シャドーイング練習: Hard Fasteners - 動画で英語スピーキングを学ぶ
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a typical fastener weighs about one and three -fourths grams
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but together the 2 .5 million rivets and fasteners in a 747 weigh almost five tons that's why in the airplane industry,
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using the fastener with the right amount of strength and the least amount of weight is critical.
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Rivets are lightweight, easy to install, and inexpensive, but they don't always have the needed strength.
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And that's when you use hard fasteners.
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Hard fasteners differ from rivets in two major ways.
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They're made of titanium or steel while the rivet is usually aluminum and hard fasteners have two parts a bolt
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and a nut that has to be torqued
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or swaged many hard fasteners are self -torquing meaning
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that the nut is designed to tighten to a given clamp
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up pressure some have to be torqued manually let's take a closer look starting from the top down there's the head
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the head to shank fillet the radiused area below the head
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the shank or grip the area between the head and the threads
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the transition the tapered area at the end of the shank
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and the locking mechanism usually threads
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or rings what kind of fastener is this the head has
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the manufacturer's serial number engraved on it The Part Standards Manual converts that number to a BAC number.
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The Illustrated Fastener Reference Manual tells us how to read that number and identifies the type and the material,
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the diameter, the type of coating, and the grip length.
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Hard fasteners come in shear or tension strengths.
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shear strength means the fastener is designed to withstand sideways stress
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tension strength means the fastener is designed to withstand pulling or compression stress
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tension fasteners have larger heads to distribute stress over a bigger area
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shear fasteners save weight because they require a shallower countersink and therefore thinner their structure.
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There are six main types of hard fasteners used at Boeing.
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Lock bolts, high locks and highlights,
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eddy bolts, radius lead -in bolts,
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external wrenching bolts, and recess drive bolts.
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Let's take a look at lock bolts and how they work.
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Lock bolts are self -torquing fasteners.
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When used on primary structure, they're usually made of titanium, sometimes steel.
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Lock bolts are easy to install.
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They're often used in open areas as the lock bolt puller is bulky and therefore difficult to use in less accessible areas.
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Lock bolts come in standard weight and lightweight, the difference being a shorter transition on the lightweight.
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The lightweight can be identified by the yellow color coating on the tip.
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The standard lock bolts come in shear and tension strengths, whereas the lightweight only come in a shear strength.
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At first glance, a lock bolt looks like a threaded bolt, but What appear to be threads are actually rings.
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Tension lock bolts use more rings than shear lock bolts to give the aluminum collar more gripping surface.
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Here's how the lock bolt works.
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The lock bolt is inserted and a collar is slipped over the pin.
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The lock bolt puller grips the pin and pulls on it.
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As it pulls, the tool anvil swages the collar into the locking grooves.
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The tool continues to pull and the pin breaks off.
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Because the lock bolt has rings and not threads, the lock is very strong.
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The collar cannot vibrate off as is possible with a threaded bolt.
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HiLocks and HiLights use self -torquing nuts or collars.
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They can often be used interchangeably with lock bolts.
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They cannot be installed as quickly as lock bolts, but can be used in less accessible areas.
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HiLocks come in a variety of sizes and in standard and lightweight.
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The lightweight versions are called highlights.
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They can be identified by the orange color coding on the tip.
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Like the lightweight lock bolt, the highlight has a shortened transition.
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The shortened bolt then requires a shorter collar.
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To give you an idea of how much weight the highlights save,
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On the 747 -400, using these fasteners instead of Hilux saves over 1 ,000 pounds.
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Here's how a highlight works.
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The bolt is inserted and the collar is started.
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The tool has an alum wrench that keeps the bolt from spinning while the collar is threaded.
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The hex portion of the collar automatically breaks off when the correct torque is reached.
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If the bolts are difficult to access, then the collar won't work, and a self -locking steel nut must be installed manually with a certified torquing tool.
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Eddy bolts are also self -torquing fasteners.
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They're often used in work with composites because they use titanium collars.
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Aluminum collars can cause corrosion on graphite composites.
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Eddy bolts come in sheer and tension strengths.
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All Eddy bolts have the shortened transition for weight savings.
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An Eddy bolt has five grooves, or flutes, equally spaced around the threads.
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The nut has three equally spaced lobes.
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the bolt is inserted and the nut threaded.
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Torque is applied and at the correct clamp -up pressure, the lobes on the nut compress into at least one of the flutes in the threads.
