SQUEEZE RIVETER

Aviation Structural Mechanic (H&S) 3&2 - How airplanes are built and how to maintain them
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ONE-SHOT GUN.—The one-shot gun is designed to drive the rivet with just one blow. It is larger and heavier than other types and is generally used for heavy riveting. Each time the trigger is depressed, the gun strikes one blow. This gun is rather difficult to control on light-gauge metals. Under suitable conditions, it is the fastest method of riveting. SLOW-HITTING GUN.—The slow-hitting gun has a speed of 2,500 bpm (blows per minute). As long as the trigger is held down, the rivet set continues to strike the rivet. This gun is widely used for driving medium-sized rivets. It is easier to control than the one-shot gun. FAST-HITTING GUN.—The fast-hitting gun strikes the rivet with a number of relatively lightweight blows. It strikes between 2,500 and 5,000 bpm and is generally used with the softer rivets. Like the slow-hitting gun, it continues to strike the rivet head as long as the trigger is depressed. CORNER RIVETER.—The corner riveter is so named because it can be used in corners and in close quarters where space is restricted. The main difference between this riveter and the other types is that the set is very short and can be used in confined spaces. See figure 13-11. SQUEEZE RIVETER.—The squeeze riveter differs from the other riveters in that it forms the rivet head by means of squeezing or compressing instead of by distinct blows. Once it is adjusted for a particular type of work, it will form rivet heads of greater uniformity than the riveting guns. It is made both as a portable unit and as a stationary riveting machine. As a portable unit, it is larger than the riveting guns and can be used only for certain types of work that will fit between the jaws. The stationary, or fixed jaw, contains the set and is placed against the rivet head in driving. The rivet squeezer shown in figure 13-11 is the pneumatic type. DRILLS As is commonly known, drills are used to bore holes. In the following paragraphs, the correct use and some common errors in the usage of drills are presented. Additionally, a brief description of pneumatic and angle-drive drills is included. Portable Drills Before using a drill turn on the power and check it for trueness and vibration. Do not use a drill bit that wobbles or is slightly bent. Trueness may be visibly checked by running the motor. The most common error made by the inex- perienced person is to hold a portable drill at an incorrect angle to the work. Make sure the drill is held at right angles to the work. When you are drilling in a horizontal position, you can see if the drill is too far to the right or left, but it is difficult to tell if the rear of the drill is too high or too low. Until you Figure 13-12.—Pneumatic drills. 13-8

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