole without chamfering the hole edge. Sometimes the sheets tin can move or gap, in these cases you must apply pare pins or clamps because they will forestall the two holes from interfering and keep the sheets close together when it is fourth dimension for riveting.

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