Pratique du Shadowing: PCB Assembly: Low Volume vs. High Volume - Apprendre l'anglais à l'oral avec la vidéo
Création de la leçon...
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One of the first questions to ask when evaluating a PCB assembly contract manufacturer is can they handle the expected production volume?
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To answer that, we first have to understand what we mean by low, mid, and high volumes.
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For this video, we'll leave aside very high -volume consumer electronics,
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and consider more typical volumes done by US -based contract manufacturers like Z -Axis.
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Buyers of SMT printed circuit boards often consider volume in terms of boards per year, but that doesn't tell us what we need to know.
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A contract manufacturer thinks in terms of numbers of parts to be placed.
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This is
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because the speed of the SMT pick -and -place machines is
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generally the limiting factor in how fast a job can be completed.
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Consider this example.
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For this job, we need to produce 50 boards.
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For this job, we need to produce 1 ,000.
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Which is higher volume?
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This board has 1 ,800 parts, so that's a total of 90 ,000 parts in the job.
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This one has 40 parts per board for a total of 40 ,000 parts.
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We'd consider it to be a lower volume job even though it's 20 times more boards.
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One reason the number of boards doesn't give you the true picture of volume is panelization.
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For most PCB assemblies, the layout designer fits multiple boards in an array on a single substrate or panel.
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The entire panel is populated at once, and then depaneled into individual boards.
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So to produce 10 ,000 small boards, which sounds like a lot, we may need just 100 panels.
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But again, what really matters is the total number of parts in the job job.
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Now that we have a better understanding of volume, let's look at what a contract manufacturer needs in order to do low, mid, and high volumes in one factory.
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First, you need SMT lines designed for both speed and flexibility.
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These machines pick and place up to 45 ,000 parts per hour to complete high volume jobs fast, and are designed for fast changeover between jobs,
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so you can do many different lower volume jobs in a week.
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A contract manufacturer may also have a semi -automated line for lower -volume jobs, as well as new products.
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For work other than SMT assembly, we may use manual processes for low volumes and switch to robotic systems for higher volumes.
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For example, this robotic dispensing system for box builds.
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For IC programming, we can process a low volume by hand or use a robotic system for higher volumes.
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For through -hole PCB assembly and some mixed technology boards, the wave solder can handle any volume.
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For mixed technology boards that can't be wave soldered, we can do hand soldering for low volumes or robotic soldering for higher volumes.
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Visit our website to learn more about contract manufacturing of low, mid, or high volume electronic products in the USA.
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Vocabulaire et conseils d’expression pour cette leçon
Cette leçon d’expression orale s’appuie sur la vidéo « PCB Assembly: Low Volume vs. High Volume ». Les mots qui reviennent le plus souvent : volume, board, parts, contract, manufacturer. Cette vidéo contient 32 phrases et 471 mots à répéter en shadowing. La partie parlée dure 3:00. Le locuteur parle à un rythme naturel d’environ 157 mots par minute, proche d’une conversation courante. 82 % des mots font partie des 3 000 mots les plus courants en anglais ; le reste mérite d’être vu avant de commencer.
Vocabulaire clé de cette vidéo
15 mots de la vidéo à retenir, avec leur prononciation et leur sens :
| Mot | Prononciation | Sens |
|---|---|---|
| manufacturer nom | /ˌmænjʊˈfæktʃəɹə/ | fabricant, fabricante |
| robotic adjectif | /ɹoʊˈbɑtɪk/ | robotique |
| designer nom | /dɪˈzaɪnɚ/ | designer, styliste |
| manual nom | /ˈmæn.j(u)əl/ | manuel |
| electronics nom | /ɪˌlɛkˈtɹɑ.nɪks/ | électronique |
| array nom | /əˈɹeɪ/ | éventail |
| layout nom | /ˈleɪ.aʊt/ | disposition, schéma |
| buyer nom | /ˈbaɪ.əɹ/ | acheteur, acheteuse |
| flexibility nom | /ˌflɛksɪˈbɪlɪti/ | souplesse, flexibilité |
| evaluate verbe | /ɪˈvaljʊeɪt/ | évaluer |
| substrate nom | /ˈsʌbˌstɹeɪt/ | substrat |
| solder nom | /ˈsɒl.də(ɹ)/ | soudure |
| automate verbe | /ˈɔ.təˌmeɪt/ | automatiser |
| changeover nom | changement, passage | |
| dispense verbe | /dɪˈspɛns/ | émettre, distribuer |
Prononciation à surveiller
Le locuteur utilise 5 contractions et formes réduites, comme doesn't, can't, we'd. Prononcez-les sous leur forme courte, telles que vous les entendez.
- Mots longs — placez bien l’accent: manufacturer /ˌmænjʊˈfæktʃəɹə/, electronics /ɪˌlɛkˈtɹɑ.nɪks/, flexibility /ˌflɛksɪˈbɪlɪti/
Les sons difficiles pour les francophones :
- /r/ anglais — langue recourbée, sans frotter la gorge: manufacturer /ˌmænjʊˈfæktʃəɹə/, robotic /ɹoʊˈbɑtɪk/, electronics /ɪˌlɛkˈtɹɑ.nɪks/, array /əˈɹeɪ/, buyer /ˈbaɪ.əɹ/
Comment s’entraîner avec cette vidéo
- Écoutez la vidéo en entier une fois sans parler et notez les mots que vous ne connaissez pas.
- Commencez à la vitesse 0,75×, répétez phrase par phrase, puis revenez à la vitesse normale quand cela devient facile.
- Enregistrez-vous et comparez avec l’original, en faisant attention à des mots comme manufacturer, robotic, designer.
Qu'est-ce que la technique du Shadowing ?
Le Shadowing est une technique d'apprentissage des langues fondée sur la science, développée à l'origine pour la formation des interprètes professionnels. Le principe est simple mais puissant : vous écoutez de l'anglais natif et le répétez immédiatement à voix haute — comme une ombre suivant le locuteur avec un décalage de 1 à 2 secondes. Les recherches montrent une amélioration significative de la précision de la prononciation, de l'intonation, du rythme, des liaisons, de la compréhension orale et de la fluidité.