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The eddy bolt lock is very strong and cannot vibrate off.
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Radius lead -in bolts are used primarily in the wings.
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They have tighter tolerances and generally make a stronger installation.
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Two types of radius lead -in bolts are the WQ and the WR.
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The WQ is countersunk so that the head is aerodynamically flush the WR has a protruding head.
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Here's how they work.
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The bolt is driven into the hole with a rivet gun and the nut is torqued.
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In most applications, radius lead -in bolts are designed to co -work the hole.
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The bolt compresses the material inside the hole, making it stronger structurally.
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Radius lead -in bolts are used in high -stress areas and provide a high -fatigue life.
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External wrenching and recess drive bolts are probably the most familiar fasteners.
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Many are just like bolts you find at the hardware store.
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The main difference between these fasteners and all others is that they are not self -torquing.
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Common types of external wrenching bolts include hex head, 12 -point, T -head, and wing head.
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Some come drilled for use with lock wire or cotter pins.
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External wrenching bolts can be torqued from both the head side and the nut side.
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Common types of recess drive bolts include high torque, hex socket, torque set, and Phillips.
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Recess drive bolts are normally torqued from the head side into a nut plate.
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One advantage of using external wrenching and recess drive bolts is that they can be removed and reinstalled if need be.
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Hard fasteners often require the use of washers for grip adjustment, damage protection, corrosion prevention and fillet relief.
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All hard fasteners have fillet relief requirements.
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Remember the head -to -shank fillet?
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The radius prevents the fastener from seating properly.
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The hole must be chamfered to accommodate the fillet.
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Now the fastener will seat properly.
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A washer can be used instead of chamfering, but because of weight savings, chamfering is preferred.
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Your work with hard fasteners can be checked with various types of gauges.
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They are color -coded for the different types of fasteners.
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What the gauge does is measure pin protrusion to tell you whether or not you have the proper grip -link fastener.
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Two and a half million rivets and fasteners, each with a specialized function, strength, and weight.
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Each a critical part of the airplanes we build.
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We'll be right back.
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We'll be right back.
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Oh, oh, oh, oh.
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この動画は誰におすすめ？
英語スピーキング練習をしている中級者向けです。技術的な内容を理解しながら、専門用語の発音や長文のリズムを覚えたい人に最適です。shadowing practice（シャドーイング）によって、正確な発音と自然なスピードを身につけることができます。
覚えておきたい単語と表現
- fastener：留め具。飛行機の部品などを固定するもの。
- torque：トルク。ねじを締める力のこと。
- swage：スエージ加工。金属を圧力で変形させる加工法。
- shear strength：せん断強度。横方向の力に耐える強さ。
- tension strength：引張強度。引っ張る力に耐える強さ。
アクセントを正しくするコツ
この動画のスピーカーは技術用語をはっきりと発音しています。特に「rivet」（リベット）や「titanium」（チタン）のような長い単語は、アクセントの位置を間違えやすいので注意しましょう。「rivet」は最初の音節にアクセントがあり、「titanium」は2番目の音節にアクセントがあります。また、「lock bolt」のような複合語は、2つの単語を自然につなげて発音することが重要です。shadowing siteで繰り返し練習し、リズムを覚えましょう。
さらに、「the difference being a shorter transition」のような長文の場合、文中の休止を適切に入れることで、聞き手に伝わりやすくなります。スピーカーの発音を真似て、息継ぎのタイミングを練習しましょう。これらのポイントを押さえることで、英語のスピーキング力が急速に向上します！
シャドーイングとは？英語上達に効果的な理由
シャドーイング（Shadowing）は、もともとプロの通訳者養成プログラムで開発された言語学習法で、多言語習得者として知られるDr. Alexander Arguelles によって広く普及されました。方法はシンプルですが非常に効果的：ネイティブスピーカーの英語を聞きながら、1〜2秒の遅延で声に出してすぐに繰り返す——まるで「影（shadow）」のように話者を追いかけます。文法ドリルや受動的なリスニングと異なり、シャドーイングは脳と口の筋肉が同時にリアルタイムで英語を処理・再現することを強制します。研究により、発音精度、抑揚、リズム、連音、リスニング力、そして会話の流暢さが大幅に向上することが確認されています。IELTSスピーキング対策や自然な英語コミュニケーションを目指す方に特におすすめです。