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29 Cards in this Set
- Front
- Back
- 3rd side (hint)
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The main difference between Lockbolt/Huckbolt tension and shear fasteners (other than their application) is in the |
number of locking collar grooves.
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Huckbolt fasteners and lockbolts are manufactured to the same Federal Standard. In each case, the tension-type has 4 to 5 locking grooves and the shear type has 2.
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One of the main advantages of Hi-Lok type fasteners over earlier generations is that
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they can be installed with ordinary hand tools.
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The hand tools used for the installation of Hi-Lok bolts are an open end wrench and hex key (Allen wrench).
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Alloy 2117 rivets are heat treated
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by the manufacturer and do not require heat treatment before being driven.
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The 2117-T rivet, known as the field rivet, is used more than any other for riveting aluminum alloy structures. The field rivet is in wide demand because it is ready for use as recieved, and needs no further heat treating or annealing.
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The markings on the head of a Dzus fastener identify the
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body diameter, type of head, and length of the fastener.
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When working with Dzus fasteners, it is worthwhile to know that the body diameter, length, and head type may be identified by the markings found on the head of the stud.
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The Dzus turnlock fastener consists of a stud, grommet, and receptacle. The stud length is measured in
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hundredths of an inch.
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The length of a Dzus fastener is measured in hundredths of an inch and is the distance from the head of the stud to the bottom of the spring hole.
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The Dzus turnlock fastener consists of a stud, grommet, and receptacle. The stud diameter is measured in
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sixteenths of an inch.
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The diameter of a Dzus fastener is always measured in sixteenths of an inch.
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Threaded rivets (Rivnuts) are commonly used to
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attach parts or components with screws to sheet metal.
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Rivnut fasteners are a combination of rivet and nut. A hole is drilled through the skin, and the fastener, which resembles a hollow rivet with threads inside its shank, is slipped into the hole and upset with a special puller.
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Cherrymax and Olympic-Lok rivets
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utilize a pulling tool for installation.
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Both CherryMAX and OLYMPIC-LOK rivets require special pulling type tools for installation.
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Select the alternative which best describes the function of the flute section of a twist drill.
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Prevents overheating of the drill point.
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The flutes are the valley between the lands. They provide a method for cooling oil to reach the cutting edges or lips.
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What should be the included angle of a twist drill for soft metals?
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90 degrees
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An included angle of 90 degrees should be used for drilling soft metals such as lead, copper, or very soft aluminum and other soft materials such as plastic.
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When comparing the machining techniques for stainless steel sheet material to those for aluminum alloy sheet, it is normally considered good practice to drill the stainless steel at a
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lower speed with more pressure applied to the drill.
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When drilling hard metals such as titanium or stainless steel, the included angle should be 140 degrees and the operator should use a slower drill speed and a higher pressure on the bit then would be used for aluminum or steel.
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When drilling stainless steel, the drill used should have an included angle of
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140 degrees and turn at a low speed.
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When drilling hard metals such as titanium or stainless steel, the included angle should be 140 degrees and the operator should use a slower drill speed and a higher pressure on the bit then would be used for aluminum or steel.
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Which is correct concerning the use of a file?
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Apply pressure on the forward stroke, only, except when filing very soft metals such as lead or aluminum.
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Files which have one row of teeth are known as "single-cut" and those with two rows of teeth as "double-cut." The coarseness of the teeth are rated from course to fine: Coarse cut, bastard cut, second cut, smooth cut, and dead smooth cut. Generally speaking, double cut files are used for removing the most material. When cutting with the file, one should apply pressure only on the forward cut, unless the material is soft. In this case the file may be permitted to remain in contact with the material on the return to help remove chips from the teeth.
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Which procedure is correct when using a reamer to finish a drilled hole to the correct size?
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Turn the reamer only in the cutting direction.
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When a reamer is being used, it should be rotated in the cutting direction only. The reamer should be turned steadily and evenly to prevent chattering or marking and scoring of the walls.
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What should be the included angle of a twist drill for hard metal?
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118 degrees
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For most drilling, a twist drill with a cutting angle of 118 degrees will be sufficient; however, when drilling soft metals, a cutting angle of 90 degrees may be more efficient.
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Which of the rivets shown will accurately fit the conical depression made by a 100 degree countersink?
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1
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When a rivet has a 100 degree countersunk head, it has a head whose sides form a 100 degree angle. Drawing 1 shows a 260 degree angle, not including the rivet's head. This leaves 100 degree for the head of the rivet.
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The identifying marks on the heads of aluminum alloy rivets indicate the
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specific alloy used in the manufacture of the rivets.
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Markings on the heads of rivets are used to classify their characteristics. The different markings indicate the composition of the rivet stock.
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When an MS20470D rivet is installed, its full shear strength is obtained
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only after a period of age hardening.
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The "D" and "DD" series rivets are known as "icebox" rivets because they must be stored at low temperatures after heat-treating. The low temperature storage retards the naturally occurring age hardening that occurs in the 2017 and 2024 alloys following heat-treating. Within minutes after removal from refrigeration, these rivets will begin to age harden. These rivets will only achieve their full strength after the age hardening process is complete.
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What is the purpose of refrigerating 2017 and 2024 aluminum alloy rivets after heat treatment?
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To retard age hardening.
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When an aluminum alloy is heated to a specific temperature and quenched in water or in brine, it will not get hard immediately as steel does, but will gradually become hard and gain its full strength. Rivets made of an alloy such as 2017 can have their aging process retarded by storing them in a refrigerator.
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Under certain conditions, type A rivets are not used because of their
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low strength characteristics.
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the 1100 rivet, which is composed of 99.45% pure aluminum, is very soft. It is generally used for riveting non-structural parts.
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Heat treated rivets in the D and DD series that are not driven within the prescribed time after heat treatment or removal from refrigeration
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must be reheat treated before use.
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Rivets classed as "D" and "DD" become hard within a few hours of being heat treated. If this happens, they must be heat treated again before they can be used.
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The dimensions of an MS20430AD-4-8 rivet are
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1/8 inch in diameter and 1/2 inch long
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The first number following the letter (material code) indicates the diameter of the rivet in 1/32 inch increments. 4/32 = 1/8 inch diameter. The number following the dash is the length in 1/16 inch increments. 8/16 = 1/2 inch.
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Most rivets used in aircraft construction have
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dimples
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There are more rivets made of 2117 alloy than any other. These rivets are identified by a single dimple on their head.
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MS20426AD-6-5 indicates a countersunk rivet which has
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an overall length of 5/16 inch.
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The second dash number indicates the rivet's length in sixteenths of an inch.
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Which rivet may be used as received without further treatment
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2117-T3
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The reason the 2117-T rivet is so popular is that is is ready for use as received, and needs no further heat treating or annealing. It also has a high resistance to corrosion.
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A DD rivet is heat treated before use to
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soften to facilitate riveting.
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A "DD" rivet is made from 2024-T aluminum alloy. These rivets are stored in a refrigerator until used. They may be heat treated just before use to soften them, which makes the riveting easier.
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Which rivet is used for riveting magnesium alloy structures?
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5056 aluminum.
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The 5056 rivet is used for riveting magnesium alloy structures because of its corrosion resistant qualities in combination with magnesium.
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Which rivet is used for riveting nickel steel alloys?
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Monel
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Monel rivets are used for riveting nickel/steel alloys. They can be substituted for those made of corrosion-resistant steel in some cases.
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Which is the grip length of the flush rivet?
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3
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The grip length of a rivet is that portion of the rivet which is passing through the material.
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